[gradsusr] temporal correlation

[Ismaila Diallo]

Dear,

i have model and observation data and i want to calculate the temporal 
correlation between these variables. i use grads version Version 2.0.a7: I try 
this command: tcorr(aa,bb,t=t1,t=t2)

like the following script

define aa=pr.1
define bb=pr.2
define cc=tcorr(aa,bb,t=151,t=273)
d cc

therefore i get this error:
define r1=tcorr(aa,bb,t=151,t=273)
TCORR:  dim = 3, start = 151, end = 273
Data Request Error: Invalid grid coordinates
  World coordinates convert to non-integer  grid coordinates
    Variable = aa  Dimension = 3 
Error from TCORR:  Error getting grids
Operation Error:  Error from tcorr function
  Error ocurred at column 1
DEFINE error:  Invalid expression.


Since a week i posted this difficult but until now i didn't receive help from 
grads forum so i need your help and 

All comment are welcome.

Sincerely

ismaila


 
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