All Forums  Origin Forum for Programming  LabTalk Forum  Get coefficients in polynom fitting

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by JokerOne[/i] [br]Origin Ver. 9 and Service Release 1(Select Help-->About Origin): Operating System: Win 7 I am trying to fit some data using polynoms with varying order. In the documentation I found two option in doing so using LabTalk: 1.) polyfit X-function: http://www.originlab.com/doc/LabTalk/guide/Linear-Fitting#Polynomial_Regression This was perfect, if not the fact, that I like to investigate the sum of the squared residuals. If am am correctly, this value is not provided in the output of polyfit. However, the polynom coeffients are sorted nicely in a dataset. 2.) Using xop and the FitPolynomial class as described here: http://www.originlab.com/doc/LabTalk/examples/Curve-Fitting#Polynomial_Fit This looks very nice, as one has access to basically every result value you can think of, BUT, here, the coefficients are sorted seperately in the result tree structure. As also given in the example one has to "pick" every coefficient, like: // Get the coefficients from the output tree coef1[1] = polyOut.Parameters.Intercept.Value; coef1[2] = polyOut.Parameters.B1.Value; coef1[3] = polyOut.Parameters.B2.Value; coef1[4] = polyOut.Parameters.B3.Value; I would prefer to use option 2, however, when I want to use varying polynom orders, I guess, that I somehow have to cope with this mentioned issue. Is there an easy way, like a magical function: GetCoeff(result_tree) ? Otherwise, I guess I will have to write a huge Switch-structure, switching through all possible orders or so...? Thanks for your help [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.