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sys/man/1/fplot
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57
sys/man/1/fplot
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.TH FPLOT 1
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.SH NAME
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fplot \- plot elementary function
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.SH SYNOPSYS
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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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.PP
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Each function to be plotted may be a combination of the independent variable x,
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the elementary operations (+, -, *, and /), and the functions described in
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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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fplot -c -s 400x400 'sqrt(x*x)' 'x^3' | page
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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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@ -57,6 +57,7 @@ void oasin(void) { *sp = asin(*sp); }
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void oacos(void) { *sp = acos(*sp); }
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void oatan(void) { *sp = atan(*sp); }
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void osqrt(void) { *sp = sqrt(*sp); }
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void oexp(void) { *sp = exp(*sp); }
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void olog(void) { *sp = log10(*sp); }
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void oln(void) { *sp = log(*sp); }
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@ -79,6 +80,7 @@ struct Operator {
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"acos", OUNARY, 0, 50, oacos,
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"atan", OUNARY, 0, 50, oatan,
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"sqrt", OUNARY, 0, 50, osqrt,
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"exp", OUNARY, 0, 50, oexp,
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"log", OUNARY, 0, 50, olog,
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"ln", OUNARY, 0, 50, oln,
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};
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