Why don VAPORs IDL routines work?
There are two likely reasons why you might not be able to invoke IDL language extensions, provided by VAPOR, from an IDL session. The first is quite simply that your version of VAPOR wasn’t built with IDL support. Look in $VAPOR_HOME/lib for the IDL support libraries libidl_vdfmodule.dlm and libidl_vdfmodule.so. If either of these files is missing, or cannot be found because your user environment is not set up correctly, you will not be able to call the VAPOR provide IDL routines. IDL will issue a message along the lines of “Variable is undefined…”. The second reason VAPOR’s IDL routines may fail is if the version of IDL you are running is incompatible with the VAPOR provided IDL support libraries. If this is the case IDL will generate messages such as “Error loading sharable executable”. This condition can arise from trying to mix 32 and 64 bit binaries. Make sure both your IDL executable and VAPOR provided IDL support libraries are binary compatible.
