Editing Recap of the hierarchy of each plot element
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Octave aims at being compatible with Matlab as much as possible, so the graphics part is very similar too to Matlab. In Octave the first choice to make is the {{Codeline|graphics_toolkit ()}}. | Octave aims at being compatible with Matlab as much as possible, so the graphics part is very similar too to Matlab. In Octave the first choice to make is the {{Codeline|graphics_toolkit()}}. Standard is the 'gnuplot' toolkit using the [http://www.gnuplot.info Gnuplot] software package . The second choice is [http://www.fltk.org 'fltk']. You might want to try to test both of them for your plotting aims to see which solves your problem. | ||
You might want to try to test | |||
After the choice of the {{Codeline|graphics_toolkit('gnuplot')}} or {{Codeline|graphics_toolkit('fltk')}}, there is the following hierarchy to address when make/adapting your plot: | |||
* root | * root (any hierarchy needs to start somewhere) | ||
* figure: | * {{Codeline|gcf ()}} (the handle to your figure: one for every figure) | ||
* axes | * {{Codeline|gca ()}} (the handle to the axes inside a particular figure (several if you have subplots) | ||
* | * {{Codeline|<nowiki>p = plot (x, y)</nowiki>}} (p is the handle (inside the current axes handle) to the data, data symbols, data line thickness, etc) | ||
* | * {{Codeline|<nowiki>t = text (xlocation, ylocation, "some text")</nowiki>}} (t is the handle to the text and is a child of the current axes handle, like p) | ||
* {{Codeline|<nowiki>pp = patch ([x1 x2 x3 x4], [y1 y2 y3 y4], "r")</nowiki>}} (pp is the handle to a red patch using the coordinates inside the current axes handle) | |||
* | |||
Let's do an example: | |||
{{Code||<syntaxhighlight lang="octave" style="font-size:13px"> | {{Code||<syntaxhighlight lang="octave" style="font-size:13px"> | ||
graphics_toolkit (" | graphics_toolkit ("gnuplot"); | ||
x = 0:0.1:3; | x = 0:0.1:3; | ||
y = sin (x); | y = sin (x); | ||
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q = plot (x, x.^2, "k"); | q = plot (x, x.^2, "k"); | ||
* You now have 2 windows that popped up on your screen: figure 1 and figure 2. | * You now have 2 windows that popped up on your screen: figure 1 and figure 2. | ||
* figure 2 has two axes objects inside | * figure 2 has two axes objects inside: a {{Codeline|<nowiki>y = sin (x) .^2</nowiki>}} and a {{Codeline|<nowiki>y = x.^2</nowiki>}}. | ||
* the actual data and data-plot-properties are inside the handles {{Codeline|p}} and {{Codeline|r}}. | |||
So let's say you want to change the line thickness of the data in the first figure: | |||
figure (1) | figure (1) | ||
set (p, "linewidth", 3) | set (p, "linewidth", 3) | ||
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Which will give you the RGB code for black (0,0,0) and green (0,1,0). | Which will give you the RGB code for black (0,0,0) and green (0,1,0). | ||
Have a look at all the | Have a look at all the things you can change with: | ||
get (q) | get (q) | ||
And {{Codeline|set}} anything that is not to your taste to something else (for what's available see the [http://www.gnu.org/software/octave/doc/interpreter/ manual]). | And {{Codeline|set}} anything that is not to your taste to something else (for what's available see the [http://www.gnu.org/software/octave/doc/interpreter/ manual]). | ||
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Adding {{Codeline|text()}} inside an {{Codeline|axes()}} object is done by | Adding {{Codeline|text()}} inside an {{Codeline|axes()}} object is done by | ||
text (2, 0.8, "HERE"); | text (2, 0.8, "HERE"); | ||
... but it now is inserted in | ... but it now is inserted in figure1, which ''might NOT be want you anticipated''. | ||
The {{Codeline|text()}} command does ''not'' have the option to tell it in which figure or axes object to write the text. | |||
Make sure you have moved to current figure and axes ''before'' calling {{Codeline|text()}} to insert text: | |||
figure (2) % the following command will operate on figure(2) | |||
get (gcf (),"children") % which two axes objects are there inside the current figure ? | |||
set (gcf (), "currentaxes", (get (gcf (), "children"))(2)) % chose the second set of axes | |||
figure (2) | |||
set (gcf (), "currentaxes", | |||
text (1.0, 0.5, "THIS IS WHAT I WANTED") | text (1.0, 0.5, "THIS IS WHAT I WANTED") | ||