#5956: image dimensions for show() are in inches
----------------------+-----------------------------------------------------
Reporter: mvngu | Owner: was
Type: defect | Status: new
Priority: minor | Milestone: sage-4.0
Component: graphics | Keywords: image dimensions, figsize
----------------------+-----------------------------------------------------
As discussed at this [http://groups.google.com/group/sage-
devel/browse_thread/thread/c411254b7bc0bb97 sage-devel thread], the
optional argument {{{figsize}}} of the command {{{show()}}} needs to
clearly state that the units of the image are in inches. As of Sage 3.4.1,
the docstring for {{{show()}}} says:
{{{
- ``figsize``- [width, height] (same for square aspect)
}}}
which can be interpreted to mean that one can do something like
{{{figsize=[w,h]}}}. But something like the following produces a
segmentation fault:
{{{
[mv...@sage ~]$ sage
----------------------------------------------------------------------
| Sage Version 3.4.1, Release Date: 2009-04-21 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: q = var("q")
sage: f(q) = (q^4 - q^2 + 1) * (q^4 + q^3 + q^2 + q + 1) * (q^4 - q^3 \
+ q^2 - q + 1) * (q^6 + q^5 + q^4 + q^3 + q^2 + q + 1) * (q^6 - q^5 + \
q^4 - q^3 + q^2 - q + 1) * (q^(20) - q^(18) - q^(14) - q^(12) + q^(10) \
- q^8 - q^6 - q^2 + 1)
sage: g(q) = q^8 * (q^4 + q^2 + 1)^2 * (q^4 + 1)^5
sage: p = complex_plot(f/g, (-2,2), (-2,2))
sage: p.show(figsize=[256,256])
}}}
while the following results in a {{{ValueError}}}:
{{{
----------------------------------------------------------------------
| Sage Version 3.4.1, Release Date: 2009-04-21 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: q = var("q")
sage: f(q) = (q^4 - q^2 + 1) * (q^4 + q^3 + q^2 + q + 1) * (q^4 - q^3 \
+ q^2 - q + 1) * (q^6 + q^5 + q^4 + q^3 + q^2 + q + 1) * (q^6 - q^5 + \
q^4 - q^3 + q^2 - q + 1) * (q^(20) - q^(18) - q^(14) - q^(12) + q^(10) \
- q^8 - q^6 - q^2 + 1)
sage: g(q) = q^8 * (q^4 + q^2 + 1)^2 * (q^4 + 1)^5
sage: p = complex_plot(f/g, (-2,2), (-2,2))
sage: p.show(figsize=[500,500])
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
...
ValueError: width and height must each be below 32768
}}}
Essentially, the documentation for {{{show()}}} needs to be updated,
especially the optional arguments, to clearly explain the units of
measurement of the width and height of the image size. Also, it would be a
good idea to specify how one can pass in values for those dimensions. For
example, can one do this {{{figsize=[124,124]}}}?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5956>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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