MATLAB: Are the first 3 elements of a vector NaN

Question

Dear all,I have

A={

 [NaN]
    [NaN]
    [NaN]
         [3]
    [3]
    [6]
    [4]}

I want to find a rule that will tell me if the first 3 elements of a vector A are NaN or not

thanks

Answer 1

A is a cell.

all(cellfun(@isnan,A(1:3)))