Re: List Position
- To: mathgroup at smc.vnet.net
- Subject: [mg15784] Re: List Position
- From: "Allan Hayes" <hay at haystack.demon.co.uk>
- Date: Sun, 7 Feb 1999 02:04:00 -0500 (EST)
- References: <79eagc$9ig@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Harry flynn wrote in message <79eagc$9ig at smc.vnet.net>...
>Can anyone tell me how I find the position in a list of the first value
>less than or equal to zero.
>For example, how can I get Mathematica to tell me that in the list
>{{1},{1},{2},{8},{-3}}
>that the first value of interest to me is position 5. Thanks in advance.
>Harry.
Position[
{{1},{1},{2},{8},{-3}},
{x_}/;x<=0,
{1},
1
]
{{5}}
The HelpBrowser gives
Position[expr, pattern, levspec, n] gives the positions of the first n
parts of expr which match the pattern.
Allan
---------------------
Allan Hayes
Mathematica Training and Consulting
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