| Re: Selecting data from two separate arrays [message #71501] |
Tue, 22 June 2010 03:20 |
Fster
Messages: 6
Registered: June 2010
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Junior Member |
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On 21 June, 21:33, Ed Hyer <ejh...@gmail.com> wrote:
> On Jun 21, 12:57 pm, Fster <francis.colle...@live.co.uk> wrote:
>
>> Would it be easier to combine them into one array? The issue is that
>> one array is on the x and y axis, and the other is on x, y, z axis,
>> BUT the x and y axis are the same for each of the arrays and equal
>> number of grid points...
>
> So, you want to select points from the XY array, and the extract the
> corresponding data from the XYZ array, right?
>
> There are quite a few ways to do this. Here's a simple one, not the
> fastest, but the simplest code-wise:
>
> DATA2 = <XY data>
> DATA3= <XYZ data>
> ;Get size of Z dimension
> NZ=(size(DATA3))[3]
> ; pick points from the XY data
> F2 = WHERE(DATA2 ge VALUE,NF2)
> ; set up an array to hold the extracted 3D data
> DATA3_EXTRACT = FLTARR(NF2,NZ)
> ; load the data into the array
> for IZ=0l,NZ-1 do DATA3_EXTRACT[*,IZ]=(DATA3[*,*,IZ])[F2]
In IDL is last section of the last line is it indexing or multiplying?
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| Re: Selecting data from two separate arrays [message #71504 is a reply to message #71501] |
Tue, 22 June 2010 02:21  |
Fster
Messages: 6
Registered: June 2010
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Junior Member |
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On 22 June, 00:35, Ed Hyer <ejh...@gmail.com> wrote:
> On Jun 21, 1:50 pm, Fster <francis.colle...@live.co.uk> wrote:
>
>> Thanks I see whats going on here, but at DATA3_EXTRACT line, it is
>> saying 'Array dimensions must be greater than 0.' and execution is
>> halted at this line.
>>> DATA3_EXTRACT = FLTARR(NF2,NZ)
>
> This means that either NF2 or NZ equals 0.
> PRINT,SIZE(DATA3) ; are the data actually 3-dimensional?
> HELP,F2 ; are there are data with DATA2 >= VALUE?
Thanks that was my error all is working brilliantly! much appreciated!
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| Re: Selecting data from two separate arrays [message #71509 is a reply to message #71504] |
Mon, 21 June 2010 16:35 |
MarioIncandenza
Messages: 231
Registered: February 2005
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Senior Member |
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On Jun 21, 1:50 pm, Fster <francis.colle...@live.co.uk> wrote:
> Thanks I see whats going on here, but at DATA3_EXTRACT line, it is
> saying 'Array dimensions must be greater than 0.' and execution is
> halted at this line.
>> DATA3_EXTRACT = FLTARR(NF2,NZ)
This means that either NF2 or NZ equals 0.
PRINT,SIZE(DATA3) ; are the data actually 3-dimensional?
HELP,F2 ; are there are data with DATA2 >= VALUE?
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| Re: Selecting data from two separate arrays [message #71511 is a reply to message #71509] |
Mon, 21 June 2010 13:50 |
Fster
Messages: 6
Registered: June 2010
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Junior Member |
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On 21 June, 21:33, Ed Hyer <ejh...@gmail.com> wrote:
> On Jun 21, 12:57 pm, Fster <francis.colle...@live.co.uk> wrote:
>
>> Would it be easier to combine them into one array? The issue is that
>> one array is on the x and y axis, and the other is on x, y, z axis,
>> BUT the x and y axis are the same for each of the arrays and equal
>> number of grid points...
>
> So, you want to select points from the XY array, and the extract the
> corresponding data from the XYZ array, right?
>
> There are quite a few ways to do this. Here's a simple one, not the
> fastest, but the simplest code-wise:
>
> DATA2 = <XY data>
> DATA3= <XYZ data>
> ;Get size of Z dimension
> NZ=(size(DATA3))[3]
> ; pick points from the XY data
> F2 = WHERE(DATA2 ge VALUE,NF2)
> ; set up an array to hold the extracted 3D data
> DATA3_EXTRACT = FLTARR(NF2,NZ)
> ; load the data into the array
> for IZ=0l,NZ-1 do DATA3_EXTRACT[*,IZ]=(DATA3[*,*,IZ])[F2]
Thanks I see whats going on here, but at DATA3_EXTRACT line, it is
saying 'Array dimensions must be greater than 0.' and execution is
halted at this line.
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| Re: Selecting data from two separate arrays [message #71512 is a reply to message #71511] |
Mon, 21 June 2010 13:33 |
MarioIncandenza
Messages: 231
Registered: February 2005
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Senior Member |
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On Jun 21, 12:57 pm, Fster <francis.colle...@live.co.uk> wrote:
> Would it be easier to combine them into one array? The issue is that
> one array is on the x and y axis, and the other is on x, y, z axis,
> BUT the x and y axis are the same for each of the arrays and equal
> number of grid points...
So, you want to select points from the XY array, and the extract the
corresponding data from the XYZ array, right?
There are quite a few ways to do this. Here's a simple one, not the
fastest, but the simplest code-wise:
DATA2 = <XY data>
DATA3= <XYZ data>
;Get size of Z dimension
NZ=(size(DATA3))[3]
; pick points from the XY data
F2 = WHERE(DATA2 ge VALUE,NF2)
; set up an array to hold the extracted 3D data
DATA3_EXTRACT = FLTARR(NF2,NZ)
; load the data into the array
for IZ=0l,NZ-1 do DATA3_EXTRACT[*,IZ]=(DATA3[*,*,IZ])[F2]
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