Object Reference : Object View and Procedure Reference : Matrix
Set the row headers in a matrix object spreadsheet.
matrix_name.setrowlabels label1 label2 label3....
Follow the setrowlabels command with a space delimited list of row headers. Note that each row heading should not contain spaces, unless it is enclosed in quotes. If you provide fewer labels than there are rows, EViews will name the remaining rows R1, R2, etc...
mat1.setrowlabels USA UK FRANCE
sets the row heading for the first row in matrix MAT1 to USA, the second to UK, and the third to FRANCE.