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PLOTTER INSTRUCTIONS
PLOTTER is a data plotting and evaluation program that can be run
on any PC/AT compatible computer with at least 640K bytes of RAM and
a standard CGA, EGA or VGA color monitor. Both Epson compatible and
HP LaserJet compatible printers are supported for hard copy. Screen
images of EGA and VGA plots can be saved to disk in PCX format for
importing to word processors. If a MOUSE is detected in the system,
it is automatically supported.
If you want PLOTTER to load a data file at start-up time, you can
type PLOTTER FILENAME at the DOS prompt. The file will be read
as DATA FILE TYPE #1, and the program will start at the Options
Menu (see below). The DOS command line option makes it possible to
call PLOTTER from inside your own programs. For example, in BASIC
you would include the program line: SHELL "PLOTTER FILENAME".
In general, default input responses are indicated by an asterisk
(*). Inputs that require key strokes not followed by RETURN are
indicated by square brackets []. Inputs that require RETURN to
complete the entry are indicated by parentheses (). You can back
out of most prompts in the program by pressing the ESCAPE key.
The use of the MOUSE is intuitive throughout the program. Place
the MOUSE CURSOR on the item to be selected and click the LEFT
BUTTON. In general, the LEFT BUTTON is treated as a RETURN key
press, and the RIGHT BUTTON is treated as an ESCAPE key press.
You can use the MOUSE to answer single key prompts, such as [Y/*N]
or F2=LABEL, but most program inputs require use of the keyboard.
For the menus in PLOTTER, you can use the UP and DOWN ARROW keys
to scroll through the items and press RETURN for your selection.
Or you can press the highlighted "hot key." To use your MOUSE,
place the CURSOR on the desired item and click the LEFT BUTTON.
When you start PLOTTER you will see the Main Menu, consisting of
the following selections:
(R)ead Data File from Disk
Create or (E)dit Data Files
Change Plotter (S)etup
(I)nstructions for Plotter
Shell to D(O)S Environment
(Q)uit the Program
Press the (O) key to shell to DOS, and enter "exit" to return to
PLOTTER. Press (Q), ESCAPE, or the RIGHT MOUSE BUTTON to quit.
Pressing (I) will let you read through the instructions for PLOTTER
contained in the ASCII text file PLOTTER.DOC (which is the document
you are presently reading). Use the UP and DOWN ARROW or PAGE keys
to move through the document. Place the MOUSE CURSOR on the top or
bottom border lines and click the LEFT BUTTON to scroll up or down
one line, or place the MOUSE CURSOR on the ARROW ICONS and click the
LEFT BUTTON to move up or down one page. The (I)nstructions feature
requires PLOTTER.DOC to be in the default directory.
(R)ead Data File from Disk
Use this option to read your data file(s) into PLOTTER. The program
can plot up to a total of 60,000 data values (for example, 30000 X-Y
pairs in one data set). The path and file name(s) you enter will
become the default(s) for the current session of PLOTTER. The (R)ead
option prompts depend on which DATA FILE TYPE you have selected in
the (S)etup option. The default is DATA FILE TYPE #1.
DATA FILE TYPE #1: You will be asked to "Enter the FILE NAME of your
DATA SET." Press ESCAPE, or click the RIGHT MOUSE BUTTON, to cancel
the (R)ead option. The number of columns in your data file, and the
length of the file, will be automatically determined as the data is
read. The program will then take you to the Options Menu (see below).
DATA FILE TYPE #2: The first prompt is "Select NUMBER OF DATA FILES
to read:[ *1-9 ]." PLOTTER can read up to 9 separate data files,
each with different numbers of points and different X axis values.
You can press ESCAPE at this point to return to the Main Menu. You
are then asked to "Enter the FILE NAME of DATA SET # " for the
number of files you have selected. Press ESCAPE, or click the RIGHT
MOUSE BUTTON, to cancel and return to the Main Menu. When you are
done, the program will take you to the Options Menu (see below).
Create or (E)dit Data Files
Use this option to manually create or edit small data files. You
will first be asked to "Enter the FILE name for your DATA SET."
Press ESCAPE, or the RIGHT MOUSE BUTTON, to cancel. If the requested
file does not exist, you will be asked if you want to create it. You
are then presented with the data editing screen.
