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Re: PLOT3D format input [message #90626 is a reply to message #90621]

Wed, 18 March 2015 12:38

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

Hello,

On 03/17/15 22:49, Matthew Argall wrote:
>> t=FINDGEN(5,200)
>> x = t(1,*)
>> y = t(2,*)
>> z = t(3,*)
>>
>> p = PLOT3D(x, y, z,'o')
>
>
> I have found that function graphics are particularly picky about
> whether you pass them a column vector or row vector. Problems arise when
> you pass data in as a row vector (a 1xN array, as you are doing above).
> The solution is to reform your data into a column vector (Nx1 array),
> like so
>
> x = reform(t[1,*])
> y = reform(t[2,*])
> z = reform(t[3,*])
>
> p = plot3d(x, y, z, 'o')

Matthew's suggestion is a good one, but being the memory-layout-worrier
that I am (preferring t[*,0] over t[0,*]), I would simply transpose the
"t" array directly after reading it in from wherever it was created,

The original data...

IDL> t = findgen(5,200)
IDL> help, t
T FLOAT = Array[5, 200]
IDL> print, t[0,*]
0.00000
5.00000
10.0000
15.0000
20.0000
25.0000
30.0000
35.0000
40.0000
45.0000
.....

Transpose it for all subsequent use:

IDL> t = transpose(t)
IDL> help, t
T FLOAT = Array[200, 5]
IDL> print, t[*,0]
0.00000 5.00000 10.0000 15.0000 20.0000
25.0000 30.0000 35.0000 40.0000 45.0000
....

When the trailing dimension is the degenerate one, IDL happily ignores
it....

IDL> x = COS(t) * (1 + t / 10)
IDL> help, x
X FLOAT = Array[200, 5]
IDL> p = PLOT3D(x[*,0], x[*,1], x[*,2],'o')

cheers,

paulv

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[Message index]

		PLOT3D format input By: lucesmm on Tue, 17 March 2015 18:04
		Re: PLOT3D format input By: Matthew Argall on Tue, 17 March 2015 19:49
		Re: PLOT3D format input By: David Fanning on Tue, 17 March 2015 20:17
		Re: PLOT3D format input By: Matthew Argall on Wed, 18 March 2015 06:11
		Re: PLOT3D format input By: Paul Van Delst[1] on Wed, 18 March 2015 12:38
		Re: PLOT3D format input By: lucesmm on Thu, 19 March 2015 16:24

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