[ncl-talk] a question about changing netcdf file

[Zheng Lu]

Hi, dear NCL group,

I would like to change the values in a large netcdf file (4000*6000). For
example, if I use the following expression:

in=addfile("a.nc","w")
in->A_Variable(123,1344)=12.3

it takes about only a few seconds,

However if I use

in->A_Variable(123,1344)=12.3*x

, where x is a variable. it takes forever to assign the value to A_Variables

Any idea why?

Thanks very much!


Zheng
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