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Re: [Help-gsl] what does xstride,ystride mean and how to set them?


From: Richard
Subject: Re: [Help-gsl] what does xstride,ystride mean and how to set them?
Date: Fri, 17 Sep 2010 13:53:30 +0800
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.9) Gecko/20100825 Thunderbird/3.1.3

 Hi Wang,
I understand now. Thanks very much!

Regards
Richard

On 2010/9/17 11:38, Hongzheng Wang wrote:
Hi,

these parameters are used to control the step lengths of data
samplings.  Consider data sequence x for example.  The data you would
like to feed into this function may not be one by one but every two.
Then you need to let xstride be 2 to achieve that.

Best,
HZ

On Thu, Sep 16, 2010 at 10:48 PM, Richard<address@hidden>  wrote:
  Hi,
I want to use  gsl_fit_linear function. But I am puzzled withe the
parameters xstride and ystride.
Could anybody like to give some explanations ?
Thanks in advance.

Richard
PS. function signature :
  int *gsl_fit_linear* (const double * x, const size_t xstride, const double
* y, const size_t ystride, size_t n, double * c0, double * c1, double *
cov00, double * cov01, double * cov11, double * sumsq)

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