More Built-in Fitting Functions

(ORG-3202, ORG-4463, ORG-5379)

Origin9.1 provides more built-in fitting functions:

1. Piecewise category
   PWL2
   
   

   
   PWL3
   
   

2. Rational category
   Rational5
   
   

3. Waveform category
   SawtoothWave
   
   

   
   SquareWave
   
   

   
   Step (Also in Baseline category)