keep getting error in the covariance: Subscript indices must either be real positive integers or logicals.

I keep getting this error in calculating the covariance between two variables, how should I do it to avoid the error?

Subscript indices must either be real positive integers or logicals.

Error in model7 (line 84) cov = cov(M, W);

Answer 1

[David Young]

It looks as if you have used cov as the name of a variable.

Do

which cov

to see if this is the case. You should see a path ending in "cov.m". If you do not, look through your code to find where cov has been used as a variable and consistently change the name of all occurrences of the variable. The editor can help you do this quickly.

Once you have fixed your code, you may need to use the command

clear cov

before running it again.