MATLAB: Matrices with customized sums for rows and columns

Question

I want to create 4 matrices (6×10) with sums of rows and columns as following; in a single program/code.

mat1::::sum_row1=sum_row2=……=sum_row6=r(say),,,,,,sum_col1=sum_col2=……=sum_col6=c(say)&&&&&&r=c

mat2::::sum_row1=sum_row2=……=sum_row6,,,,,,,,,,,,,sum_col1≠sum_col2≠……≠sum_col6

mat3::::sum_row1≠sum_row2≠……≠sum_row6,,,,,,,,,,,,,sum_col1=sum_col2=……=sum_col6

mat4::::sum_row1≠sum_row2≠……≠sum_row6,,,,,,,,,,,,,sum_col1≠sum_col2≠……≠sum_col6

Kindly suggest some logic/program

Thanks

Answer 1

Try randfixedsum: http://www.mathworks.com/matlabcentral/fileexchange/9700-random-vectors-with-fixed-sum