Syntax
where
The E: command is used to change current expectations
for the default expectation store. It cannot be used to introduce or
redefine an element name, and does not affect variance or covariance
specifications. It is an error to attempt to change the expectation
for an element which does not exist. The result of the command is to
change the expectation for each
are the names of elements, and
are valid
equations.
from what it was to the
value given by the equation 
. To change expectations for
otherv than the default expectation store, use the EXP:
command. To change the default expectation store, use the e
argument to the CONTROL: command.
=E 
=E 