Use the MOUSE CURSOR to position the editing cursor, scroll the data
screen (by clicking on the ARROW ICONS or the BORDER LINES) and select
options from the bottom status bar. The editing keys are as follows:
ARROW KEYS .......... MOVE CURSOR OR SCROLL DATA
PAGE UP/DN .......... PREVIOUS/NEXT SCREEN
HOME/END ............ START/END OF A LINE
CTRL-HOME/END ....... START/END OF THE FILE
INSERT .............. TOGGLE INSERT/TYPEOVER
ENTER ............... START A NEW LINE
TAB ................. INSERT OR TYPEOVER 5 SPACES
DEL/BACKSPACE ....... DELETE DATA AND LINES
CTRL-Y .............. CUT CURRENT LINE INTO BUFFER
SHIFT-INS ........... PASTE SINGLE LINE FROM BUFFER
CTRL-X .............. SORT DATA BY X AXIS VALUES
ESCAPE .............. SAVE FILE AND OPTIONALLY QUIT
Enter your data according to the format shown below in the des-
cription of the Change Plotter (S)etup option. The data on each line
must be separated by AT LEAST ONE SPACE. Note that PLOTTER cannot
use more than 10 columns of data, and that the maximum file length
is about 1200 lines. Make sure that your data is entered correctly.
For example, DO NOT include commas or non-numerical characters.
Press ESCAPE, or click the RIGHT MOUSE BUTTON, to the quit editor.
You will then have the chance to save any changes you have made.
Finally, the program takes you to the Options Menu (see below).
Change Plotter (S)etup
Use this option to change the default settings in PLOTTER. The new
settings will remain in effect while the current session of PLOTTER
is running. The first prompt is "Select DATA FILE TYPE to read:"
PLOTTER can read two different file formats, as shown below. The
program initially defaults to DATA FILE TYPE #1. Note that all data
files must have the data separated by AT LEAST ONE SPACE.
DATA FILE TYPE #1: Plot up to 10 columns of data from one file.
X1 Y11 Y12 .. Y1m Data columns have a common X axis and
X2 Y21 Y22 .. Y2m the same number of points. You can
: : : .. : redefine the X axis column. Max size
Xn Yn1 Yn2 .. Ynm for the data is 60,000 real values.
DATA FILE TYPE #2: Plot up to 9 separate data files.
X1 Y1
X2 Y2 Data sets can have different X axis values and numbers
: : of points. Max data size for ALL sets is 60,000 values.
Xn Yn
The next prompt is "Select [X]-Y or [S]EMI-LOG plot:" PLOTTER de-
faults to X-Y plots. Press [S] to plot the X axis values as BASE
10 LOGARITHMS. Semi-Log plots are useful for data whose X axis
values span a range from small decimals to large whole numbers.
Note that PLOTTER automatically reverts to the default X-Y plot
type when you select the Curve Fitting or Signal Processing Menus.
The third prompt is "Show GRID LINES on plots?" You will auto-
matically get dashed grid lines on your plots indicating the
axis divisions. Press [N]o to get tick marks instead of lines.
The final prompt is "Select maximum FFT size:" The (S)etup module
asks for the maximum FFT size, with the default being AUTO. Legal
FFT sizes for PLOTTER are integer powers of two: (256, 512, 1024,
2048, 4096, 8192, 16384). Entering the word AUTO causes the program
to select the largest FFT size that can fit your data size.
After you have loaded your data, the Options Menu is presented:
(P)lot the Data Only
(S)ignal Processing Menu
(C)urve Fitting Menu
Return to (M)ain Menu
Press (M), ESCAPE, or click the RIGHT MOUSE BUTTON, to return to
the Main Menu. You can also press ESCAPE in answer to any prompt
described below to return to the Options Menu. NOTE: If you have a
data file already loaded, and you Return to (M)ain Menu to review
the (I)nstructions or change the (S)etup, you will be returned to
the Options Menu so you can continue evaluating your data.
(P)lot the Data Only
Use this option to plot your raw data. The option has slightly
different prompts for each DATA FILE TYPE.
DATA FILE TYPE #1: You are first asked "Which COLUMN of DATA is the
X AXIS?" The default selection is column 1. If you choose a different
column, then all the curves will be plotted using that column as the
common X axis. This is done by SWAPPING the current X axis column with
the selected column while the plot is made. It is your responsibility
to know the structure of your data so that you end up plotting the
curves that you want. If your data file contains more than 2 columns
(X and Y), then you are asked "How many CURVES do you want to PLOT?"
