MATLAB: Is there a simpler way to find the index of the first non NaN value in a vector

Question

temp = X;
temp(~isnan(temp)) = 1;
temp(isnan(temp)) = 0;
temp = find(temp);
first_non_NaN_index_of_X = temp(1);

Answer 1

X= [NaN NaN 1 2 3 4 5]; 
first_non_NaN_index_of_X = find(~isnan(X), 1);