ASKSAGE: Sage Q&A Forum - Latest question feedhttp://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Thu, 26 May 2016 18:41:11 -0500Graphics array formattinghttp://ask.sagemath.org/question/33562/graphics-array-formatting/ I'm computing a number of plots (actually collections of 2d polygons) of roughly square aspect ratio, and would like to display them in a reasonable way:
* use two columns
* preserve order
* title each of them
* adjust the size to fill the width of my notebook, disregarding the height
First I displayed each graphics as it arrived, or combined bunches of them into `graphics_array` in order to show them. But my sage notebook (the classical one, not the IPython flavor) failed to preserve order in that case. So I feel that I have to build one big `graphics_array`.
But I've got trouble adjusting its width without specifying its height, and I don't know a suitable height up front. Most of the times if I specify one of the sizes too large, I end up with lots of empty space in one of the directions.
Furthermore, I didn't manage to title the individual graphics, since a `title` attribute to the `polygon2d` call remains without effect, while a `title` attribute to the `show` affects the whole plot and all the nested plots. Constructing an empty `Graphics(title="foo")` doesn't seem to work.
This is on sage 6.10.beta4, so things might have improved since then. If so, I haven't yet found the appropriate locations in the online documentation indicating how this changed.
If you want to try this out: I wanted to format the output of [this code](https://gist.github.com/gagern/e9606b3f12d53ff92c4541e1e7b51d6d) but using two columns and a varying number of rows for each *n*.MvGThu, 26 May 2016 18:41:11 -0500http://ask.sagemath.org/question/33562/Can I convert a GraphicsArray object to a Graphics object?http://ask.sagemath.org/question/7870/can-i-convert-a-graphicsarray-object-to-a-graphics-object/This is related to the [Plot titles](http://ask.sagemath.org/question/248/plot-titles) question about adding titles to plots. I'd like to add a title--or any descriptive text--to an image created as a `GraphicsArray` object, but a `GraphicsArray` is not a `Graphics` object, so the easy idea of adding a `text` graphic at the bottom or top doesn't work. Moreover, other things one might want to to with a `GraphicsArray` image also don't work. Looking at the source code for `GraphicsArray`, it seems that the `._render()` function is doing all the hard work, and creates (but doesn't return) a matplotlib `Figure` object. Try as I might, I can't see how to get a `Graphics` object out.
(Note: I have been able to successfully use `convert` to add text outside of sage, as mentioned in response to the "Plot titles" question, but I'd like an internal way to do it, and I think this would be a generally useful thing to do anyway.)
Here's an extended example:
var('t')
A = [plot(sin(t+k*pi/4),(-pi,pi)) for k in range(8)]
graphics_array(A,3,3)
results in
![array of sine plots](/upfiles/12951061095513203.png)
I would be content (for now) to add a `text` graphics object to this image, but trying
graphics_array(A,3,3) + text('hello world',(0,0), axes=False)
results in a `TypeError`.
Now one can add the `text` graphic to the end of the list of objects for the array, but this has a couple of problems:
A = [plot(sin(t+k*pi/4),(-pi,pi)) for k in range(8)] + [text('hello world',(0,0), axes=False)]
graphics_array(A,3,3)
![graphics array including text object](/upfiles/12951066584996643.png)
Note that:
* `axes=False` in the `text` object has no effect -- one can turn off axes for *all* of the graphics in the array, but not for just one
* it would be nice if the text were centered, spanning the width of the image (especially for a long caption, which might be wider than the individual images in the array)
* placement of the text frame is awkward if there are 9 images to start with . . . I guess I could prepend the text object to the array . . .
----
UPDATE: There are now two tickets for issues here:
[#10656: GraphicsArray() should be a Graphics() object, or have functionality to return one](http://trac.sagemath.org/sage_trac/ticket/10656)
[#10657: options for items in a GraphicsArray() should be set independently](http://trac.sagemath.org/sage_trac/ticket/10657)nilesSat, 15 Jan 2011 04:03:30 -0600http://ask.sagemath.org/question/7870/