Mapping pixels of two matrices

Question

Say that I have two matrices of the following sizes:

matrix_1 = 30090x2

matrix_2 = 170x177

Assume here that the number of rows n

Answer 1

Here is an option

  matrix_1 = matrix_2(:);

which copies the elements (all of them) of matrix_2 in one long column.

In your data you said that matrix_1 has two columns, you can add a further empty column by doing, for instance

  matrix_1  = [matrix_1 zeros(size(matrix_1))];