The default is the total number of curves that were detected in your
data file. If you select less than the default number you are asked
"PLOT which CURVE(S)?" Enter the column numbers you want to plot.
DATA FILE TYPE #2: If you have read more than one data set, you are
first asked "How many CURVES do you want to PLOT?" The default is
the number of data files you have read. If you select less than the
default number then you are asked "PLOT which CURVE(S)?" Enter the
numbers of the data sets you want to plot. Recall that for this DATA
FILE TYPE each curve can have a different X axis.
You are then asked if the plot should "SHOW original DATA points?"
The default answer is [N]o. If you select [Y]es then small symbols
will be plotted indicating your original data. PLOTTER will pause
after showing the data points. Press ESCAPE, or the RIGHT MOUSE
BUTTON, to leave the points unconnected. Press ANY OTHER KEY, or the
LEFT MOUSE BUTTON, to connect the points with lines.
If you are plotting just two curves, you will be asked "Do you want
a DUAL PLOT?" The default answer is [N]o. Selecting [Y]es will plot
the first curve on the upper half of the screen and the second curve
on the lower half of the screen. Press RETURN to continue plotting
your selected curves. After the last curve has been plotted, press
ESCAPE to return to the Options Menu. See the PLOTTING OPTIONS below
for details of the features available during plotting.
The Signal Processing Menu consists of the following options:
Calculate (F)FT of the Data
(D)igitally Filter the Data
Return to (O)ptions Menu
Press (O), ESCAPE, or click the RIGHT MOUSE BUTTON, to return to
the Options Menu. You can also press ESCAPE in answer to any of
the prompts below to return to the Signal Processing Menu.
Calculate (F)FT of the Data
PLOTTER has a valuable feature that lets you evaluate the frequency
content of time domain data, for example from a data acquisition
system, using the Fast Fourier Transform (FFT). At least 256 data
values are required. Also, the X axis time data must be all positive,
and must have a constant time step. Due to the numerical processing
required, the maximum FFT size for data files containing more than
20,000 pairs is 8192 points.
If you have read more than one data set, you are asked "FFT which
DATA SET?" The default is set #1. If the size of your data set
is EXACTLY the size of a legal FFT window (256, 512, 1024, 2048,
4096, 8192 or 16384 points), then the program will prompt "Select
HANNING, FLAT TOP or RECTANGULAR window: [H/F/*R]" (see below).
If the amount of data is not an even FFT size, you will be asked to
"Select START of TIME WINDOW for NMAX point FFT," where NMAX is the
currently selected FFT size. PLOTTER will automatically select the
largest FFT that will fit your data set, unless you have specified
the FFT size in the (S)etup module. This prompt lets you tell the
program where in your data set to locate the NMAX number of points
that will be sent to the FFT subroutine.
The final prompt is "Select HANNING, FLAT TOP or RECTANGULAR window:
[H/F/*R]." The default answer is [R]ectangular, which is the same as
applying no window. The [H]anning window is used for identifying
closely spaced frequency components in the spectrum. The [F]lat Top
window produces magnitudes in the spectrum that more accurately
show the amplitudes of the components in the original time domain
data. Consult a text on Digital Signal Processing for details.
The time domain data is plotted on the upper half of the screen. Note
that the F6=MATH option can be used to SMOOTH or SCALE the data in the
window before computing the FFT (the original full data set is not
affected). Press Q to quit without an FFT. Press RETURN to compute the
FFT. The frequency spectrum is then plotted on the lower half of the
screen. The PLOTTING OPTIONS are again available. Press ESCAPE, or
click the RIGHT MOUSE BUTTON, to quit the plot.
Before you are returned to the Signal Processing Menu, you are
asked if you want to "Save FREQUENCY and MAGNITUDE values to disk?"
This allows you to store the spectrum that has just been computed.
The default answer is [N]o. If you select [Y]es, you will be asked
to "Enter a NAME for your FREQUENCY FILE." Press ESCAPE, or the
RIGHT MOUSE BUTTON, to cancel the file save option.
(D)igitally Filter the Data
This feature lets you apply a LOW PASS, HIGH PASS or NOTCH filter
to your data set(s). Consult a text on Digital Signal Processing for
details. At least 256 data values are required for filtering. Also,
the X axis time data must be all positive and must have a constant
time step. Due to the numerical processing required, a maximum of
20000 Y axis data values can be filtered. If you have read more than
one data set, you are asked "FILTER which DATA SET?" The default is
set #1. The Filter Design Screen then appears.
