nanstd error - Undefined function 'nanvar_base' for input arguments of type 'double'.

Dear All,

I've been happily using nanstd for years...but lately it's giving me an error:

Undefined function 'nanvar_base' for input arguments of type 'double'.

It doesn't work with any vector ot matrix, with any of the combinations of flag/dim etc. Not even with the example matrices in the documentation.

I'm using matlab2015a.

I've seen in some documentation saying that in future releases nanstd will be gone. Is this what's happening?

Can anyone help me understand, please?

Thanks!!

Ilaria