Finding maximum in a matrix

2019 6 22
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更新时间：2019 6 24
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Suppose I have 1000x1 matrix and my data is from (50,60) and then from (160,170) and so on (i.e randomly distributed), What I want is to find maximum out of this 50 to 60 location and then maximum from 160 to 170 location and so on. How to find this ?

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Walter Roberson
Walter Roberson 2019-6-22
Are those data ranges or are they index locations ?
If they are index locations, are the locations known ahead of time?
Rohan Mehta
Rohan Mehta 2019-6-22
index locations
Rohan Mehta
Rohan Mehta 2019-6-22
yes these locations are stored in another matrix

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KALYAN ACHARJYA
KALYAN ACHARJYA 2019-6-22
编辑：KALYAN ACHARJYA 2019-6-22

0 个投票

Suppose mat is 1000x1 matrix
%this will give the maximum value within the matrix uptp 50 rows and 60 colm
mat1=mat(1:50,1:60);
max1=max(mat1(:));
You can do the same form other also
mat2=mat(1:160,1:170);
max2=max(mat2(:));
Is this you are looking for?

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Rohan Mehta
Rohan Mehta 2019-6-22
Hi Thanks for help
But what I want is that my data locations are stored in another matrix named K which has 5 variables (Say 50,250,550,750,950) that contain location of my data in matrix A, So I want to find maximum out of the 40 to 60 locations and then from 240,260 and then from 540 to 560 and so on...
KALYAN ACHARJYA
KALYAN ACHARJYA 2019-6-22
编辑：KALYAN ACHARJYA 2019-6-24
to read the index of maximum elements do the following
max1=max(a(:));
[r1,c1]=find(a==max1)
As your comment is confusing, though the question seems easy, thats why I have provided the how to find maimum from a matrix and read the index of maximum elements. Rest you can store the indeces as you want.
Rohan Mehta
Rohan Mehta 2019-6-24
Hello Sir this piece of code almost solved my problem As I have found all the maximums but one doubt is how to assign the location's of these maximum to another matrix ?
KALYAN ACHARJYA
KALYAN ACHARJYA 2019-6-24
how to assign the location's of these maximum to another matrix?
The second part of comment is not clear for me.
Are you looking for this one?
mat_other(r1,c1)
%..........^ index values from first matrix having maximum value

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