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

if loop

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

Best Answer

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,:)

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MATLAB: Reshape 3d matrix to obtain a column vector

A(:,:,1) = [1 2 3; 4 5 6; 7 8 9]
A(:,:,2) = [10 11 12; 13 14 15; 16 17 18]
A(:,:,3) = [19 20 21; 22 23 24; 25 26 27]
B=permute(A,[2 1 3])
out=B(:)

MATLAB: I have a marix of zeros(100100) and i have 5 values of rows and cols in rc.(getting these values from another function). Now i want to make a new matrix B of same size as A(100100) and want ones on that rows and cols provided by rc and zeros else

rc = [2  5
      3  5
      7  9
     15 69
     95 6];
B = full(sparse(rc(:, 1), rc(:, 2), 1, size(A, 1), size(A, 2)));

is one way of doing it. Another way:

B = zeros(size(A));
B(sub2ind(size(B), rc(:, 1), rc(:, 2))) = 1;

Best Answer

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MATLAB: Reshape 3d matrix to obtain a column vector

MATLAB: I have a marix of zeros(100*100) and i have 5 values of rows and cols in rc.(getting these values from another function). Now i want to make a new matrix B of same size as A(100*100) and want ones on that rows and cols provided by rc and zeros else

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MATLAB: I have a marix of zeros(100100) and i have 5 values of rows and cols in rc.(getting these values from another function). Now i want to make a new matrix B of same size as A(100100) and want ones on that rows and cols provided by rc and zeros else