MATLAB: How to generate a matrix with 2 columns and changeable number of rows

Question

Hello

I am new to the MATLAB and I need help

I want to generate a matrix with 2 columns and changeable number of rows according to user input. each number in the matrix will be more than the previous one with a certain number define by user. (in the example below I used 0.4)

here is the output that I am trying to obtain

[ 0      0
 0.4    0
 0.8    0
 1.2    0
  0    0.4
 0.4  0.4
 0.8  0.4
 1.2  0.4
  0   0.8
 0.4  0.8
 0.8  0.8
 1.2  0.8
   0   1.2
 0.4  1.2
 0.8  1.2
 1.2  1.2 ]

any suggestions ??

Answer 1

use the meshgrid (link) function (or optionally ndgrid (link)):

step = 0.4;
v = 0 :step : 3*step;
[X,Y] = meshgrid(v);
OutMg = [Y(:), X(:)];
step = 0.4;
v = 0 :step : 3*step;
[X,Y] = ndgrid(v);
OutND = [X(:), Y(:)];

Choose the function that most closely approximates what youwant to do. Here, they both produce the same result.