The first prompt is "Select LOW PASS, HIGH PASS or NOTCH FILTER:
[L/H/*N]." The default is a [N]OTCH filter, which can be used to
remove specific frequencies from your data.
If you select a NOTCH filter, you will be asked to "Enter CENTER
FREQUENCY for the FILTER: (0 to FMAX Hz)" where FMAX is one half
of the sampling frequency detected in your data. This value is the
center of the frequency range where the filter will operate. You are
then asked to "Enter BANDWIDTH for the FILTER: (FRQ Hz)" where an
arbitrary default value, FRQ, is offered. This value defines the
frequency range over which the filter will operate. The NOTCH filter
is a 2nd order INFINITE IMPULSE RESPONSE (IIR) filter.
For a LOW or HIGH PASS filter, you are asked to "Enter CUTOFF
FREQUENCY for the FILTER: (0 to FMAX Hz)." This value determines
the range of frequencies to be passed. The next prompt is "Enter
the ORDER of the FILTER: (50)." This value determines the "rolloff"
characteristics of the filter. The PASS-type filters in PLOTTER are
FINITE IMPULSE RESPONSE (FIR) filters, and use a VON HANN window to
compensate for amplitude loss. Note that your data can be filtered
multiple times (allowing you to create, for example, a BAND PASS
filter effect). However, be aware that LOW PASS digital filtering
will NOT remove any ALIAS signals that are already in the data.
After some processing time, you are presented with a frequency plot
showing the attenuation (in dB) of your filter. This lets you verify
that the filter will perform as expected. Press Q to quit without
implementing the filter, and return to the Signal Processing Menu.
Press ESCAPE to continue. After more processing, the filtered data
is plotted on the upper half of the screen. To let you evaluate the
spectrum of the filtered data, an FFT is computed from the first NMAX
points, where NMAX is the largest FFT size that can be fitted to the
data. Press Q to quit without the FFT. Press RETURN to calculate the
FFT and display the spectrum on the lower half of the screen. The
PLOTTING OPTIONS are available for evaluating the plots.
Before you are returned to the Signal Processing Menu, you are
asked if you want to "Save TIME and FILTERED DATA values to disk?"
The default answer is [N]o. If you select [Y]es, you will be asked
to "Enter a NAME for the FILTERED DATA FILE." Press ESCAPE, or click
the RIGHT MOUSE BUTTON, to cancel the file save option.
The Curve Fitting Menu consists of the following options:
(C)ubic Spline Curve Fit
(P)olynomial Curve Fit
(A)utomatic Curve Fit
Return to (O)ptions Menu
Press (O), ESCAPE, or click the RIGHT MOUSE BUTTON, to return to
the Options Menu. You can also press ESCAPE in answer to any of
the prompts below to return to the Curve Fitting Menu.
If you have read more than one data set, you are first asked "How
many CURVES do you want to FIT?" The default is the number of data
sets you have read. If you enter less than the default number,
you are asked "FIT which CURVE(S)?" You are then asked if the plot
should "SHOW original DATA points?" The default answer is [N]o. If
you select [Y]es then small symbols will be plotted indicating your
original data. PLOTTER will pause after showing the data points.
Press ESCAPE, or the RIGHT MOUSE BUTTON, to leave the points
unconnected. Press ANY OTHER KEY, or the LEFT MOUSE BUTTON, to
connect the points with the curve fit.
If you have selected JUST ONE DATA SET for curve fitting, after the
plot of the curve fit has been presented you will be asked if you
want to "Save X and Y CURVE FIT values to disk?" The default answer
is [N]o. If you select [Y]es, you will be asked to "Enter a NAME for
the CURVE FIT DATA FILE." Press ESCAPE, or click the RIGHT MOUSE
BUTTON, to cancel the file save and return to the Curve Fitting Menu.
(C)ubic Spline Curve Fit
This option will perform a CUBIC SPLINE curve fit of your data
set(s). The cubic splines will always pass through your original
data points. The most data that can be handled is 1000 points for
a single data set, or 500 points each for multiple data sets. Press
RETURN to continue plotting your selected curves. After the last
curve has been plotted, press ESCAPE to return to the Curve Fitting
Menu. Note that for this kind of curve fit, the F6=MATH option is
not available. This is because you can modify your original data
first, and then perform the curve fit. See the PLOTTING OPTIONS
below for details of the features available during plotting.
