MATLAB: Using part of data as variables

create variableif statement

Hi, I'm trying to analyze some data exported from another program. This data file has 4 columns and a couple of hundred rows. I'm interested in the data from the 1st and the 4th column, but only for parts of it. The parts in which I am interested can be deduced from the 3th column. Example:
 x   y   z   T
 0   1   0   12
 1   1   0   13
 4   1   0   10
 5   1   0   14
 6   1   .1  17
 2   1   .1  11
 7   1   .1  12
 8   1   .5  14
So to clarify… I want to create a variable x (for z0, z0.1, z0.5 etc.) and a T variable for the same z's…
I just started with using 'if' functions and thought I could maybe use it for this. However, I don't know how. I know the next example isn't correct, but maybe it clarifies what I've got in mind…
if data(,3) == 0
  save corresponding rows of column 1 to x_z00 & T_z00
end
Does anyone have an idea how I could solve this problem?

Best Answer

v=[  0   1   0   12
1   1   0   13
4   1   0   10
5   1   0   14
6   1   .1  17
2   1   .1  11
7   1   .1  12
8   1   .5  14 ]
idx=v(:,3)==0
out=v(idx,[1 4])
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