Hi,
I try some experiments with the emulator... I'd like to write a program that asks first for a function and then place is inv-Laplace transform in F1 for plotting.
Here is the "idea" (of course it can't work like this...)
EXPORT Laplace()
BEGIN
local s,f;
INPUT(f,"F(s) definition","F(s)=", "Enter function transfer");
F1:=CAS.invlaplace(f,s,'X');
END;
Can you help me ? I have in mind to make an APP for "motion control" but as you can read It's a long way for me...
Hello,
Concider using strings for entering the function and using it in the CAS command...
F1:= CAS("ilaplace("+f+"s,'X')");
Cyrille
Thank you Cyrille for your fast answer... I followed your advice
EXPORT Laplace()
BEGIN
local s,f;
f:="1/(1+s)";
INPUT(f,"F(s) definition","F(s)=", "No help!");
F1:=CAS("invlaplace("+f+",s,'X')");
END;
But I have an error syntax...
I can place a local var u in place of F1, I can do F1:=sin('X') but
F1:=CAS("...") don't work.....
Any idea ?
Quote:
Thank you Cyrille for your fast answer... I followed your advice
EXPORT Laplace()
BEGIN
local s,f;
f:="1/(1+s)";
INPUT(f,"F(s) definition","F(s)=", "No help!");
F1:=CAS("invlaplace("+f+",s,'X')");
END;
But I have an error syntax...
I can place a local var u in place of F1, I can do F1:=sin('X') but
F1:=CAS("...") don't work.....
Any idea ?
The issue is likely that f is evaluated before it actually gets passed to CAS(). What you need to do is make sure to enter in a symbolic: '1/(1+s)' as opposed to just 1/(1+s)
You can save a tiny bit of memory by using F1 instead:
INPUT(F1,"F(s) definition","F(s)=", "No help!");
and when you enter a formula, use single quotes: [shift][()] to designate a symbolic input.
Thank you Han for your help... But I can't find a solution... Did you try a program with succes ? If so can you post the code ?
As you can see I place f in double quotes "1/(1+s)"
If you try this in CAS command line :
first command -> f:="1/(1+s)"
second command -> CAS("invlaplace("+f+",s,'X')") then it works : -> exp(-X)
But in a program I have an error syntax...
I try with single quote... No success...
I wrote a new post on the top of the stack...