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
>
>