Error using textread in a function

I tried this function in matlap and it worked, but it is not working in cody

[per isakson]

Is the file, filename.csv, available on the Cody™ server?

Answer 1

[Walter Roberson]

It looks to me as if the filename is passed in as a parameter, so you should not be hard-coding it as a string. At most you would append '.csv' to the variable filename