# Sample and save data to matrix

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Bobo on 29 Jun 2016
Commented: Star Strider on 30 Jun 2016
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

Star Strider on 29 Jun 2016
This works:
x=0.01:0.05:0.5;
y=2:2:20;
z = [x(2:2:end)' y(2:2:end)']
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Star Strider on 30 Jun 2016
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.