On Mon, Sep 29, 2008 at 2:22 PM, John H Palmieri <[EMAIL PROTECTED]> wrote:
>
> I don't understand aspect_ratio for 3d plots, or maybe there are bugs.
> If I do (from the notebook interface)
>
> sage: var('x y')
> sage: Q = plot3d(sin(x+y), (-3,3), (-2,2))
> sage: Q.show()
>
> then I get a nice picture, with a labeled frame showing x going from
> -3 to 3, y from -2 to 2, z from -1 to 1. The different axes are scaled
> differently, so that (for example) the x and y axes have the same
> length. Also,
>
> sage: Q.show(aspect_ratio=[1,1,1])
>
> works as expected: the variables are displayed in the appropriate
> ranges, and the axes seem to all be scaled the same. But if I do
>
> sage: Q.show(aspect_ratio=[1,1,2])
>
> then I get a picture with a labeled frame showing x going from -3 to
> 3, y going from -4 to 4 (!), z going from -2 to 2 (!), the x and z
> axes scaled the same, and the y-axis is at about half the scale of the
> x-axis. This is not at all what I expected; I was thinking that
> [1,1,2] would mean that the z-axis would be doubled (or maybe halved)
> in scale, compared to the other two.
>
> I'm puzzled; can anyone explain this? The documentation for
> aspect_ratio in show says
>
> (default: "automatic") -- aspect ratio of the coordinate system itQ.
> Give [1,1,1] to make spheres look round.
>
> This is not helpful to me. (And what does itQ mean? Is it a typo? Oh,
> I see, it should have said "itself", but "self" got replaced by "Q".)
Try frame_aspect_ratio, which is probably what you really want
given your questions.
William
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