get only one field from 251x150 double in matlab

Suppose you have a 251x150 double matrix A and you want to extract the 100th column and save it to a new variable B.

You can do this by indexing the matrix:

main.m
B = A(:,100);
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Here, : denotes all the rows, and 100 denotes the 100th column.

Now, B contains a 251x1 column vector with the values of the 100th column of A.