Object Reference : Object View and Procedure Reference : Matrix
Set the column headers in a matrix object spreadsheet.
matrix_name.setcollabels label1 label2 label3....
Follow the setcollabels command with a space delimited list of column headers. Note that each column heading should not contain spaces, unless it is enclosed in quotes. If you provide fewer labels than there are columns, EViews will name the remaining columns C1, C2, etc...
mat1.setcollabels USA UK FRANCE
sets the column heading for the first column in matrix MAT1 to USA, the second to UK, and the third to FRANCE.