find maximum value of column when row is known and value of Array is non zero?

if true
  % code
A = [51 2 3  nan;
    4 5 6 7;
   42 16 45 63;
   NaN 2 56 12;
   NaN 45 26 32];

how to code for max value of column for 1st row where A is not a NaN.

Answer 1

[Jan]

Maybe you want:

A = [51 2 3  nan;
      4 5 6 7;
     42 16 45 63;
     NaN 2 56 12;
     NaN 45 26 32];
index = find(~isnan(A(:, 1)), 1, 'last')
value = A(index, 1)

This replies the index and value of the bottommost non-NaN element in the first column of A.

[madhan ravi]

+1 concise