Matrix Elements VB-800 Instrukcja Użytkownika Pobierz pdf (Strona 161)

A7.2 Comparison 153

A7.2.4 Types

Gauss primarily has a matrix type. Ox is implicitly typed, and has the fol-

lowing types: integer, double, matrix,

string, array, ﬁle, function, class. Type is

determined at run time (and can change at

run time). E.g. a=1; creates an integer,

a=1.0; a double and a=<1>; amatrix.

A7.2.5 Matrix indexing

Indexing starts at 1, so m[1,1] is the ﬁrst

element in a matrix. Vectors only need

one index. A matrix can be indexed by a

single index, a list of numbers, or an ex-

pression evaluating to a vector or matrix

(in which case no spaces are allowed). A

dot indicates all elements, for example:

w[1,1]

w[2:5,3:6]

w[1 3:4,.]

w[a+b,c]

Indexing starts at 0, so m[0][0] is the

ﬁrst element in a matrix. Ox can be made

to start indexing at 1; this will lead to a

somewhat slower program. Vectors only

need one index. A matrix can be indexed

by a single index, a list of numbers, or

an expression evaluating to a vector or

matrix (including matrix constants) or a

range. The upper or lower index in a

range may be omitted. A empty index in-

dicates all elements, for example:

w[0][0]

w[1:4][2:5]

w[<0,2:3>][]

w[a + b][c]

w[:4][2:]

A7.2.6 Arrays

Gauss implements arrays using the varput

and varget function.

The array is a type in Ox, e.g. {"one",

"two", <1,2>} is an array constant,

where the ﬁrst two elements are a string,

and the last a matrix. To print these:

print(a[0], a[1], a[2]).Anewar-

ray is created with the new operator.

1 2 ... 156 157 158 159 160 161 162 163 164 165 166 ... 171 172

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