udf question

[Mary Jo Nath]

Dan,

I think the function name is too long.
 From http://grads.iges.org/grads/gadoc/udf.html :
(this is under the section "The user defined function table")

    Field 1: The name of the function, 1-8 characters, beginning with a
    letter. The name should be in lower case. Note that function names
    are not case dependent, and that GrADS converts all expression to
    lower case before evaluation.

MJ

Dan Schwarzkopf wrote:
> given that my UDF executable is called 'ttestudf_linux' in the udf
> function table, with 4 arguments, and
> I write 'd ttestudf_linux('var1','var2','var3','var4')'
> and get a message
> Syntax Error: Invalid Operand
> 'ttestudf_linux' not a variable or function
> Error ocurred at column 1
> DISPLAY error:  Invalid expression
>  Expression = ttestudf_linux(100,annc1,100,annf161)
>
> what am I doing wrong?
>

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