CAS questions: IF...THEN and length() function

[Nigel (UK)]

Thank you for the RETURN() information; I guess I should have thought of trying uppercase!

So far as length(x+2=y) is concerned, I know that there are three elements because (x+2=y)[1] returns '=', (x+2=y)[2] returns x+2, and (x+2=y)[3] returns y. x+2 is then another three-element list: '+', x, and 2. I was just curious about the reason for a length of 2 being reported. If it is a bug, it's not too important.

Thank you for the program library suggestion. Your SVD program is exactly the type of thing I was looking for. It will be studied!

Nigel (UK)