MATLAB: Removing data from corresponding column

deleting removing data from corresponding column

I have two columns of length 13304×1, and want to plot these against eachother with scatter. However i only want the values below 5 of column A, how can I delete the exact corresponding values of column B? Lets say column A is 11000×1 after deleting values >5, then its tempting to just remove the last 2304 rows of B, but this ruins the correspondance.

Best Answer

mask = A < 5;
A_selected = A(mask);
B_selected = B(mask);
scatter(A_selected, B_selected)

Related Solutions

MATLAB: Removing rows from all columns based on values of one column

Here is an example

X = randi([1 10],10,3)   % example data
TF = X(:,3)  > 5   % for which rows is column 3 larger than 5 
X(TF,:) = []   % remove those rows

MATLAB: How to get the same size of region of interest for two different sets of data of the same size

Get a mask of where both are more than 50, then use that mask to extract the values out of each array:

% Find pixels where BOTH A AND B are each more than 50.
mask = A > 50 & B > 50;
% Extract A from those locations:
A50 = A(mask);
% Extract B from those same locations:
B50 = B(mask);

A50 and B50 will be 1-d lists of array values, not 2-D matrices.

OR if you want to keep A and B as arrays, but just zero out elements not in the mask, do this

% Set A and B to 0 in non-mask pixels:
A(~mask) = 0;
B(~mask) = 0;

or you could set to nan instead of zero, whatever you want to do.

Best Answer

Related Solutions

MATLAB: Removing rows from all columns based on values of one column

MATLAB: How to get the same size of region of interest for two different sets of data of the same size

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