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- Function: %TH (i)
-
is the ith previous computation. That is, if the next
expression to be computed is D(j) this is D(j-i). This is useful in
BATCH files or for referring to a group of D expressions. For
example, if SUM is initialized to 0 then FOR I:1 THRU 10 DO
SUM:SUM+%TH(I) will set SUM to the sum of the last ten D expressions.
- operator: "'"
-
- (single quote) has the effect of preventing evaluation. E.g.
'(F(X)) means do not evaluate the expression F(X). 'F(X) means
return the noun form of F applied to [X].
- operator: """
-
- (two single quotes) causes an extra evaluation to occur. E.g.
"c4; will re-execute line C4. "(F(X)) means evaluate the
expression F(X) an extra time. "F(X) means return the verb form of F
applied to [X].
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