how to generate a matrix with 2 columns and changeable number of rows

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

[Star Strider]

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.

[LB]

thank you i used ndgrid and it is exactly what i need

[Star Strider]

As always, my pleasure.

Answer 2

[Steven Lord]

Call the meshgrid function and reshape the outputs from meshgrid into column vectors.

[LB]

thanks

Answer 3

[Walter Roberson]

[C1, C2] = ndgrid((0:num_increments-1) * increment_value);
output = [C1(:), C2(:)];