rahulruns:

You should be able to do it with something like:

use Spreadsheet::WriteExcel;

. . . . code to build hash . . . .

my $XL = Spreadsheet::WriteExcel->new('output_file.xls');
my $WS = $XL->add_worksheet('my data');

my ($ROW, $COL) = (0, 0);
for my $colname (keys %graph_point_hash) {
    # Add column header
    $WS->write_string($ROW, $COL, $colname);

    # Add column
    $WS->write_col($ROW+1, $COL, $graph_point_hash{$colname});

    # Move on to next column
    ++$COL;
}
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...roboticus

When your only tool is a hammer, all problems look like your thumb.