PTOLEMY II - CiteSeerX

Expressions
from it. For instance,
>> 1-[3, 0; 0, 3]
[-2, 1; 1, -2]
A matrix can be checked for equality with another matrix as follows:
>> [3, 0; 0, 3]!=[3, 0; 0, 6]
true
>> [3, 0; 0, 3]==[3, 0; 0, 3]
true
For other comparisons of matrices, use the compare() function (see Table 5 on page 119). As with scalars,
testing for equality using the == or != operators tests the values, independent of type. For example,
>> [1, 2]==[1.0, 2.0]
true
To get type-specific equality tests, use the equals() method, as in the following examples:
>> [1, 2].equals([1.0, 2.0])
false
>> [1.0, 2.0].equals([1.0, 2.0])
true
>>
3.4.3 Records
A record token is a composite type containing named fields, where each field has a value. The
value of each field can have a distinct type. Records are delimited by curly braces, with each field
given a name. For example, “{a=1, b="foo"}” is a record with two fields, named “a” and “b”, with
values 1 (an integer) and “foo” (a string), respectively. The value of a field can be an arbitrary expression,
and records can be nested (a field of a record token may be a record token).
Fields may be accessed using the period operator. For example,
{a=1,b=2}.a
yields 1. You can optionally write this as if it were a method call:
{a=1,b=2}.a()
The arithmetic operators +, −, *, /, and % can be applied to records. If the records do not have identical
fields, then the operator is applied only to the fields that match, and the result contains only the fields
Heterogeneous Concurrent Modeling and Design 105