gnuplot documentation

70 gnuplot 4.3 60 PLOT
# is translated via origin.
plot ’’ binary array=512x1024:1024x512 format=’%uchar’ \
dx=2:1 dy=1:2 origin=(0,0):(1024,1024) flipy u 1:2:3 w rgbimage
# Four separate records in which the coordinates are part of the
# data file. The file was created with a endianess different from
# the system on which gnuplot is running.
splot ’’ binary record=30:30:29:26 endian=swap u 1:2:3
See also binary matrix (p. 151).
60.2.3 Every
The every keyword allows a periodic sampling of a data set to be plotted.
In the discussion a "point" is a datum defined by a single record in the file; "block" here will mean the
same thing as "datablock" (see glossary (p. 31)).
Syntax:
plot ’file’ every {}
{:{}
{:{}
{:{}
{:{}
{:}}}}}
The data points to be plotted are selected according to a loop from to
with increment and the blocks according to a loop from to
with increment .
The first datum in each block is numbered ’0’, as is the first block in the file.
Note that records containing unplottable information are counted.
Any of the numbers can be omitted; the increments default to unity, the start values to the first point
or block, and the end values to the last point or block. If every is not specified, all points in all lines
are plotted.
Examples:
every :::3::3
every :::::9
every 2:2
every ::5::15
# selects just the fourth block (’0’ is first)
# selects the first 10 blocks
# selects every other point in every other block
# selects points 5 through 15 in each block
See
,
, and
.
simple plot demos (simple.dem)
Non-parametric splot demos
Parametric splot demos
60.2.4 Example datafile
This example plots the data in the file "population.dat" and a theoretical curve:
pop(x) = 103*exp((1965-x)/10)
plot [1960:1990] ’population.dat’, pop(x)
The file "population.dat" might contain: