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MathGroup Archive 2001

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Re: How can I creat a user coordinate system for my routine?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg27020] Re: How can I creat a user coordinate system for my routine?
  • From: Brian Higgins <bghiggins at ucdavis.edu>
  • Date: Tue, 30 Jan 2001 23:22:36 -0500 (EST)
  • References: <94r8bq$ii1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com


Liven,

One approach is to modify the arguments of the graphic primitive used to
plot the graph. For example, in Plot the graphic primitive is Line. Thus
applying a replacement rule on the arguments of Line after the plot has
been rendered will reflect the plot about the y axis.
Here is an example:

Show[Plot[Sin[x], {x, 0, 2\[Pi]},
      DisplayFunction -> Identity] /. {x_, y_} -> {-x, y},
  DisplayFunction -> $DisplayFunction]

Cheers,

Brian



 liwen liwen <gzgear at yahoo.com> wrote:
> Dear friend,
> In mathematica4,the default coordinate system is world
> coordinate system(WCS),for example,on the XOY
> plane,the point pt={10,0} is on the right side of
> original poins {0,0}.Now I want to turn the WCS to be
> a user coordinate system(UCS) in which the direction
> of the Y axis is not changed but that of X axis is
> reversed,what should I do?The UCS must be created
> before running my routines because my routines are
> based on the the UCS but not WCS.
>
>  Best Regards,
>                 Liwen    1/26/2001
>
> __________________________________________________
> Do You Yahoo!?
> Yahoo! Auctions - Buy the things you want at great prices.
> http://auctions.yahoo.com/
>


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