Sample and save data to matrix

I have a matrix A=[x;y]', where x and y are vectors say

x=0.01:0.05:0.5
y=2:2:20

I would like to sample and save the data to a matrix Z as:

Z= [0.0600    4.0000
    0.1600    8.0000
    0.2600   12.0000
    0.3600   16.0000
    0.4600   20.0000]

Thank you

Answer 1

[Star Strider]

This works:

x=0.01:0.05:0.5;
y=2:2:20;
z = [x(2:2:end)' y(2:2:end)']

[Bobo]

Thanks Strider!

But what if the data is not equally spaced?

[Star Strider]

I’m not certain what you mean by ‘not equally spaced’. If they’re not the same lengths, the code changes to:

x=0.01:0.05:0.5;
y=2:2:20;
minlen = min([length(x) length(y)]);
z = [x(2:2:minlen)' y(2:2:minlen)'];

This of course assumes that ‘x’ and ‘y’ are vectors. If they are matrices, you need to use the size function instead of length, specifying the dimension you want to use to specify the length, 1 for row length and 2 for column length.

If you want to choose a different step (here the step is 2), you would have to make the appropriate changes to the code to be sure the vectors are equal length, or use a cell array. The cell array would likely be easier.