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Re: re-binning with linear interpolation [message #76368 is a reply to message #76367]

Wed, 01 June 2011 06:35

abc
Messages: 46
Registered: March 2011

Member

On Jun 1, 11:55 am, Wox <s...@nomail.com> wrote:
> On Wed, 1 Jun 2011 01:17:10 -0700 (PDT), abc <deearvin...@gmail.com>
> wrote:
>
>> I want to re-bin the wavelength at a step of 1 A and also the flux at
>> the same step but with linear interpolation.
>
> a=[[5201.720215,0.0097],$
> [5205.345215,0.0088],$
> [5208.970703,0.0080],$
> [5212.596191,0.0094],$
> [5216.221680,0.0133],$
> [5219.846680,0.0167],$
> [5223.472168,0.0169],$
> [5227.097656,0.0156],$
> [5230.722656,0.0145],$
> [5234.348145,0.0138],$
> [5237.973633,0.0130],$
> [5241.599121,0.0118],$
> [5245.224121,0.0110],$
> [5248.849609,0.0116],$
> [5252.475098,0.0134],$
> [5256.100586,0.0147],$
> [5259.725586,0.0139],$
> [5263.351074,0.0126]]
>
> ; New wavelengths
> b=floor(a[0,0])
> e=ceil(a[0,-1])
> inc=1.
> x=b+inc*lindgen(1,(e-b)/inc+1)
>
> ; Linear interpolate flux
> y=interpol(a[1,*],a[0,*],x)
>
> ; Plot
> pa=plot(a,'+r-')
> pb=plot(x,y,'+-',/overplot)

Dear Wox,
Thanks a lot for your help. I tried to run the program as
u mention and it works fine. But the problem is that as you took
e=ceil(a[0,1]) it stops at 5206A. and it is not proceeding further. I
have total 30000 data point. and I want to run the code for all of
them.
I tried with
b=floor(a[0,*])
e=ceil(a[0,*])
but then I am getting an error
"LINDGEN: Expression must be a scalar or 1 element array in this
context: <LONG Array[1, 18]".

hope you understand the my problem.

Again thanks for the prompt response.

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[Message index]

		Re: re-binning with linear interpolation By: Jeremy Bailin on Wed, 01 June 2011 12:01
		Re: re-binning with linear interpolation By: penteado on Wed, 01 June 2011 09:58
		Re: re-binning with linear interpolation By: abc on Wed, 01 June 2011 07:42
		Re: re-binning with linear interpolation By: David Fanning on Wed, 01 June 2011 07:02
		Re: re-binning with linear interpolation By: abc on Wed, 01 June 2011 06:35
		Re: re-binning with linear interpolation By: Wout De Nolf on Wed, 01 June 2011 02:55

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