Check a column, if a condition is met use those value

I have excel file containing cyclic data of 25 by 1000. Let say column 3 represent cycle. i was able to plot the data for all cycle. The problem is I am not sure how to plot for specific cycle. sample date could be: A=[1,2,1,4,5;6,7,1,9,10;11,12,1,14,15;16,17,2,19,20;21,22,2,24,25;26,27,2,29,30]

My question is how to chose date from other column when column 3 is specific cycle.(it could be 1, 2, 3 or 1 to 5 or 10 11 13).

Any help would ne much appricated

Answer 1

[KSSV]

A=[1,2,1,4,5;6,7,1,9,10;11,12,1,14,15;16,17,2,19,20;21,22,2,24,25;26,27,2,29,30] ;
%%pick cycle 1
c1 = A(A(:,3)==1,:)

%%pick cycle 2 
c2 = A(A(:,3)==2,:)

[Jan]

+1. And pick cycles 1 to 5:

c1_5 = A(A(:,3) >= 1 & A(:,3) <= 5, :)

or

c1_5 = A(ismember(A(:,3), 1:5), :)

Answer 2

[Guillaume]

If all the cycles are the same length and all the samples from a cycle are together, as in your example, you would be better off reshaping your matrix as 3D, with the cycles in the 3rd dimension

 A = reshape(A, cyclelength, size(A, 2), []);  %where cyclelength is the length of a cycle

It is then trivial to plot any cycle:

hold on
for cyclenumber = 1 : size(A, 3)
   plot(A(:, 1, cyclenumber))  %plot column 1 of cycles, for example
end