plot function

Hi,
I want to plot a function like f(x) = x^2. How can I do that with autoCAD?
Thanks in advance,
Bernhard

 

How accurate does it have to be?

 

Very accurate. I also have an according truth table (value chart) with
approx. 1000 xy-coordinates which resemble the function, but I would not
like to set all these coordinates manually and join them by a polyline...
I have plotted my function with Origin as well as Excel, but I failed in
importing that data from one of those programs..

Bernhard

 

There are LISP routines for plotting such functions. They're not too
difficult to write, but you may also find some of these via a Google search.

Also, if you have a comma-delimited list of the points, it could be easily
converted to a script. For example if your list is something like this x,y
format:

0,0
0.1,0.01
0.2,0.04
....
<etc.>

you can simply prefix it with
PLINE
then end it with an extra blank line to close the pline command. Save it
with a .scr extension, and run it in AutoCAD.
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Depend on who you ask, a polyline connecting a bunch of accurate points is
NOT that accurate, i.e. perfect.
Like Paul said, a script will do it if a polyline is "accurate" enough.

 

.... and splining the pline makes it a bit more accurate.

 

Sorry ... Actually, that should be "curve fitting" ... splining may pull the
result off of the plotted points.
____

 

I use Excel to create these kinds of scripts because you can import comma
delimited source data into columns and then insert the necessary columns
(commands, semi-colons, etc.) and then export the data back to comma
delimited. Some pre-planning while working in Excel will lend itself to
search and replace once the data is sent back out and opened in Word for
example. As in replacing the commas in the CDF file or tabs in a tab
delimited file with AutoCAD's return character, the semi-colon.

 

What kind of work are you doing?

 

Thanks for your help,
now I have generated an ASCII file with .scr suffix that looks like this:

_pline
0.00273,0.00747
0.00636,0.00744
0.01,0.00742
0.01364,0.0074
0.01727,0.00738
0.02091,0.00735
0.02455,0.00733
0.02818,0.00731
0.03182,0.00728
0.03545,0.00726
0.03909,0.00723
0.04273,0.00721
0.04636,0.00719
0.05,0.00716


Note that I had to use an underscore "_pline" instead of "pline" in order to
make the script work. However, AutoCAD demands a 2D starting point now.. How
do I specify this?

When I do not use the script file but type in the commands directly in the
command line, I have to specify each next plot-point manually, it seems not
to be able to paste a row of points there?

Thanks again,
Bernhard

 

Your script should work as shown; 0.00273,0.00747 *is* your first 2D point.
Be sure there are no extra spaces at the end of any of the lines. Also
"_.pline" is the programmer preferred format, since it ensures that the
"native" form of the pline command is used, even if it has been redefined.
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