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MathGroup Archive 2001

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RE: 1. Input of screen coordinates; 2. Fast graphics

  • To: mathgroup at smc.vnet.net
  • Subject: [mg26967] RE: [mg26953] 1. Input of screen coordinates; 2. Fast graphics
  • From: Manuel Arala Chaves <machaves at fc.up.pt>
  • Date: Tue, 30 Jan 2001 03:38:18 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

David,

Thank you very much for your prompt reply to my questions.
Concerning my second question, well, I had completely forgotten about the
existence of Raster which I think I never used. It is precisely what I
need, and  -  NO, I do not find 3.51 sec. too slow...

Concerning my first question, I did not know that CTR+click would write
the coordinates to the clipboard and I could find no reference to that in
the Mathematica Book. But I already tried and it worked.

Best regards
Manuel

On Sun, 28 Jan 2001, David Park wrote:

> Manuel,
> 
> You can click off points from a plot and copy them.
> 1) Click on the plot to select it.
> 2) Hold down Ctrl and then click of the series of points that you want to
> copy.
> 3) Then copy by any of the usual methods: right click and use the context
> menu, or use Copy in the Edit menu, or use Ctrl-C.
> 4) Paste into any Mathematica Input cell expression, again using the usual
> methods.
> 
> For your second question, these are the timings I got for creating an array
> and then plotting it on a 800 Mhz PC. I designed the table so the Hue values
> would run from 0 to 1. It was necessary to include the decimal points in the
> iterators to avoid exact expressions and do machine precision calculations.
> Otherwise it takes much longer.
> 
> (mat = Table[(1 + Cos[x]*Sin[y])/2, {x, 0., Pi, Pi/600.}, {y, 0., Pi,
> Pi/600.}];)//Timing
> {0.83 Second, Null}
> 
> Timing[Show[Graphics[{Raster[mat, ColorFunction -> Hue]}],
>     AspectRatio -> Automatic, Frame -> True]; ]
> {3.51 Second, Null}
> 
> Is that too slow?
> 
> David Park
> djmp at earthlink.net
> http://home.earthlink.net/~djmp/
> 
> > From: Manuel Arala Chaves [mailto:machaves at fc.up.pt]
To: mathgroup at smc.vnet.net
> >
> > 	I have two questions:
...



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