| Re: interpolation between different files [message #82805] |
Wed, 16 January 2013 05:51 |
abc
Messages: 46
Registered: March 2011
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Member |
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On Wednesday, January 16, 2013 2:28:46 PM UTC+1, Helder wrote:
> On Wednesday, January 16, 2013 1:47:05 PM UTC+1, idlhelp wrote:
>
>> Hello All,
>
>>
>
>> I was trying to interpolate different model spectra w.r.t metallicity at a step of 0.1. In each model atmosphere I am having wave and flux w.r.t metallicity that ranges from -0.5 to +0.5 at a step of 0.5. The name of the files I am having is like that
>
>>
>
>>
>
>>
>
>> 2000K-0.5.txt
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>>
>
>> 2000K-0.0.txt
>
>>
>
>> 2000K+0.5.txt
>
>>
>
>> 2100K-0.0.txt
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>>
>
>> 2100K+0.5.txt
>
>>
>
>> .............
>
>>
>
>> .............
>
>>
>
>> 4000K-0.0.txt
>
>>
>
>>
>
>>
>
>> First I want to interpolate for 2000K files between -0.5 to +0.5 at a step of 0.1 and in order to do so I am interpolations first between 1st and 2nd file and then 2nd and 3rd file and so on. In order to do that I have wrote a code. It works fine when I just read the first two files separately but as I have 100's of such file I am reading all the file at once and then performing the following calculations. But I am not sure that the code always keep 2000K constant and doing the interpolation and then for 2100K .....and so on.
>
>>
>
>>
>
>>
>
>> Here is the code
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>>
>
>>
>
>>
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>> readcol,'list.txt',fna,format='A' ; reading list of files
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>>
>
>> nl = n_elements(fna)
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>>
>
>> nm = 268522 ; number of elements in one file
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>>
>
>> all_w = fltarr(nm,nl)
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>>
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>> all_f = fltarr(nm,nl)
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>>
>
>> for i=0,nl-1 do begin
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>>
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>> fname = fna(i)
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>>
>
>> readcol,fname,temp1,temp2
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>>
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>> all_w(*,i) = temp1
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>>
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>> all_f(*,i) = temp2
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>>
>
>> endfor
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>>
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>> alpha = (nl)-1
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>>
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>> alpha = long(alpha)
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>>
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>> for k = 0L, alpha do begin
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>>
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>> w1 = all_w(*,k)
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>>
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>> w2 = all_w(*,k+1)
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>>
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>> f1 = all_f(*,k)
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>>
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>> f2 = all_f(*,k+1)
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>>
>
>> linterp,w1,f1,w2,f1_2
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>>
>
>> frac = findgen(5*0.01)+0.5 ;Fractional distance between 0.0 and -0.5
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>>
>
>> for l = 0,4 do begin
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>>
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>> finterp = f1_2*frac(l)+f2*(1-frac(l));interpolated function
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>>
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>> endfor
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>> endfor
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>> end
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>> I am also getting an error "Attempt to subscript FRAC with L is out of range".
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>>
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>> Is there any how can I do that
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>>
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>>
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>>
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>> thanks in advance
>
>
>
> I didn't go through the whole code, but it seems that you are trying to make an array with the command
>
> frac = findgen(5*0.01)+0.5
>
> I don't see why you don't get an error before the one you mentioned... because that will give you an error.
>
> I think that what you should have wrote is:
>
> frac = findgen(5)*0.01+0.5
>
> Is this what you want:
>
> IDL> PRINT, findgen(5)*0.01+0.5
>
> 0.500000 0.510000 0.520000 0.530000 0.540000
>
> or do you want this:
>
> IDL> PRINT, -findgen(5)*0.1
>
> -0.000000 -0.100000 -0.200000 -0.300000 -0.400000
>
> or what should frac be?
>
>
>
> [for sure indexing a number that is not a number won't get you anywhere...]
>
>
>
> Cheers,
>
> Helder
Hi Helder,
sorry it was typing mistake.I have corrected it. But I don't know yet how I can I proceed with different files. :-(
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| Re: interpolation between different files [message #82806 is a reply to message #82805] |
Wed, 16 January 2013 05:28  |
Helder Marchetto
Messages: 520
Registered: November 2011
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Senior Member |
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On Wednesday, January 16, 2013 1:47:05 PM UTC+1, idlhelp wrote:
> Hello All,
>
> I was trying to interpolate different model spectra w.r.t metallicity at a step of 0.1. In each model atmosphere I am having wave and flux w.r.t metallicity that ranges from -0.5 to +0.5 at a step of 0.5. The name of the files I am having is like that
>
>
>
> 2000K-0.5.txt
>
> 2000K-0.0.txt
>
> 2000K+0.5.txt
>
> 2100K-0.0.txt
>
> 2100K+0.5.txt
>
> .............
>
> .............
>
> 4000K-0.0.txt
>
>
>
> First I want to interpolate for 2000K files between -0.5 to +0.5 at a step of 0.1 and in order to do so I am interpolations first between 1st and 2nd file and then 2nd and 3rd file and so on. In order to do that I have wrote a code. It works fine when I just read the first two files separately but as I have 100's of such file I am reading all the file at once and then performing the following calculations. But I am not sure that the code always keep 2000K constant and doing the interpolation and then for 2100K .....and so on.
>
>
>
> Here is the code
>
>
>
> readcol,'list.txt',fna,format='A' ; reading list of files
>
> nl = n_elements(fna)
>
> nm = 268522 ; number of elements in one file
>
> all_w = fltarr(nm,nl)
>
> all_f = fltarr(nm,nl)
>
> for i=0,nl-1 do begin
>
> fname = fna(i)
>
> readcol,fname,temp1,temp2
>
> all_w(*,i) = temp1
>
> all_f(*,i) = temp2
>
> endfor
>
> alpha = (nl)-1
>
> alpha = long(alpha)
>
> for k = 0L, alpha do begin
>
> w1 = all_w(*,k)
>
> w2 = all_w(*,k+1)
>
> f1 = all_f(*,k)
>
> f2 = all_f(*,k+1)
>
> linterp,w1,f1,w2,f1_2
>
> frac = findgen(5*0.01)+0.5 ;Fractional distance between 0.0 and -0.5
>
> for l = 0,4 do begin
>
> finterp = f1_2*frac(l)+f2*(1-frac(l));interpolated function
>
> endfor
>
> endfor
>
> end
>
>
>
>
>
> I am also getting an error "Attempt to subscript FRAC with L is out of range".
>
> Is there any how can I do that
>
>
>
> thanks in advance
I didn't go through the whole code, but it seems that you are trying to make an array with the command
frac = findgen(5*0.01)+0.5
I don't see why you don't get an error before the one you mentioned... because that will give you an error.
I think that what you should have wrote is:
frac = findgen(5)*0.01+0.5
Is this what you want:
IDL> PRINT, findgen(5)*0.01+0.5
0.500000 0.510000 0.520000 0.530000 0.540000
or do you want this:
IDL> PRINT, -findgen(5)*0.1
-0.000000 -0.100000 -0.200000 -0.300000 -0.400000
or what should frac be?
[for sure indexing a number that is not a number won't get you anywhere...]
Cheers,
Helder
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