[gradsusr] using formula in grads

[wendi harjupa]

Dear Grads users,

I need help about to use function of grads;

I want to convert the ref (dbz) to Rain (mm/hr)
by using Z-R correlation formula, as below :

'R=pow((pow(10, ref/10))/200,5/8)',

Then I want to accumulate the rainrate for 1 hour,
I use this formula :

'R1=sum(R, t=1, t=15)'
'd R1'

But I got strange result.

The value of R1 much larger than the value of ref..
what can I do?

thank you before...

Best regards,
wendi
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