| How to manipulate vectors by the index [message #93916] |
Wed, 23 November 2016 13:35  |
Edson Filho
Messages: 4
Registered: November 2016
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Junior Member |
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Hey guys, I'm a beginner here in Idl and at the moment, I have to create a program and I'm trying to organize the vectors by the index. I mean, the way I was doing it before, I was overlapping the values, so I want to change it. Here is the problem:
The program is about astrophysics and I got describe the behavior of some stars using monte carlo simulation. Here is the way I Declare my vector. The first collumn reffers to time, and the other one is the number of stars.
VarM2=fltarr((nt+nt2),E02)
VarM3=fltarr((nt+nt2),E03)
VarM4=fltarr((nt+nt2),E04)
VarM5=fltarr((nt+nt2),E05)
VarM8=fltarr((nt+nt2),E08)
VarM10=fltarr((nt+nt2),E10)
But now I want them to look like following a sequence, instead going from 0 to E02 ( A number of stars), goes form 0 to X (All number of stars) so I tried this :
For B=0,((nt+nt2)-1)do begin
For I=0,E02-1 do VarM2[B,I]=[B,0]
For I=E02,(E02+E03-1)do VarM3[B,I]=[B,0]
For I=E02+E03,(E02+E03+E04-1) do VarM4[B,I]=[B,0]
For I=E02+E03+E04,(E02+E03+E04+E05-1)do VarM5[B,I]=[B,0]
For I=E02+E03+E04+E05,(E02+E03+E04+E05+E08-1) do VarM8[B,I]=[B,0]
For I=E02+E03+E04+E05+E08,(E02+E03+E04+E05+E08+E10-1) do VarM10[B,I]=[B,0]
Endfor
The idea here is like:
Let's say E02 is 5, and E03 is 10, then VarM2 goes from 0 to 5, then VarM3 goes from 5 to 10
And then I got the error:
Attempt to subscript VARM3 with I is out of range.
Then I tried another way, kind of resuming everything in one vector
I declare this vetor with the size NP (Np here means the total number of stars) and (nt+nt2) reffers to time, just like above
VarM=fltarr((nt+nt2),Np)
VarM=[VarM2,VarM3,VarM4,VarM5,VarM8,VarM10]
Then Idl says :
Unable to concatenate variables because the dimensions do not agree: VARM3.
Does anyone know how to solve this? I would be glad if someone could help me!
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| Re: How to manipulate vectors by the index [message #93919 is a reply to message #93916] |
Wed, 23 November 2016 23:51  |
Helder Marchetto
Messages: 520
Registered: November 2011
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Senior Member |
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On Wednesday, November 23, 2016 at 10:35:30 PM UTC+1, Edson Filho wrote:
> Hey guys, I'm a beginner here in Idl and at the moment, I have to create a program and I'm trying to organize the vectors by the index. I mean, the way I was doing it before, I was overlapping the values, so I want to change it. Here is the problem:
>
> The program is about astrophysics and I got describe the behavior of some stars using monte carlo simulation. Here is the way I Declare my vector. The first collumn reffers to time, and the other one is the number of stars.
>
> VarM2=fltarr((nt+nt2),E02)
> VarM3=fltarr((nt+nt2),E03)
> VarM4=fltarr((nt+nt2),E04)
> VarM5=fltarr((nt+nt2),E05)
> VarM8=fltarr((nt+nt2),E08)
> VarM10=fltarr((nt+nt2),E10)
>
> But now I want them to look like following a sequence, instead going from 0 to E02 ( A number of stars), goes form 0 to X (All number of stars) so I tried this :
>
> For B=0,((nt+nt2)-1)do begin
> For I=0,E02-1 do VarM2[B,I]=[B,0]
> For I=E02,(E02+E03-1)do VarM3[B,I]=[B,0]
> For I=E02+E03,(E02+E03+E04-1) do VarM4[B,I]=[B,0]
> For I=E02+E03+E04,(E02+E03+E04+E05-1)do VarM5[B,I]=[B,0]
> For I=E02+E03+E04+E05,(E02+E03+E04+E05+E08-1) do VarM8[B,I]=[B,0]
> For I=E02+E03+E04+E05+E08,(E02+E03+E04+E05+E08+E10-1) do VarM10[B,I]=[B,0]
> Endfor
>
> The idea here is like:
> Let's say E02 is 5, and E03 is 10, then VarM2 goes from 0 to 5, then VarM3 goes from 5 to 10
>
>
> And then I got the error:
>
> Attempt to subscript VARM3 with I is out of range.
>
> Then I tried another way, kind of resuming everything in one vector
>
> I declare this vetor with the size NP (Np here means the total number of stars) and (nt+nt2) reffers to time, just like above
> VarM=fltarr((nt+nt2),Np)
> VarM=[VarM2,VarM3,VarM4,VarM5,VarM8,VarM10]
>
> Then Idl says :
> Unable to concatenate variables because the dimensions do not agree: VARM3.
>
>
> Does anyone know how to solve this? I would be glad if someone could help me!
Hi,
I think your second solution was pretty close:
> VarM=fltarr((nt+nt2),Np)
> VarM=[VarM2,VarM3,VarM4,VarM5,VarM8,VarM10]
Try this instead:
; this you can skip -> VarM=fltarr((nt+nt2),Np)
VarM=[[VarM2],[VarM3],[VarM4],[VarM5],[VarM8],[VarM10]]
It works for me:
IDL> nt = 2
IDL> nt2 = 3
IDL> e02 = 4
IDL> e03 = 5
IDL> e04 = 6
IDL> totalStars = e02+e03+e04
IDL> VarM2=fltarr((nt+nt2),E02)
IDL> VarM3=fltarr((nt+nt2),E03)
IDL> VarM4=fltarr((nt+nt2),E04)
IDL> print, 'total stars ', totalStars
IDL> print, 'total time ', nt+nt2
IDL> varM = [[VarM2],[VarM3],[VarM4]]
IDL> help, varM
total stars 15
total time 5
VARM FLOAT = Array[5, 15]
cheers,
Helder
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