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Re: Define a variable [message #80351] Wed, 13 June 2012 00:44 Go to next message
dplatten is currently offline  dplatten
Messages: 32
Registered: December 2007
Member
The function N_ELEMENTS will tell you. If the result is zero then the variable doesn't exist:

N_ELEMENTS(x)

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Re: Define a variable [message #80500 is a reply to message #80351] Wed, 13 June 2012 00:55 Go to previous message
hadi is currently offline  hadi
Messages: 33
Registered: June 2012
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On Jun 13, 4:44 pm, David Platten <dplat...@gmail.com> wrote:
> The function N_ELEMENTS will tell you. If the result is zero then the variable doesn't exist:
>
> N_ELEMENTS(x)
>
>

Dear David
I put this command on the IDL command N_ELEMENTS (X), but I recieved
this error experation.
"% Attempt to call undefined procedure/function: 'N_ELEMENTS'.
% Error occurred at: $MAIN$
% Execution halted at: $MAIN$ "
Best, Hadi

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