Wronskian

[salvomic]

(02-23-2015 10:24 PM)Han Wrote:  Try this:
...
Usage: wronskm([f1,f2,...,fn]) returns the matrix; wronsk([f1,f2,...,fn]) returns the determinant of the matrix

The error message regarding single-variable functions can occur when:
1) the "variable" already exists and contains a value of some sort (e.g. exported from a non-CAS program, defined by user, or exists in the CAS view); OR
2) the functions in the vector of functions are multivariate (or are all constants)

thanks a lot!
this works well, and finally the controls are what I would have to get!

Please, can you tell me the use of the $ sign in diff() function?
Another think: wronsk(f) take also the IF in the other function, as I can see, is it right?
IF TYPE(s) THEN ... after the control of s==0 and <>6: controls it if there is another value for s?

You prefer two CAS function and it's ok also for me; another idea is to have only a command and a Choose routine, as in the my previous version...
Ad libitum

Salvo

EDIT: variables r, c: shouldn't they be in local?