The usage of calc is
stilts <stilts-flags> calc table=<table>
[expression=]<expr>
If you don't have the stilts script installed,
write "java -jar stilts.jar" instead of
"stilts" - see Section 3.
The available <stilts-flags> are listed
in Section 2.1.
For programmatic invocation,
the Task class for this
command is uk.ac.starlink.ttools.task.Calc.
Parameter values are assigned on the command line as explained in Section 2.3. They are as follows:
expression = <expr> (String)
table = <table> (StarTable)
expression is evaluated.
This parameter is optional, and will usually not be required;
its only purpose is to allow use of constant expressions
(table parameters) associated with the table.
These can be referenced using identifiers of the form
param$*,
ucd$* or
utype$* -
see Section 10.2 for more detail.