MATLAB: Splitting a matrix by even and odd numbers

matrix split extract even odd

I have a 200×2 matrix. Column A contains a mixture of even and odd numbers. Column B contains 1s and 0s.

Where the numbers in Column A are even, I need to extract those rows into a new nx2 matrix. The numbers in Column A and B must remain correctly alligned.

Hope you can help!

Best Answer

use rem to determine which list of numbers is even or odd

X = [1 3 4 2 5 4 2] % hint X is the first column of your matrix
iseven = rem(X,2)==0

use this logical vector to select the whole row of M

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MATLAB: Concatenating even and odd rows

A=rand(10,16);
B=[A(1:2:end,:),A(2:2:end,:)]

MATLAB: Splitting Images

swap1324 = @(x)([x((floor(size(x,1)/2)+1):end,(floor(size(x,2)/2)+1):end) x((floor(size(x,1)/2)+1):end,1:floor(size(x,2)/2)); x(1:floor(size(x,1)/2),(floor(size(x,1)/2)+1):end) x(1:floor(size(x,1)/2),1:floor(size(x,2)/2))]);
I = imread('cameraman.tif'); %sample image
I2 = swap1324(I);
imtool(I2)

Obviously the above should be broken down into it's own function that doesn't have to repeat the function floor(size(stuff))) over and over again.

Best Answer

Related Solutions

MATLAB: Concatenating even and odd rows

MATLAB: Splitting Images

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