Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Software » comp.soft-sys.math.mathematica

Topic: Replace, test question
Replies: 6   Last Post: Jul 20, 2011 6:01 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
PA32R

Posts: 4
Registered: 7/18/11
Re: Replace, test question
Posted: Jul 20, 2011 6:01 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

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.




Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.