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T O P I C R E V I E W
wz1416scripps	Posted - 07/16/2015 : 5:55:08 PM Origin Ver. and Service Release (Select Help-->About Origin): originpro 2015 Operating System:Win 7 Hi, I am now defining a model for Originpro to fit my data. The model is y=a((3/2)(x/b)-(1/2)((x/b)^3)), if 0<x<=b y=Max value, if x>b I have already inputted the model y=a((3/2)(x/b)-(1/2)((x/b)^3))(this is spherical model). However, I don't know how to add the additional constrain, such as if 0<x<=b, and y does not change (maintained as the max value) if x>b. Can you help me? Thanks, Chao.
2 L A T E S T R E P L I E S (Newest First)
wz1416scripps	Posted - 07/17/2015 : 01:15:32 AM Thanks. It works! quote: Originally posted by jasonzhao Hello, Please refer to this tutorial, which introduce the fitting of Piecewise function; http://www.originlab.com/doc/Tutorials/Fitting-Piecewise-Linear You could try the function body like this: if( x < b ) y = a((3/2)(x/b)-(1/2)*((x/b)^3)); else y=a; Best regards! Jason OriginLab Technical Service
jasonzhao	Posted - 07/16/2015 : 11:01:48 PM Hello, Please refer to this tutorial, which introduce the fitting of Piecewise function; http://www.originlab.com/doc/Tutorials/Fitting-Piecewise-Linear You could try the function body like this: if( x < b ) y = a((3/2)(x/b)-(1/2)*((x/b)^3)); else y=a; Best regards! Jason OriginLab Technical Service

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