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Re: how to draw three-dimension graph using IDL [message #43661 is a reply to message #43652]

Tue, 19 April 2005 08:54

Paolo Grigis
Messages: 171
Registered: December 2003

Senior Member

lixiaoyao wrote:
> thank you so much,you are so powerful.
> Paolo Grigis wrote:
>
>> for a surface, you could try:
>>
>> x=4*!pi*findgen(101)/100
>> y=4*!pi*findgen(101)/100
>>
>> xx=rebin(x,n_elements(x),n_elements(y))
>> yy=rebin(transpose(y),n_elements(x),n_elements(y))
>
> why does there need to transpose? I am a little bit confuse.
Well, of course you have to try to understand the code
for yourself, the best way to do it is to try out with
a simple example:

x=[1,2,3]
y=[1,2,3]

xx=rebin(x,n_elements(x),n_elements(y))
yy=rebin(transpose(y),n_elements(x),n_elements(y))

IDL> print,xx
1 2 3
1 2 3
1 2 3
IDL> print,yy
1 1 1
2 2 2
3 3 3
(you see why I had to transpose to get yy?)

IDL> z=xx+yy
IDL> print,z
2 3 4
3 4 5
4 5 6

Now z[i,j] is equal to x[i]+y[j], and the "rebin" call
was used to inflate the x and y array in order to avoid
the need of writing two nested for loops over i and j
to fill out the values of z[i,j]=x[i]+y[j].

Paolo

>
>> shade_surf,sin(xx)*sin(yy),xx,yy

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[Message index]

		Re: how to draw three-dimension graph using IDL By: Dick Jackson on Tue, 19 April 2005 23:14
		Re: how to draw three-dimension graph using IDL By: lixiaoyao on Tue, 19 April 2005 14:42
		Re: how to draw three-dimension graph using IDL By: Dick Jackson on Tue, 19 April 2005 12:23
		Re: how to draw three-dimension graph using IDL By: Paolo Grigis on Tue, 19 April 2005 08:54
		Re: how to draw three-dimension graph using IDL By: lixiaoyao on Tue, 19 April 2005 08:11
		Re: how to draw three-dimension graph using IDL By: Paolo Grigis on Tue, 19 April 2005 07:51

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