I have an array values to export in excel report. SO how can i dynamically incr

how are you exporting the data to excel (are you using some plug-in?) Where is the data coming from? If you are exporting an array, what does increasing the column or row number mean?

i am fetching data from report based on some filters and storing that data in to mpv's.
that pv's data i want to show in excel...

Look at Export Excel or SQL to Excel V2 plug-in. You can directly point the report to be exported to SQL.