[gradsusr] Convert monthly to yearly accumulated rainfall

[Alauda arvensis]

Dear GrADS users,

My data consists of 50 years of monthly rainfall. I want to convert this
data into yearly accumulated rainfall for every year. So I am looking for
something like:

'pyearly = sum(pmonthly, t=1, t=12)' ... but I need it for every year, so
that in the end I have 50 time steps.

Any hints welcome! Thanks!

Kind regards,
Chris

PS: I already tried "mon2yr.gs" from Bin Guan's page, but something does not
appear to work.
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