.
such as using ENVI_WRITE_ENVI_FILE in my pro
IDL> ENVI_WRITE_ENVI_FILE
% Attempt to call undefined procedure/function: 'ENVI_WRITE_ENVI_FILE'.
Do I have to set some things in IDL or write codes to let IDL find these functions, or give up IDL
IDL> ENVI_WRITE_ENVI_FILE
% Attempt to call undefined procedure/function: 'ENVI_WRITE_ENVI_FILE'.
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