Thank you very much Robert Israel and gkokovidis, it worked. So the sequence command is used to generate a list, that's useful to know I didn't know that before. I have another question:
I have defined a 90 rows 4 columns matrix named B.
I have also defined 90 variables αi where i goes from 1 to 90 and represent the number of rows in the B and C matrix.
Now, I want to define a new C matrix whose elements are computed using matrix B and the variables.
the row 1 column 1 element of the C matrix = B[row 1, column1]*α1 + some constant
the row 1 column 2 element of the C matrix = B[row 1, column2]*α1 - another constant
the row 1 column 3 element of the C matrix = B[row 1, column3]*α1
the row 1 column 4 element of the C matrix = B[row1, column 4]*α1
I have made up the equations but the important point is that the used variable is the same for a row, only the equation change.
the row 2 would then use α2 as the variable and so on until row 90
How would i do that? Thank you