Only nodal output variable keys that are valid for results file output in
the current step are available for use with GETVRN. In general, if a key corresponds to a collective output
variable, rather than an individual component, it can be used with GETVRN. For example, U for displacement can be used, whereas any individual component
of displacement, say U1, cannot be used. The collective output variable keys are
distinguished from their individual components by the fact that they have
the word "yes" after the category
.fil in the tables in
Nodal variables.
You will be returned ARRAY, which corresponds
to the real-valued components associated with the request
VAR. If any array component is not applicable
for a given request, its value will be returned as the initialized value: 0.0.
The error flag JRCD=1 is returned from GETVRN any time a request key is not recognized, the request is not
valid (such as requesting pore pressure for a node not associated with a pore
pressure or acoustic element, or requesting a variable not available for the
current procedure), or all of the output components requested are zero;
otherwise, JRCD=0.