Do PPL program input parameters accept symbolic arguments?

[Helge Gabert]

In a PPL program (Home environment), is it possible to pass from the command line a symbolic argument to the program?

For example, run MYPROGPPL(k1,k2,k3). Here k3 should contain 'X' or 'X^2' or something like that (defined by the user at program start).

Then, for example, integration could work with \int (from the template) like \int(k3,'X',k1,k2);

This is all no problem with a CAS program,

e.g., MYPROGCAS(k1,k2,k3) with k3 containing 'x^2' can run int(k3,'x',k1,k2); just fine,

but I'm running into problems with PPL and symbolic arguments.

[Han]

Would you care to share a few code snippets? I think seeing what it is you want to do would make it easier to make suggestions.

Code:


MYINT(v1,v2,v3,v4)
BEGIN
int(QUOTE(v1),QUOTE(v2),v3,v4);
END;

The code above works just fine. What you must always keep in mind, though, is that this program behaves differently in Home vs in CAS. In Home, you can use MYINT('X','X',1,2) and get the right answer. However, in CAS, the 'X' are treated as constants (as opposed to 'x', provided you also did not store any values into x).

In sum, MYINT() is placed under the same restrictions as built-in commands.

[Helge Gabert]

Sure, here is the snippet

   


So, ideally, the user could call PU(1,2, 'N^3'). And next time, the user could call PU(1,4, 'N^2+N') and so on.

[Helge Gabert]

Thank you! That does work!

So QUOTE() does the trick, and you don't even have to call CAS.int() or CAS("int()"). Amazing (although you can't debug).