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Re: checking if variable is defined
> Helle there,
> I would like to plot a variable, but only if it is existing. When the
> Variable is undefined, nothing should happen. So I am searching for an
> expression for the if statement. Does anybody know an expression like:
> if ( vaiable_name existing) then...
One way to do this is with the N_ELEMENTS() function:
if (n_elements( variable ) GT 0) then print,'Variable exists'
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