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Hi I have MATLAB specific question. Lets say I have a matrix of 5 rows and 20 columns in a variable called signal . I

Hi I have MATLAB specific question.

Lets say I have a matrix of 5 rows and 20 columns in a variable called signal . I need to calculate mean of the row values using only data from columns: 4,10,12 and 18. I know of the function 'M = mean(A)' but how do I calculate mean of rows from specific columns and not all columns?

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