HISTOGRAM(8)

NAME

histogram − draw a histogram

SYNOPSIS

histogram [ -h ] [ -c index ] [ -r minx,miny,maxx,maxy ] [ -s scale ] [ -t title ] [ -v maxv ]

DESCRIPTION

Histogram reads numbers, one per line, from its standard input and draws them as bars in a histogram.

Use -c to set the color index for the graph. A modulus operation on the value keeps the color index within the available range.

Unless -h (hold) is given, histogram will exit when it reaches the end-of-file. It will exit immediately if it is interrupted or if the exit menu option is chosen.

-r sets the initial window rectangle coordinates.

-s sets the scaling factor.

-t sets the title displayed on a line above the histogram. The last value read is displayed to the right of the title.

-v sets the maximum value that can be expected.

EXAMPLE

Plot a sine wave:

hoc -e ’for(i=0.0;i<20∗PI;i=i+0.1) print (10+10∗sin(i)), "\n"’|
histogram -t ’sin(t), 0 ≤ t ≤ 20π’ -v 20 -h

Show the Dow Jones adjusted daily closing price back to January 1, 2000:

site=http://ichart.finance.yahoo.com
hget $site’/table.csv?s=^DJI&a=00&b=1&c=2000’ |
awk -F, ’{print $NF}’ | histogram -t DJI -v 15000 -h

SOURCE

/sys/src/cmd/histogram.c

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