PA32R
Posts:
4
Registered:
7/18/11


Re: Replace, test question
Posted:
Jul 20, 2011 6:01 AM


On Jul 19, 4:12 am, Yves Klett <yves.kl...@googlemail.com> wrote: > Hi, > > you need to supply x as argument to PrimeQ... alternatively use PatternTest: > > {58, 61, 15, 66, 10, 2, 24, 81, 45, 84} /. x_ /; PrimeQ[x] > P > > {58, P, 15, 66, 10, P, 24, 81, 45, 84} > > {58, 61, 15, 66, 10, 2, 24, 81, 45, 84} /. x_?PrimeQ > P > > {58, P, 15, 66, 10, P, 24, 81, 45, 84} > > Regards, > Yves > > Am 18.07.2011 12:15, schriebPA32R: > > > > > > > > > I'm very new to Mathematica and trying to work my way through it. I > > don't understand why: > > {58, 61, 15, 66, 10, 2, 24, 81, 45, 84} /. x_ /; PrimeQ > P > > returns: > > {58, 61, 15, 66, 10, 2, 24, 81, 45, 84} > > > I would expect it to take the list, replace everything in the list > > that matches any pattern and passes the PrimeQ test, i.e., is prime, > > with P to yield: > > {58, P, 15, 66, 10, P, 14, 81, 45, 84} > > > Can someone explain my misunderstanding? > > > Thanks.
Thanks everyone, I got it done. The assistance is much appreciated.

