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Shorthand notation for functions in editorial computing

Names of functions can be abbreviated by giving a substitution
specification of the form <new_name>()=<original_name>().
Example:
P()=N.F()
P(0,1,1)=0.84134474606854

This option is especially useful when referring to matrix elements
(MAT_) or data items (DAT_).
Examples:
D()=DAT_G:\E\U\D\FINLAND()
D(Helsinki,Popul)=483057  D(Helsinki,Area)=176.87

After REGDIAG (see REGDIAG?):
M()=MAT_RG.M()
M(SSE)+M(SSR)=1228203.9791665
       M(SST)=1228203.9791665