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3.5.2 Special characters
The following characters and operators have special meanings:
=
-
assignment
{ , }
-
parentheses for block programming
( , )
-
in expressions, for indexed names and for argument lists
[ , ]
-
access operator for strings, integer vectors, ideals, matrices,
polynomials, resolutions, and lists. Used to build vectors of
polynomials. Example:
s[3] , m[1,3] , i[1..3] ,
[f,g+x,0,0,1] .
+
-
addition operator
++
-
increment operator
-
-
subtraction operator
--
-
decrement operator
*
-
multiplication operator
/
-
division operator. See Miscellaneous oddities, for the difference
between the division operators
/ and div .
%
-
modulo operator (
mod is an alias to % ): result is always non-negative
^ or **
-
exponentiation operator
==
-
comparison operator equal
!= or <>
-
comparison operator not equal
>=
-
comparison operator larger than or equal to
>
-
comparison operator larger
<=
-
comparison operator smaller than or equal to
<
-
comparison operator smaller. Also used for file input. See filecmd.
!
-
boolean operator not
&&
-
boolean operator and
||
-
boolean operator or
"
-
delimiter for string constants
`
-
delimiter for name substitution
?
-
synonym for
help
//
-
comment delimiter. Comment extends to the end of the line.
/*
-
comment delimiter. Starts a comment which ends with
*/ .
*/
-
comment delimiter. Ends a comment which starts with
/* .
;
-
statement separator
,
- separator for expression lists and function arguments
\
-
escape character for
" and \ within strings
..
-
interval specifier returning intvec.
E.g.,
1..3 which is equivalent to the intvec 1, 2, 3 .
:
-
repeated entry.
E.g.,
3:5 generates an intvec of length 5 with constant entries 3, i.e., (3, 3, 3, 3, 3).
::
-
accessor for package members.
E.g.,
MyPackage::i accesses variable i in package MyPackage .
_
-
value of expression displayed last
~
-
breakpoint in procedures
#
-
list of parameters in procedures without explicit parameter list
$
-
terminates SINGULAR
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