get only one value from 251x150 double in matlab

Assuming you want to extract a single element from a matrix in MATLAB which has dimensions 251x150, you can simply use indexing. For example, to extract the element at row 10 and column 20, you can write:

main.m
mat = rand(251,150); % create a random 251x150 matrix
val = mat(10,20);    % extract the element at row 10 and column 20
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This will assign the value at (10,20) in the matrix mat to val. You can replace 10 and 20 to extract any other element you want.