Re: Replace, test question
- To: mathgroup at smc.vnet.net
- Subject: [mg120352] Re: Replace, test question
- From: Yves Klett <yves.klett at googlemail.com>
- Date: Tue, 19 Jul 2011 07:00:13 -0400 (EDT)
- References: <j0113e$qad$1@smc.vnet.net>
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, schrieb PA32R:
> 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.
>