isnan input arguments of type 'cell'

I am getting a cell error

a={'2' [NaN] '4' '5'}
isnan(a)

Undefined function 'isnan' for input arguments of type 'cell'.

How can I get around this error

Answer 1

[the cyclist]

cellfun(@isnan,a)

[Rahul]

thanks...

[Kavya Ashok]

This returns the index of a where nan exists. What if you want Nan to be removed from the original array?

Answer 2

[Debejyo Chakraborty]

Sometimes this may be necessary: b = cellfun(@isnan,a,'UniformOutput',false);