Issue with path is breaking some built-ins

I recently reset my path to default. Ever since, when I try to use the isnan function, I get the following error message:

Check for missing argument or incorrect argument data type in call to function 'isnan'.

I think that this must have something to do with my path being set to default, but I'm not sure how to fix it. Do I have to write my own isnan.m function? Or should I just redownload MATLAB and hope that fixes it?

Thanks for your help.

Answer 1

[Fangjun Jiang]

Did you run "restoredefaultpath" to restore the path? Usually it should resove any problem related to the path.

Run "which -all isnan" to see if there are any items that are not "built-in" or from non-MATLAB folder.