(P)olynomial Curve Fit
This feature performs a least squares polynomial curve fit on your
data set(s). The most data that can be handled is 500 points per data
set. For each of the data sets you have selected, you will be asked
to "Enter the DEGREE for POLYNOMIAL #." Each data set can be fitted
with a different order polynomial. The legal range for the DEGREE
of each polynomial is from 1 to 19 (integer values).
You can use the F6=MATH key to view the coefficients of the poly-
nomials for each data set (see the description of the PLOTTING
OPTIONS below). Press RETURN to continue plotting your selected
curves. After the last curve has been plotted, press ESCAPE, or the
RIGHT MOUSE BUTTON, to return to the Curve Fitting Menu.
(A)utomatic Curve Fit
This option automatically selects the curve fit that best describes
your data set(s). The following three types of curves are used:
Linear: Y = A + B * X
Exponential: Y = A * EXP(B*X)
Power: Y = A * X^B
The fit that produces the highest correlation coefficient (R^2) is
selected. The most data that can be handled is 500 points per data
set. Use the F6=MATH key during plotting to view the equation and
coefficients for the curve. For each of the selected data sets, the
best curve fit will be plotted. Press RETURN to continue plotting
your curves. After the last curve has been plotted, press ESCAPE,
or the RIGHT MOUSE BUTTON, to return to the Curve Fitting Menu.
PLOTTING OPTIONS
During plotting you can press Q to QUIT the plot screen and return
IMMEDIATELY to the previous menu. If you are plotting multiple
curves, press RETURN, or click the LEFT MOUSE BUTTON, to CONTINUE
with the next plot. After the last curve has been plotted, press
ESCAPE, or click the RIGHT MOUSE BUTTON, to QUIT the plotting screen
and return to the previous menu. You can also press the ESCAPE or
Q keys while a curve is being generated to stop the plotting.
After each curve has been plotted, you will see a list of options
(F1 through F7) presented at the bottom of the screen. They can
be selected by the corresponding function key, or by positioning
the MOUSE CURSOR on the item and clicking the LEFT MOUSE BUTTON.
Each option contains a number of utilities.
F1=LIMITS: You can select the upper and lower limits, and the
number of axis divisions, for both the X and Y axes. Press RETURN
alone to retain the current value. Note that you can select the
lower limits (XLOW or YLOW) to be greater than the upper limits
(XMAX or YMAX) if you so choose. If you are plotting multiple
curves, the plots will be regenerated starting at the first curve.
F2=LABEL: This key activates one of the best features of PLOTTER.
It allows you to type ASCII text ANYWHERE on the plot screen. You
can type axis labels, plot titles, and identifying labels for your
curve(s). The cursor is originally placed above the upper left
corner of the plot. Use the ARROW keys, HOME, END, PAGE UP and PAGE
DOWN keys to move the cursor around, or you can use the MOUSE CURSOR
to position the text cursor by clicking the LEFT MOUSE BUTTON. Press
the ESCAPE key when you are done labeling. Note that the F1=LIMITS,
F3=REPLOT, F4=SINGLE and F6=MATH functions will redraw the plots and
wipe out your labels, so it's best to wait until you have the plot
just the way you like it before labeling.
F3=REPLOT: This function acts like an "oops" key. It replots the
curve(s) with the plot limits reset to the original autoscaled
values. If you are plotting multiple curves, the plots will be
regenerated starting at the first curve.
F4=SINGLE: If you are plotting multiple curves, or have a dual plot
(as in the FFT option), this key will plot the current curve on a
single plot of its own. If you are plotting a curve fit, the plot
will be autoscaled according to the maximum and minimum values in
the curve fit. Press ESCAPE to return to the multiple curve plot
(the plots will be regenerated beginning with the first curve).
F5=CURSOR: The data cursor function allows you to examine the
numerical values in your data. The X and Y data values of the
current curve are printed below the lower left corner of the plot.
The LEFT and RIGHT ARROW keys move the cursor. Press CTRL-ARROW
keys for a faster cursor. Alternatively, you can drag the data
cursor by holding down the LEFT MOUSE BUTTON and moving the MOUSE.
If the cursor is near a LOCAL MAXIMUM in the data, selecting
F1=LOCAL MAX will make the cursor jump to that maximum. If the
cursor is near a LOCAL MINIMUM in the data, selecting F2=LOCAL
MIN will make the cursor jump to that minimum. Each time you select
F3=STORE, the current data values are appended to an ASCII data
file that is automatically created in the default directory. For
DATA FILE TYPE #1, the file name is the prefix of your data file
with a ".CSR" extension. For DATA FILE TYPE #2, the file name is
"PLOT.CSR". Press ESCAPE to quit the data CURSOR option.
