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# gnuplot (1)
```
# Launch interactive shell.
gnuplot
# Launch interactive shell.
gnuplot [opt]
opt:
-p ................ persist plot window
-c <file> ......... run script file
-e "<cmd1>; .." ... run cmd(s)
```
## Frequently used configuration
```sh
# Plot title.
set title "the plot"
# Labels.
set xlabel "abc"
set ylabel "def"
# Output format, 'help set term' for all output formats.
set term svg
# Output file.
set output "out.svg"
# Make axis logarithmic to given base.
set logscale x 2
# Change separator, default is whitespace.
set datafile separator ","
```
## Plot
```sh
# With specific style (eg lines, linespoint, boxes, steps, impulses, ..).
plot "<data_file>" with <plot_style>
> cat data.txt
1 1 3
2 2 2
3 3 1
4 2 2
# Plot specific column.
plot "data.txt" using 1:2, "data.txt" using 1:3
# Equivalent using the special file "", which re-uses the previous input file.
plot "data.txt" using 1:2, "" using 1:3
# Plot piped data.
plot "< head -n2 data.txt"
# Plot with alternate title.
plot "data.txt" title "moose"
```
## Example: multiple data sets in plot
```sh
{{#include gnuplot/mem_lat.plot}}
```
On Linux x86_64, [`mem_lat.c`](gnuplot/mem_lat.c) provides an example which can
be run as follows.
```sh
{{#include gnuplot/plot.sh:3:9}}
```
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