How can i transfer a specific number in matrix to another number along the solution matrix??

Hello. I'n very novice in MATLAB, so please undersatand me..!

My queation is as title.

Let me an example.

x = [1,0,0,1]  % binary 
A = [-27, -10, -11, -25]

In this example, first and fourth number of x is 1.

Along x, first and fourth number of A is -27, -25.

And I want to change the bigger number of this two number to zero.

Namely, -27 < -25, so -25 transfer to 0.

The result is

A = [-27, -10, -11, 0]

if

x = [1,1,0,0]  % binary 
A = [-27, -10, -11, -25]

the result is

A = [-27, 0, -11, -25]

How can I code this logic??

Many masters in the world, please Help me.

Answer 1

[Simon Chan]

Try this:

[value,~]=max(A(logical(x)));
A(A==value)=0;

[연승 김]

Thank you. it work nice!!

Answer 2

[Walter Roberson]

x = [1,0,0,1]  % binary 

x = 1×4

1 0 0 1

A = [-27, -10, -11, -25]

A = 1×4

-27 -10 -11 -25

xidx = find(x==1);
[~, maxidx] = max(A(xidx));
A(xidx(maxidx)) = 0;

A

A = 1×4

-27 -10 -11 0

[연승 김]

Thank you. it work nice!!

Answer 3

[Chunru]

x = [1,1,0,0];  % binary 
A = [-27, -10, -11, -25];
idx = find(x);
[~, i0] = max(A(idx));
A(idx(i0)) = 0;
A

A = 1×4

-27 0 -11 -25

% A = [-27, 0, -11, -25]

[연승 김]

Thank you. it work nice!!