What means the definition F[t_?NumericQ] :=...?

Asked Jan 20 '15 at 20:52

Active Jul 25 '17 at 17:36

Viewed 51 times

I've come along a function defined in this way:

F[t_?NumericQ] := NDSolve[{-u''[x] - u[x]/x == -t^2 u[x], u[x0] == x0, u'[x0] == 1}, u, {x, x0, x1}]

What does the

t_?NumericQ

mean and what does it bring us over the use of just F[t_]?

edited Jul 25 '17 at 17:36

LCarvalho

asked Jan 20 '15 at 20:52

wondering

3

Please see specifically: User-defined functions, numerical approximation, and NumericQ. If you are confused by the syntax see PatternTest. And while you're at it see (1699). – Mr.Wizard Jan 20 '15 at 20:58
Thank you. Just before you posted the comment, I found the answer here: http://support.wolfram.com/kb/12502 (which is actually a link contained in the first link you mentioned). – wondering Jan 20 '15 at 21:11

0 Answers0