F6=MATH: This function provides several features. If you are
plotting (P)olynomial or (A)utomatic curve fits, you will be
shown the coefficients for the current curve (the plots will then
be regenerated beginning with the first curve). The other F6=MATH
options are not allowed for curve fits since you can modify the
data first, and then perform the curve fit. S=SMOOTH will smooth
the current data set by passing it once through a five point
approximation algorithm. Data smoothing can remove jagged peaks
often caused by signal noise. X=SCALE X AXIS and Y=SCALE Y AXIS
allow you to multiply the current data set by some scaling value.
This is especially useful for converting raw data (say volts) from
data acquisition systems to engineering units. You can also add
(or subtract) a constant offset to the data. If you are plotting
multiple curves, the plots will be regenerated starting at the
first curve. Press ESCAPE to quit the MATH option.
F7=PRINT: This function allows you to generate hard copy of your
plots, and save EGA or VGA plot screens to disk in PCX format.
Any printers capable of emulating either an EPSON dot matrix or
a HEWLETT PACKARD LaserJet are supported for hard copy. Note that
many brands of printers can automatically emulate an EPSON printer
(the IBM laser printer is an example). The printer MUST be connected
to LPT1. The default options are H=HP LASERJET and L=LANDSCAPE.
Select H=HP LASERJET or E=EPSON to choose the printer you want (be
careful, since choosing the wrong type will cause garbage to be sent
to the printer). Select L=LANDSCAPE to print your plot sideways,
using the full paper size. Select P=PORTRAIT to print the plot
straight on using half of the paper size. When you are ready, and
the printer is turned on, select G=GO to print your plot. If you
want to save an EGA or VGA plot to disk, instead of printing, press
X=PCX. Your PCX files will be saved in the default directory with
names of the form PLOT#.PCX, where # is a number that is incremented
each time you save a screen (while the current session of PLOTTER is
running). Many word processors can import PCX files as figures into
documents. The prompt line at the bottom of the screen and the MOUSE
CURSOR are automatically blanked while the plot is being sent to the
printer or to disk. Press ESCAPE to quit the PRINT option.
Q: You are not prompted for this key, but pressing Q will quit the
plot screen and return IMMEDIATELY to the previous menu. Also, you
can press Q as a curve is being generated to stop the plotting.
RET=CONTINUE: This prompt is displayed in the lower right corner
of the plot screen. When you are plotting multiple curves, press
RETURN to continue to the next plot. After the last curve has been
plotted, the RET=CONTINUE prompt is replaced with the ESCAPE=QUIT
prompt. This keeps you from accidentally pressing RETURN too many
times and quitting the plot screen before you are ready. Recall
also that the LEFT MOUSE BUTTON is treated as a RETURN key press.
ESCAPE=QUIT: This prompt is also displayed in the lower right
corner of the screen. The ESCAPE key is the principal means of
quitting each of the options described above. Press ESCAPE after
the last curve has been plotted to quit the plot screen and return
to the previous menu. Recall that, in general, the RIGHT MOUSE
BUTTON is treated as ESCAPE. Also, you can press ESCAPE when a
curve is being generated to stop the plotting.
SPACE: You can press SPACE to mask the prompt line on the bottom of
the plot screen. This is useful if you want to use screen grabbing
software to import the plots into a word processor. You can hide
the MOUSE CURSOR by moving it to the far right side of the screen.
SHAREWARE
PLOTTER is distributed as Shareware. Feel free to share the program
and its files with others. However, if you continue to use PLOTTER,
you must register the program by sending $15.00 US to:
Robert Lindsay Wells, Ph.D.
1405 Lynn Avenue
Clearwater, FL 34615
When you register, you will receive the latest version of PLOTTER,
a free instruction manual, and three months of technical support by
telephone or E-Mail. Please register today!
AND FINALLY ... THE INEVITABLE DISCLAIMER
Although all reasonable efforts have been made to ensure the
accuracy of the algorithms used in PLOTTER, the author of this
software makes no guarantee of, and takes no responsibility for,
the correctness of the plots or the data presented by PLOTTER.
Any decisions or judgements made by the user based on the plots or
data output by PLOTTER are solely the responsibility of the user.