| T O P I C R E V I E W |
| Farqhuit |
Posted - 01/24/2023 : 10:42:47 AM
Origin Ver. and Service Release (Select Help-->About Origin): Pro 2021b SR2 9.8.5.212
Operating System:Win 10
I have x and y data. When I do a polynomial fit, I get a reasonable fit from 4th-order. However, when I use the formula from the fit as a formula in the worksheet (col C) I get a rather different fit from my y data.
I tried parenthisizing the formula but it makes no difference.
When I apply the formula with a calculator it consistently returns the same result, that is, it matches the formula in the worksheet but not the 4th-order fit.
Can someone tell me what's going wrong? Thanks
https://my.originlab.com/ftp/forum_and_kbase/Images/4th%20order%20fit.opju
Farqhuit |
| 3 L A T E S T R E P L I E S (Newest First) |
| snowli |
Posted - 01/24/2023 : 12:12:10 PM
Sorry that I forgot to to mention FAQ related to this
https://www.originlab.com/doc/en/Quick-Help/Display-Calculate-Precision
https://www.originlab.com/doc/Quick-Help/AnalysisResult-Precision
And how to access result values in such hierachical tables in Set Column Values.
https://www.originlab.com/doc/Quick-Help/refer-to-fitting-parameters-in-SCV
Thanks, Snow |
| Farqhuit |
Posted - 01/24/2023 : 11:31:53 AM
Thanks for that Snow, that's done the trick. The copy full precision is a handy trick, and I wasn't sure if the extra precision was available as it was not obvious how to access it.
Farqhuit |
| snowli |
Posted - 01/24/2023 : 11:07:25 AM
Hello,
This is because we don't show full precision in FitPolynomial1.
E.g. if u right click Parameters table node and choose Digits... and change Decimal places to 10. U can see more digits.
U can right click Parameters table and choose Create Copy as New Sheet.
Then in the newly added parameters1 sheet, right click the cell to copy full precision.
Thanks, Snow |
