Finding the last maximum value in a vector

Hi,

"max" gives the maximum value of a matrix in a row vector.

This vector contains all the maximum values in the respective column.

if i use [V,X]= max(max(A)) this will give me the largest value of the vector in the corresponding X.

Definitely in the vector there are many values which are equal to max(max(A))

I want to know that how can i know the last index that has this value in the vector.

Pls guide me.

Thanks

Answer 1

[ME]

I think this should do it for you:

idx = max(find(A==max(max(A))))

[Guillaume]

max(max(A)), assuming a 2D matrix, is probably faster as:

max(A(:))

or since R2018b, even faster as

max(A, [], 'all')

[ME]

Fair enough! These are good suggestions!

[Ghulam]

Really thankful to you ME.

It worked

Can you please also answer my This Question and This one.

[Ghulam]

Is there any other method too for finding it.

The suggestion tells.

[Guillaume]

Follow its suggestion then:

X = find(A == max(A(:)), 1, 'last');

I recommend you don't use Max as a variable name. Differentiating variables and function name just by a difference in case is asking for trouble. You can be sure that one time you'll mistype max instead of Max and waste time hunting the bug.

[ME]

As in the suggestion, you could use:

idx = find(A==max(max(A)),1,'last')

instead. You'd also be ale to use the suggestions of Guillaume to speed this up a bit further.

[Ghulam]

Regarding the same question of finding the index of max value.

If i say that i want to find out at which index after this index (i mean the above we calculated) the value become x

[Ghulam]

I found it.

max(find(Max>round(mean(Max))))