2 dimensional array operation

Index is 1000x400 logical. Current is 1000x400 double.

    Array2D = Current(Index==0);

Why does Array2D have "399060x1 double" data? I expected to see 1000x400 double. How can I get "1000x400 double"?

[Matt J]

What would Array2D(i,j) be when Index(i,j)==1?

[Stephen23]

"I expected to see 1000x400 double"

The MATLAB documentation describes how array indexing works, and states that when using a logical array like you are, the "output is always in the form of a column vector." This also makes sense, because if you extract some arbitrary number of elements from an array, a vector is the only shape that is guaranteed to be able to hold them.

See also: https://www.mathworks.com/help/matlab/math/matrix-indexing.html

[Goodman]

Thanks a lot, Stephen. I understand. That is what I was looking for

Answer 1

[Matt J]

Maybe you want

   Array2D = Current.*(Index==0);

[Goodman]

Thanks. Yes, I did like you said. It worked.