How can I pass 2-D meshgridded var into a 3-D matrix?
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Ezz El-din Abdullah
on 21 Jul 2017
Commented: Ezz El-din Abdullah
on 21 Jul 2017
I need to pass X and Y which are 2-D meshgridded matrices into c the 3-D matrix. where k is a constant and zv is a vector.
Here is my try:
for i = 1:M
c(:,:,i)=exp(1j*k/(2*zv(i))*(X2.^2+Y2.^2));
end
Thanks.
4 Comments
Steven Lord
on 21 Jul 2017
Show us the sizes of all of X2, Y2, c, and zv as well as the value of M as they are immediately before you enter the loop.
Accepted Answer
Guillaume
on 21 Jul 2017
Edited: Guillaume
on 21 Jul 2017
Step 1: permute your vector so that it is along the 3rd dimension:
zv = permute(zv, [3 2 1]); %if zv is a column vector (M x 1)
%or
zv = permute(zv, [1 3 2]); %if zv is a row vector (1 x M)
Step 2: No need for loop, use memberwise operation + implicit expansion (if on R2016b or later):
c = exp(1j*k./(2*zv)) .* (X2.^2 + Y2.^2));
If on version < R2016b:
c = bsxfun(@times, exp(1j*k./(2*zv)), (X2.^2 + Y2.^2));
6 Comments
Guillaume
on 21 Jul 2017
As I wrote,
If on version < R2016b:
c = bsxfun(@times, exp(1j*k./(2*zv)), (X2.^2 + Y2.^2)); %after the permute
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