construct meshgrid matrices without using function meshgrid.

Hi, I am going to construct meshgrid matrices1 x(i, j), y(i, j), given the grid points x=[0: 0.1:10], y=[0:0.2:10]. when I try x.*y.'. It can't go through. I know I can produce an mn matrix C with elements C(i, j) = x(i)y(j), i=1:m, j= 1:n. But I dunno how can I start with.

Answer 1

[Image Analyst]

Try this:

% Sample data.
x = [0 : 1 : 10]  % Change the middle "step" number if you want.
y = [0 : 2 : 10]

% Traditional way using meshgrid().
[X, Y] = meshgrid(x, y)

% Alternate way using loop.
rows = length(y);
columns = length(x);
xLoop = zeros(rows, columns);
yLoop = zeros(rows, columns);
for column = 1 : length(x)
  xLoop(:, column) = x(column);
  yLoop(:, column) = y;
end
% Print to command window.
xLoop
yLoop

[jarvan]

thank you!

Answer 2

[Mert Yiyit]

function [A,B] = mgrid(x,y)

m = length(x);

n = length(y);

for i= 1:n

for j= 1:m

A(i,j) = x(1,j);

end

end

for q = 1:m

for z = 1:n

B(z,q) = y(1,z);

end

end

[Stephen23]

Note that the outputs A and B should be preallocated, as Image Analyst's answer from four years ago shows.