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Re: Replace, test question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg120335] Re: Replace, test question
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Tue, 19 Jul 2011 06:57:09 -0400 (EDT)
  • References: <201107181013.GAA26882@smc.vnet.net>
  • Reply-to: drmajorbob at yahoo.com

{58, 61, 15, 66, 10, 2, 24, 81, 45, 84} /. x_ /; PrimeQ@x -> P

{58, P, 15, 66, 10, P, 24, 81, 45, 84}

or

{58, 61, 15, 66, 10, 2, 24, 81, 45, 84} /. x_?PrimeQ -> P

{58, P, 15, 66, 10, P, 24, 81, 45, 84}

Bobby

On Mon, 18 Jul 2011 05:13:23 -0500, PA32R <tio540s1 at gmail.com> wrote:

> 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.
>


-- 
DrMajorBob at yahoo.com


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