READ MISSING VALUE (SET)
Specifies the value to be used when a missing value is
encountered with the array form of the COLUMN LIMITS
The January, 2004 version of Dataplot added support for
an array form of the COLUMN LIMITS command. This form is
used to specify the lower and upper columns to read for
each data field. One specific case this was intended to
handle was data files containing columns of unequal length.
This is a common occurence when Excel files are saved to
ASCII data files.
When the array form of the COLUMN LIMITS comamnd is used,
an empty field is interpreted as a missing value. By default,
Dataplot will assign a value of zero. If you want to assign
a value other than zero, use the SET READ MISSING VALUE command
to specify that value.
SET READ MISSING VALUE <value>
where <value> denotes the value to assign when an empty data
field is encoutered.
SET READ MISSING VALUE -999
SET READ MISSING VALUE 0
SET READ MISSING VALUE -1
This command only applies when the array form of the
COLUMN LIMITS command has been invoked. Otherwise, if the
number of values read is less than the number of variables
specified on the READ command, Dataplot treats this as an
= Carries out a column-wise input of data.
= Specify what columns to read.
SET READ MISSING VALUE -99
LET LOWLIM = DATA 1 11
LET UPPLIM = DATA 10 20
COLUMN LIMITS LOWLIM UPPLIM
READ DUMMY.DAT Y X
PLOT Y X SUBSET Y > -99 SUBSET X > -99
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Date created: 02/03/2004
Last updated: 11/04/2015
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