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axis equal help!
by pvfloripa
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Hi Everybody,
I am trying to plot a 3-D plot from several points. However, when I use the "axis equal" command, only the X and Y axis are set to the same scale, whereas Z doesn't change, making the plot look wrong. Is there any way around this? The same code works fine in Matlab. Many thanks! Paulo |
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Re: axis equal help!
by Ben Abbott
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On Aug 5, 2009, at 7:40 PM, pvfloripa wrote:
> Hi Everybody, > > I am trying to plot a 3-D plot from several points. However, when I > use the > "axis equal" command, only the X and Y axis are set to the same scale, > whereas Z doesn't change, making the plot look wrong. Is there any way > around this? > > The same code works fine in Matlab. > > Many thanks! > > Paulo Something like the following should work ... figure (1) clf surf (peaks) axis auto xl = get (gca, "xlim"); yl = get (gca, "ylim"); zl = get (gca, "zlim"); span = max ([diff(xl), diff(yl), diff(zl)]); xlim (mean (xl) + span*[-0.5, 0.5]) ylim (mean (yl) + span*[-0.5, 0.5]) zlim (mean (zl) + span*[-0.5, 0.5]) Ben _______________________________________________ Help-octave mailing list Help-octave@... https://www-old.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: axis equal help!
by John W. Eaton-3
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On 5-Aug-2009, Ben Abbott wrote:
| On Aug 5, 2009, at 7:40 PM, pvfloripa wrote: | | > Hi Everybody, | > | > I am trying to plot a 3-D plot from several points. However, when I | > use the | > "axis equal" command, only the X and Y axis are set to the same scale, | > whereas Z doesn't change, making the plot look wrong. Is there any way | > around this? | > | > The same code works fine in Matlab. | > | > Many thanks! | > | > Paulo | | Something like the following should work ... | | figure (1) | clf | surf (peaks) | axis auto | xl = get (gca, "xlim"); | yl = get (gca, "ylim"); | zl = get (gca, "zlim"); | span = max ([diff(xl), diff(yl), diff(zl)]); | xlim (mean (xl) + span*[-0.5, 0.5]) | ylim (mean (yl) + span*[-0.5, 0.5]) | zlim (mean (zl) + span*[-0.5, 0.5]) Does 3d plotting in gnuplot have a way to specify equal axes? The docs for the version I have (4.2.5) say that "set size ratio" has no effect for 3d plots, and that's what we are currently using to get equal axes. jwe _______________________________________________ Help-octave mailing list Help-octave@... https://www-old.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: axis equal help!
by Ben Abbott
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On Aug 5, 2009, at 8:28 PM, John W. Eaton wrote: > On 5-Aug-2009, Ben Abbott wrote: > > | On Aug 5, 2009, at 7:40 PM, pvfloripa wrote: > | > | > Hi Everybody, > | > > | > I am trying to plot a 3-D plot from several points. However, > when I > | > use the > | > "axis equal" command, only the X and Y axis are set to the same > scale, > | > whereas Z doesn't change, making the plot look wrong. Is there > any way > | > around this? > | > > | > The same code works fine in Matlab. > | > > | > Many thanks! > | > > | > Paulo > | > | Something like the following should work ... > | > | figure (1) > | clf > | surf (peaks) > | axis auto > | xl = get (gca, "xlim"); > | yl = get (gca, "ylim"); > | zl = get (gca, "zlim"); > | span = max ([diff(xl), diff(yl), diff(zl)]); > | xlim (mean (xl) + span*[-0.5, 0.5]) > | ylim (mean (yl) + span*[-0.5, 0.5]) > | zlim (mean (zl) + span*[-0.5, 0.5]) > > Does 3d plotting in gnuplot have a way to specify equal axes? The > docs for the version I have (4.2.5) say that "set size ratio" has no > effect for 3d plots, and that's what we are currently using to get > equal axes. > > jwe I think there is a simple fix for gnuplot >4.3 (using the approach I outlined above). I haven't looked into the older gnuplot yet. However, I noticed that demo("axis",6) produces an error. I don't have the time to dig into that right now. Ben _______________________________________________ Help-octave mailing list Help-octave@... https://www-old.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: axis equal help!
by John W. Eaton-3
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On 5-Aug-2009, Ben Abbott wrote:
| I think there is a simple fix for gnuplot >4.3 (using the approach I | outlined above). I haven't looked into the older gnuplot yet. | | However, I noticed that demo("axis",6) produces an error. I don't see an error message and the plot it generates looks OK to me (but maybe it is wrong and I don't understand how the plot is intended to appear). What is the problem you see? jwe _______________________________________________ Help-octave mailing list Help-octave@... https://www-old.cae.wisc.edu/mailman/listinfo/help-octave |
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Re: axis equal help!
by pvfloripa
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Hi all,
Thanks for all your replies. The problem I see is that, say I have 3 line segments that form the sketch of a door, defined by 6 points: point1 = [ 0 0 0] point2 = [ 0 0 2] point3 = [ 0 0 2] point4 = [ 1 0 2] point5 = [ 1 0 2] point6 = [ 1 0 0] which correspond to the sides (points 1,2 and 5,6) and the top ( points 3,4) of the door. Instead of seeing the door in the correct proportion (ie, the height 2x the width), I see a very tall and very thin door. I will try the solutions suggested and let you know. Thanks again, Paulo
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Re: axis equal help!
by Ben Abbott
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On Aug 5, 2009, at 10:26 PM, John W. Eaton wrote: > On 5-Aug-2009, Ben Abbott wrote: > > | I think there is a simple fix for gnuplot >4.3 (using the approach I > | outlined above). I haven't looked into the older gnuplot yet. > | > | However, I noticed that demo("axis",6) produces an error. > > I don't see an error message and the plot it generates looks OK to > me (but maybe it is wrong and I don't understand how the plot is > intended to appear). What is the problem you see? > > jwe You are correct. I deleted my axis.m and pulled a fresh copy, and the error is gone. Ben _______________________________________________ Help-octave mailing list Help-octave@... https://www-old.cae.wisc.edu/mailman/listinfo/help-octave |
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