Maxima Manual. Node: Introduction to Command Line Command Line
Command Line
Definitions for Command Line
22.1: Introduction to Command Line
 Function: %TH
(i)

is the ith previous computation. That is, if the next
expression to be computed is D(j) this is D(ji). 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 reexecute 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].
Command Line
Command Line
Definitions for Command Line