Using GnuplotRB in IRuby notebooks¶
GnuplotRB plots may be embedded into iRuby notebooks as images (terminals svg, png, jpeg and pngcairo are supported) or plain text (dumb terminal). By default GnuplotRB will use svg:
In [1]:
require 'gnuplotrb'
include GnuplotRB
simple_plot = Plot.new(
['x*sin(x)', with: 'lines', lt: { rgb: 'blue', lw: 3 }],
xrange: -10..10,
title: 'Math function example',
ylabel: 'x',
xlabel: 'x*sin(x)'
)
Out[1]:
You can make GnuplotRB plots to be rendered into other formats using term option:
In [2]:
simple_plot.term('png')
Out[2]:
In [3]:
simple_plot.term('jpeg')
Out[3]:
In [4]:
simple_plot.term('dumb')
Out[4]:
Math function example
8 +-+---------------+-----------------+----------------+---------------+-+
+ + + + + + + + +
6 +-+ + + x*sin(x)++-----+-+
| + + + + |
| | + + | |
4 +-+ + | | + +-+
| | + + | |
2 +-++ + + ++-+
| | | ++++++ ++++++ | | |
| + + + +++ +++ + + + |
0 +-+ | + ++++ + | +-+
|| + + + + ||
-2 +-+ + + + + +-+
|| + + + + ||
|+ + + + + +|
-4 +-+ ++ ++ ++ ++ +-+
+ + + + +
-6 +-+---------------+-----------------+----------------+---------------+-+
-10 -5 0 5 10
x*sin(x)
Using terminal options¶
To specify some image params like canvas size or font you can pass options to term:
In [5]:
simple_plot.term('dumb', size: [60,30])
Out[5]:
Math function example
8 +-+----------+------------+------------+----------+-+
+ + + + + + + + +
| | + x*sin(x) +-----+ |
6 +-+ + | | + +-+
| | + + | |
| + | | + |
| | + + | |
4 +-++ | | ++-+
| | + + | |
| | | | | |
2 +-+ + +++ +++ + +-+
| | | + ++ ++ + | | |
| | + + ++ ++ + + | |
0 +-+ | + +++ + | +-+
| | + + + + | |
|| | + + | ||
-2 +-+ + | | + +-+
|| | + + | ||
|| + + + + ||
|+ + + + + +|
-4 +-+ + + + + +-+
| ++ ++ |
+ + + + +
-6 +-+----------+------------+------------+----------+-+
-10 -5 0 5 10
x*sin(x)
In [6]:
simple_plot.term('svg', fsize: '18')
Out[6]:
Of course plot may be created with term option already set:
In [7]:
Splot.new(
['sin(u)*cos(v), sin(u)*sin(v), cos(u)', title: 'Sphere'],
parametric: true,
urange: 0..Math::PI,
vrange: 0..2*Math::PI,
title: 'sphere',
hidden3d: true,
isosamples: 30,
term: ['png', size: [600, 800]]
)
Out[7]:
