READ command

Syntax: | `READ file{/line_range} x1{/c1} { x2{/c2} ... } READ\SCALARS file{/n} s1{/c1} { s2{/c2} ... } READ\MATRIX file{/n} matrix nrows { ncols } READ\TEXT file{/line_range} txtvar`
Qualifiers: | `\VECTORS, \SCALARS, \MATRIX, \TEXT, \CLOSEFIRST, \CLOSEAFTER, \MESSAGES`
Defaults: | `\VECTORS, \CLOSEFIRST, \CLOSEAFTER, \MESSAGES`

By default, the file, assumed to be in ASCII format, is closed after reading, and a subsequent `READ` command of the same file will start reading at the first record. If the `\-CLOSEAFTER` qualifier is used, the file will be not closed after reading, so that the next `READ` operation of the same file will begin reading at the next record. If the `\CLOSEFIRST` qualifier is used, the file will be closed first and then reopened before reading, so the `READ` operation will begin at the first record.

By default, informational messages are displayed in the message area. If the `\-MESSAGES`, qualifier is used, these messages will not be displayed.

Read vectors
Read scalars