2015-11-29 23:06:55 +00:00
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.TH FPLOT 1
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2012-11-05 17:38:39 +00:00
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.SH NAME
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fplot \- plot elementary function
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2018-03-20 17:24:26 +00:00
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.SH SYNOPSIS
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2012-11-05 17:38:39 +00:00
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.B fplot
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[
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.B -c
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[
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.B -s
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.I size
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]] [
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.B -r
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.I range
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]
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.I functions ...
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.SH DESCRIPTION
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.I Fplot
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plots elementary
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.I functions
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separated by spaces. The default output is the screen, but if the
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.B -c
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option is specified, the plot is written to the standard output as an r8g8b8
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.IR image (6).
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The latter image size is either 640x480 or the one specified by the
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.B -s
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option's argument (in the WIDTHxHEIGHT format). The
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.B -r
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option accepts as argument the x and y ranges, in the format
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.LR "xmin:xmax ymin:ymax".
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2018-05-20 09:14:16 +00:00
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By default
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.I fplot
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draws coordinate axes and tick marks; the
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.B -a
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option inhibits this.
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2012-11-05 17:38:39 +00:00
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.PP
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Each function to be plotted may be a combination of the independent variable x,
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2015-02-05 18:55:46 +00:00
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the elementary operations (+, -, *, / and %), and the functions described in
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2012-11-05 17:38:39 +00:00
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.IR sin (2)
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and
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.IR exp (2).
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The exception being that x^n raises x to the nth power, log is the base 10 logarithm,
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and ln is the natural logarithm.
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.SH EXAMPLES
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Plot the absolute value and x^3 functions to a 400x400 image(6) on standard output and view with
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.IR page (1).
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.IP
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.EX
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2020-11-27 09:35:57 +00:00
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fplot -c -s 400x400 'abs(x)' 'x^3' | page
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2012-11-05 17:38:39 +00:00
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.EE
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.SH SOURCE
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.B /sys/src/cmd/fplot.c
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.SH SEE ALSO
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.IR exp (2),
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.IR sin (2),
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.IR image (6),
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.IR plot (1).
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.SH DIAGNOSTICS
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.I Fplot
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either exits with
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.LR "syntax error"
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or an empty status.
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2015-11-27 21:49:19 +00:00
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.SH BUGS
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There is no unary plus or minus.
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2018-05-20 09:14:16 +00:00
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.PP
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Axes are not drawn in
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.B -c
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output.
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2013-12-27 21:22:05 +00:00
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.SH HISTORY
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.I Fplot
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first appeared in 9front (July, 2011).
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