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[Richard anyah]

Dear all,



I am a student at the University of connecticut doing research on
cliamate variability. I am new to GrADS, and I am having problem using
the (UDF) psichig. I think I have sucssesfuly installed the UDF but I
am developing priblem from the start. When I try to run the test file "
t.psichig.sh" I get the error massage below,



Non-numeric args to numeric operation

  Error occurred on line 3

  In file t.psichig.sh



Line 3 is the test run of "t.psichig.gs" now when I try to run "t.pschig.gs" i get the error massage below,



Syntax Error:  Invalid Operand 

  'psi' not a variable or function name

  Error ocurred at column 1

DISPLAY error:  Invalid expression 

  Expression = psi(all,ua,va)



Can somebody help in identifying the problem and the possible solution.



And is there another way of getting the velocity potential without using the "UDF- psichig"



Thank you in advance




______________________________________________________________________ 

Richard Anyah 

North Carolina State University 


Dept.of Marine,Earth & Atmospheric Sciences 

P.O Box 8208 Raleigh, NC 27695-8208 
Tel: 919 755 1742 (H)
       919 513 0243 (O)

 www: http//www4.ncsu.edu/~roanyah
 


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