Pref::alias
-- controls the output
of aliased expressionsPref::alias(
TRUE)
switches the usage of
alias
abbrevations in
outputs on.
Pref::alias(
FALSE)
switches the usage of
alias
abbrevations in
outputs off.
Pref::alias(
)
returns the current
setting.
Pref::alias()
Pref::alias(TRUE)
Pref::alias(FALSE)
Pref::alias(NIL)
the last defined value
Pref::alias
changes the output of aliased
expressions.
alias
, expr2text
, fprint
, print
alias
is an
abbrevation for a MuPAD expression. If Pref::alias
is enabled, the alias
abbrevations will be used for
output.Pref::alias(
)
returns the current
value.Pref::alias(
TRUE)
switches the usage of
alias
abbrevations in
outputs on. This is the default setting.Pref::alias(
FALSE)
switches the usage of
aliases in outputs off.Pref::alias(
NIL)
restores the default
value which is TRUE
.Pref::alias
has no effect on print
and fprint
.If an aliased expression occurs in output, it is replaced by the alias abbrevation:
>> alias(X = a + b): X, a + b
X, X
This only works if the syntactical structure of expression matches the aliased expression:
>> 2*X
2 a + 2 b
prog::exprtree
shows that
2*X
does not contain a + b
any more:
>> prog::exprtree(X): prog::exprtree(2*X):
_plus | +-- a | `-- b _plus | +-- _mult | | | +-- a | | | `-- 2 | `-- _mult | +-- b | `-- 2
The same holds for X+c
:
>> X + c; prog::exprtree(X + c):
a + b + c _plus | +-- a | +-- b | `-- c
With Pref::alias(
FALSE)
the
back translation of aliases in the output is disabled:
>> Pref::alias(FALSE): X
a + b
Pref::alias
has no effect on print
and fprint
outputs:
>> Pref::alias(TRUE): print(X):
a + b