[gradsusr] fish_psi function error

[lpasmanoranjan]

Dear Users,
I am having a problem while computing stream function using opengrads.

I use the following command:
ga-> psi= fish_psi(u,v)
Notice:  Automatic Grid Interpolation Taking Place
Error from fish: rc = 1000
Operation Error:  Error from fish function
Operation Error:  Error from fish_psi function
Error ocurred at column 1
DEFINE error:  Invalid expression.

However the fish_vor is working fine:
ga-> vor= fish_vor(u,v)
Notice:  Automatic Grid Interpolation Taking Place
Define memory allocation size = 4200768 bytes

Thank you for any kind of help or suggestion in this regard.

--
Kind Regards,
Mano
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