delete some columns in A and the same columns in another matrix C

Hi all, I have matrix A and C as follows.How to do the function that deletes the columns whose last two values of matrix A are NaN and at the same time delete the same columns in C ? Results expected: a is the new matrix after we delete the columns from A as required. c is the new matrix after we delete the columns from C, with deleted columns indexed as those from A...

a = A(:, ~isnan(a(end-1,:)) | ~isnan(a(end,:)))

helps to get the following results. But I don't know how to get the index of the deleted columns from A so that I can work on C.Thanks.

A =
     1   NaN     1     1
     1     1     1     1
   NaN   NaN   NaN     1
   NaN   NaN     1   NaN
a =
     1     1
     1     1
   NaN     1
     1   NaN

Answer 1

[dpb]

>> idx=all(isnan(A(end-1:end,:)))
idx =
   1     1     0     0
>>