Re: Maximum y-value in a list of xy pairs
- To: mathgroup at smc.vnet.net
- Subject: [mg61198] Re: Maximum y-value in a list of xy pairs
- From: "Ray Koopman" <koopman at sfu.ca>
- Date: Wed, 12 Oct 2005 01:43:06 -0400 (EDT)
- References: <difq2j$f3i$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
pairs[[Ordering[Reverse/@pairs,-1]]]
{{7, 0.742}}
mike_in_england2000 at yahoo.co.uk wrote:
> Hi
>
> Is there an easy way of finding the maximum y-value of a list of x-y
> pairs? For example:
>
> pairs = {{0, 0.175}, {1, 0.54}, {2, 0.27}, {3, 0.47}, {4, 0.325}, {5,
> 0.527}, {6, 0.22}, {7, 0.742}, {8, 0.109}, {9, 0.3314}, {10,
> 0.1481}}
>
> Max[pairs] gives 10 which isnt what I want. At the moment I am doing
> this:
>
> maxy = 0;
> Do[
> currentx = pairs[[count]][[1]];
> currenty = pairs[[count]][[2]];
> If[currenty > maxy,
> maxy = currenty;
> x = currentx;
> ];
> , {count, 1, Length[pairs]}
> ]
> Print[{x, maxy}]
>
> Which gives the maximum y value along with with its x-value but I
> suspect that there is a much more elegant way. Any help would be
> appreciated.
>
> Thanks,
>
> Mike