HP 3000 Manuals HP 3000 Manuals
MAT READ
The MAT READ statement assigns values from one or more DATA statements or
a data file to one or more arrays. If new dimensions are specified for
the arrays, the MAT READ statement redimensions them before assigning
values to them. It assigns values element by element, varying the
rightmost subscript fastest. The MAT READ statement cannot take input
from the terminal keyboard.
Syntax
MAT READ [#fnum[,rnum[,wnum]];] array [dims][, array [dims]]...
Parameters
fnum File number of a data file. If this parameter is
specified, the MAT READ statement reads from a data
file. If it not specified, the MAT READ statement reads
from DATA statements. A program line can read from a
DATA statement or a file, and a command can only read
from a file. For more information on fnum, see "File
Identification," in chapter 6.
rnum Record number. If this parameter is specified, the
statement performs a direct read on the data file
specified by fnum. For more information on rnum and
direct reads, see "File Input and Output," in chapter 6.
wnum Word number. If this parameter is specified, the
statement performs a direct word read on the file
specified by fnum. That file must be a BASIC DATA file.
For more information on rnum and direct word reads, see
"File Input and Output," in chapter 6.
array Structured collection of variables of the same type.
The structure is determined when the array is declared.
String variables names are suffixed with a "$".
dims Array dimensions used in syntax specification
statements. Its syntax is
(dim1[,dim2[,dim3[,dim4[,dim5[,dim6]]]]])
where dim1 through dim6 each have the syntax
[num_expr1:]num_expr2
and num_expr1 and num_expr2 are the lower and upper
bounds (respectively) of the dimension. If num_expr1 is
not specified, it is the default lower bound.
Examples
The following examples show the MAT READ statement. Each reads a group
of arrays into array variables. In lines 100 and 120, the entire arrays
are read, and in lines 110 and 130 selected elements are read.
100 MAT READ #1; A,B,C$
110 MAT READ #2; A(1:3),B(0:4,0:6),C$(3,4,5,6)
120 MAT READ #1,7; D$
130 MAT READ #4,6,2; Q,P(9,9),R
If array A has four elements, the following statements are equivalent:
100 MAT READ #1; A
100 READ #1; A(*)
100 READ #1; A(1),A(2),A(3),A(4)
100 READ #1; (FOR I=1 TO 4, A(I))