Could anyone help me how to solve the issue

I am having a matrix

A=[0.0088 0.0071 0.0058 0.0049 0.0045 0.0045;

0.0255 0.0248 0.0241 0.0234 0.0227 0.0218;

1.8321 2.0932 2.3378 2.5582 2.7400 2.8653;

0.0666 0.0605 0.0559 0.0526 0.0505 0.0491;

0.0322 0.0294 0.0303 0.0334 0.0372 0.0410]

to find the maximum value in each row i used the command max(A,[],2) which gives the result.

But i need to have the output in such a way that the matrix needs to be displayed holding only the maximum value and rest of the other values should be zero.

Could anyone please help me on this.

Answer 1

[madhan ravi]

[v,idx] = max(A,[],2);
Wanted = zeros(size(A));
 Wanted(sub2ind(size(A),(1:size(A,1)).',idx))  = v

[jaah navi]

with respect to the command line

Wanted(idx) = v

i am getting the result as

Wanted =[0.0666    0.0410         0         0         0         0;
              0         0         0         0         0         0;
              0         0         0         0         0         0;
              0         0         0         0         0         0;
              0         0         0         0         0         0]

could you please help me on this.

[jaah navi]

with respect to command line Wanted(sub2ind(size(A),(1:size(A,1)).',idx)) = v it works fine.

Could you please help me how to find two maximum values in each row of matrix.

[madhan ravi]

Try the edited answer.

[jaah navi]

Yes i tried.Could you please help me how to find two maximum values in each row.

[madhan ravi]

[v,idx]=maxk(A,2,2)
W = zeros(size(A));
W(sub2ind(size(A),repmat((1:size(A,1)).',...
    1,2),idx))  = v

If you're using older version:

max_values = 2;
[v,idx]=sort(A,2,'descend');
W = zeros(size(A));
W(sub2ind(size(A),repmat((1:size(A,1)).',...
    1,2),idx(:,1:max_values)))  = v(:,1:max_values)

[jaah navi]

i am using the older version so i tried with the following code:

max_values = 2;
[v,idx]=sort(A,2,'descend');
W = zeros(size(A));
W(sub2ind(size(A),repmat((1:size(A,1)).',...
    1,2),idx(:,1:max_values)))  = v(:,1:max_values)

It works fine.

I also tried with choosing three values and i tried with the code by changing the max_values =3;

but i am getting error stating Error using sub2ind The subscript vectors must all be of the same size.

Error in (line 20)

W(sub2ind(size(A),repmat((1:size(A,1)).',...

Could you please help me to overcome the error .

[jaah navi]

I corrected the error.Now i am able to get three maximum values in each row.Thanks for your help.