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Re: linear fit y=ax [message #46670 is a reply to message #46667]

Wed, 07 December 2005 08:48

Paolo Grigis
Messages: 171
Registered: December 2003

Senior Member

Paolo Grigis wrote:
>
>
> lajam@caramail.com wrote:
>
>> Hello,
>>
>> I have a very easy question but I didn't find the answer in the IDL
>> reference guide. I want to fit data with a linear fit y=ax. I want to
>> impose my fit to pass by zero. I have looked at the linfit, regress,
>> ... functions and I didn't understand how to adapt these functions for
>> my problem. I have tried with regress:
>> result=regress(desired_value,calculated_value,weigths) but I'm not sure
>> that it's the regular way to obtain calculated_value=A*desired_value.
>
>
> try: total(y)/total(x)
actually, I meant total(y*x)/total(x*x)
>
>
> Ciao,
> Paolo
>
>
>> Could someone help me, please?
>>
>>
>> Thanks,
>> Cedric
>>

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[Message index]

		Re: linear fit y=ax By: mmeron on Wed, 07 December 2005 09:47
		Re: linear fit y=ax By: Paolo Grigis on Wed, 07 December 2005 08:48
		Re: linear fit y=ax By: Paolo Grigis on Wed, 07 December 2005 08:32

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