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horos22
USA
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 Posted - 04/14/2005 : 7:37:41 PM
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Origin Version (Select Help-->About Origin): 7.5
Operating System: Windows 2000
hey all,
I had a question about coordinate systems.
I see the list of coordinate systems (linear logit, etc) - I was wondering if you could
do a custom one.
For example, a mercator projection, like:
http://www.originlab.com/index.aspx?s=9&lm=+154&pid=764
does not actually have a linear scale on the y axis, but gets more elongated as the latitudes approach 90 degress, as in:
http://en.wikipedia.org/wiki/Image:Mercator-proj.jpeg
Is there any way to tell origin that you are using a non-standard x or y axis, and to give a transform so that the coordinates aren't evenly spaced, or are spaced via a function?
Thanks much,
Ed
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ps - is there any easy way to just plot a function on origin? ex - how would you make a function y == x^2 + 2x?
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horos22
USA
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Posted - 04/14/2005 : 8:59:19 PM
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ps - I see that the graph in question is either a mollweide or gall orthographic, so it is indeed correct... but I'd still like to know how to do mercator projections correctly..
Ed |
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Mike
USA
357 Posts |
Posted - 04/15/2005 : 09:03:25 AM
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Ed, I don't know whether this helps you or not, but you might want to take a look at "Method II" described in this k-base item.
You can plot a function in Origin. For more information, please see the Help file chapter The Graph: Basics > Plotting Functions.
Mike
OriginLab |
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horos22
USA
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Posted - 04/15/2005 : 9:08:27 PM
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ps - just curious...
but could you make two x-axes, and then make one of them invisible? Then you could use the method that you described to 'fake' a customer axis system..
Ed
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Edited by - horos22 on 04/16/2005 12:27:38 AM |
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Mike
USA
357 Posts |
Posted - 04/18/2005 : 09:07:24 AM
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Ed,
For the "how to" on hiding graph axes, see the Help file (Help:Origin) topic:
The Graph: Axes> Axis Scale and Tick Mark Format> Turning On and Off the Display of the Axes
Mike
OriginLab |
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non - standard coordinate systems