finding indexed values of vector

I have a data set that cotnains FWHM. I want to identify the 2 highest values and highlight on a graph. I have used sort rows and picked out the 2 highest values given by Cam2G:

Cam2G =

      2.6200
      2.5800

If my unsorted data is dataR, how do I get the index in this where the values Cam2G occur?

Answer 1

[Guillaume]

When you did your sorting, you should have captured the second return value, which is the indices of the sorted values.

dataR = [2.4 2.62 .3 2.5 2.58];
[cam2G, indices] = sort(dataR);
cam2G = cam2G([1 2]);
indices = indices([1 2]);

If somehow, it's too late:

indices = arrayfun(@(v) find(dataR == v, 1), cam2G);

[Jason]

Thats great, thankyou. If now i have set of the two max values for Cam2G and do the same for another data set Cam2Gb, so now there are 4 max values. How do I find the overall max, I tried:

max(max(Cam2G, Cam2Gb))

i get
Error using max
Too many input arguments.

[dpb]

max([Cam2G(:); Cam2Gb(:)])

NB: used (:) to ensure both are column vectors; use concatenation as appropriate to the storage direction.

[Jason]

thankyou

Answer 2

[dpb]

Use the optional second index return value from sortrows

[mx,imx]=sortrows(FWHM);

Keep the first N of each...

Answer 3

[Jason]

But I need to find the index in the unsorted data, not the sorted?

[dpb]

doc sortrows