Wronskian

[salvomic]

This code

Code:


IF (  (s < 2) OR (TYPE(flist) == 2) OR (TYPE(flist(1))==2) OR (TYPE(flist(2))==2) ) THEN return "Input a [vector] of functions";
ELSE
...

is a bit "dirty": I would control *every* part of an input like [x, x^2, 1-x, ...] not only the first two, to be NOT a string.
I thought to use something like

Code:


FOR h FROM 1 TO s DO // s = size of flist
IF (TYPE(flist(h)==2) THEN return "They must be string"; END;
END;

but it doesn't work here (if there is that, doesn't work this: "IF EXPR(" wronskian.ChooseType()")=1 THEN return mat;").

And that IF

Code:


IF (TYPE(flist) <> 4) THEN print "It would be better use [vector] in []"; END;

after the ELSE doesn't control anything, as input is always list, also with [...], and I would need to control that the input should be *only* a vector (but I don't know how)...

Any help is much appreciated!

Salvo