how can I find the maximum value in each row of a matrix and sum along the column then assign the values to another matrix

example

2 3
3 4
5 3
1 2
3 2.5

the answer will be a vector (5+3, 3+4+2) the code may be incorrect but, I only try my assumptions.

v=[1400 1600 1200 800 1000];
r=[500 400];
for i=1:numel(v)
    t=0;
    for j=1:numel(r)
        eet(i,j)=v(i)./r(j);
        et(i,j)=v(i)./r(j);
        c(i,j)=eet(i,j)+t;
        ctc(i,j)=eet(i,j)+t;
        t=t+eet(i,j);
    end
end;
M=max(eet,[],2); % this gives me all the maximum value along a colunm vector

[Stephen23]

@Bashir Yusuf Bichi: today I formatted your code correctly for you. Please do not keep reverting it. In future you can format it correctly yourself: simply select the code text, then click the {} Code button.

[Bashir Yusuf Bichi]

Thank you so much

Answer 1

[Stephen23]

All you need is max and accumarray:

>> M = [2,3;3,4;5,3;1,2;3,2.5];
>> [V,I] = max(M,[],2);
>> B = accumarray(I,V)
B =
   8
   9

[Bashir Yusuf Bichi]

thank you for your answer now the problem is I indicates the index and V the maximum value, I want to add all max value with I=1, and all max values with I=2. so that I will have a vector r=(sum(index=1),sum(index=2)).

[Bashir Yusuf Bichi]

thank you I did not notice B= accumarray(I,V).

[Stephen23]

That is exactly what my code already does. The accumarray call sums the values for each of I==1, I==2, etc., giving the sum in vector B. Did you try it? Compare the values of B with your expected output: they are exactly the same: that is because my code already calculates the sum that you requested.

[Bashir Yusuf Bichi]

thank you once again

[Andrei Bobrov]

+1.

Hi! Mr. Master! :)