gnuplot documentation
gnuplot documentation
gnuplot documentation
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62 <strong>gnuplot</strong> 4.3 57 LOAD<br />
hi !reread<br />
# execute last entry starting with "reread"<br />
hist !"set xr" # like above, several words enclosed in quotes<br />
hi !hi # guess yourself :-))<br />
On systems which support a popen function (Unix), the output of history can be piped through an<br />
external program by starting the file name with a ’|’, as one of the above examples demonstrates.<br />
56 If<br />
The if command allows commands to be executed conditionally.<br />
Syntax:<br />
if () [; else if () ...; else ...]<br />
will be evaluated. If it is true (non-zero), then the command(s) of the <br />
will be executed. If is false (zero), then the entire is ignored until the<br />
next occurrence of else. Note that use of ; to allow multiple commands on the same line will not end<br />
the conditionalized commands.<br />
Examples:<br />
pi=3<br />
if (pi!=acos(-1)) print "?Fixing pi!"; pi=acos(-1); print pi<br />
will display:<br />
?Fixing pi!<br />
3.14159265358979<br />
but<br />
if (1==2) print "Never see this"; print "Or this either"<br />
will not display anything.<br />
else:<br />
v=0<br />
v=v+1; if (v%2) print "2" ; else if (v%3) print "3"; else print "fred"<br />
(repeat the last line repeatedly!)<br />
See reread (p. 83) for an example of how if (p. 62) and reread (p. 83) can be used together to<br />
perform a loop.<br />
57 Load<br />
The load command executes each line of the specified input file as if it had been typed in interactively.<br />
Files created by the save command can later be loaded. Any text file containing valid commands can<br />
be created and then executed by the load command. Files being loaded may themselves contain load<br />
or call commands. See comments (p. 23) for information about comments in commands. To load<br />
with arguments, see call (p. 54).<br />
The load command must be the last command on a multi-command line.<br />
Syntax:<br />
load ""<br />
The name of the input file must be enclosed in quotes.<br />
The special filename "-" may be used to load commands from standard input. This allows a <strong>gnuplot</strong><br />
command file to accept some commands from standard input. Please see help for batch/interactive<br />
(p. 22) for more details.<br />
On some systems which support a popen function (Unix), the load file can be read from a pipe by<br />
starting the file name with a ’
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