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MathGroup Archive 2005

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Re: Position different in 5.0 and 5.1?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56091] Re: [mg56057] Position different in 5.0 and 5.1?
  • From: "Tomas Garza Hernandez" <tgarza10 at msn.com>
  • Date: Fri, 15 Apr 2005 04:47:33 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

The Help Browser indicates that there have been some changes in V. 5.1 
concerning StringTake and other related functions (q.v.). Under this 
circumstances, and since there is a funcion StringCases, which appears to be 
new in V. 5.1, the following achieves what you want:

In[1]:=
Position[StringCases[{"asd", "dsa"}, x_, 1],
  y_ /; y == {"a"}]

Out[1]=
{{1}}


Tomas Garza
Mexico City

>From: "J R Gog" <jrg20 at cam.ac.uk>
To: mathgroup at smc.vnet.net
>Reply-To: "J R Gog" <jrg20 at cam.ac.uk>
>Subject: [mg56091] [mg56057] Position different in 5.0 and 5.1?
>Date: Thu, 14 Apr 2005 08:55:35 -0400 (EDT)
>
>I've recently upgraded from 5.1 from 5.0 and have found that some of my old
>notebooks don't seem to work. I think I have the essence of what I'm 
>utterly
>confussed about in this example:
>Position[{"asd", "dsa"}, x_ /; (StringTake[x, 1] == "a")]
>
>What I want is the position of list entries which have first character "a".
>In 5.0, this line works. In 5.1, I get an error that StringTake is being 
>fed
>a string.
>
>I can't find any documentation that explains what has changed to have this
>effect. I'm sure I've missed something obvious, but if anyone can explain 
>to
>me what has changed, it would be very helpful indeed. I know I can do
>everything some other way, but I need to know exactly what old stuff I need
>to change!
>
>
>
>Thanks
>
>
>
>Julia Gog
>
>



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