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 Fix intercept in polynomial fit

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couturier Posted - 05/30/2020 : 3:19:36 PM
Origin Ver. and Service Release (Select Help-->About Origin): 2020b
Operating System:win10

Hi,
I'd like to fit with 2nd order polynom and fix intercept (i.e equation is y = a*x^2 + b*x).

I tried the example given with function ocmath_polynomial_fit

However when I try to fix intercept:
sLROptions.FixIntercept = true;
sLROptions.FixInterceptAt = 0;
the function won't work

How can I do that ?
Thanks
2   L A T E S T    R E P L I E S    (Newest First)
couturier Posted - 05/31/2020 : 5:57:11 PM
Thanks Castiel

Indeed, that line int nParam = (sLROptions.FixIntercept) ? nOrder : nOrder + 1; looked strange to me, but I didn't dare to change it
Castiel Posted - 05/31/2020 : 06:05:54 AM
quote:
Originally posted by couturier

Origin Ver. and Service Release (Select Help-->About Origin): 2020b
Operating System:win10

Hi,
I'd like to fit with 2nd order polynom and fix intercept (i.e equation is y = a*x^2 + b*x).

I tried the example given with function ocmath_polynomial_fit

However when I try to fix intercept:
sLROptions.FixIntercept = true;
sLROptions.FixInterceptAt = 0;
the function won't work

How can I do that ?
Thanks


That example is incorrect. Be the sLROptions.FixIntercept true or false, the size of psFitParameter must be at least (nOrder+1). To fix the problem:
//int nParam = (sLROptions.FixIntercept) ? nOrder : nOrder + 1;
int nParam = nOrder + 1;


You can also check the returned value from ocmath_polynomial_fit. nRet = -98 means STATS_PARAMS_ARRAY_TOO_SMALL.


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