35s Quadratic Regression Message #1 Posted by J Noël on 2 Feb 2011, 11:32 a.m.
I am new to HP programming and recently acquired a 35s. I was surprised to see it cannot do Quadratic Regression, so I wrote a basic program that will develop the twelve inputs necessary to use the built in 3*3 lin. solve equation.
Q001 LBL Q
Q002 CLVARS
Q003 CLSTK
Q004 SF 10
Q005 (eqn) QUADREG
Q006 (eqn) TOTAL SETS
Q007 PSE
Q008 INPUT N
Q009 STO N
Q010 1
Q011 STO M
Q012 (eqn) X
Q013 PSE
Q014 INPUT X
Q015 STO X
Q016 (eqn) Y
Q017 PSE
Q018 INPUT Y
Q019 STO Y
Q020 STO +D
Q021 RCL X
Q022 *
Q023 STO +H
Q024 RCL Y
Q025 RCL X
Q026 (X SQUARED)
Q027 *
Q028 STO +L
Q029 RCL X
Q030 STO +B
Q031 STO +E
Q032 (X SQUARED)
Q033 STO +C
Q034 STO +F
Q035 STO +I
Q036 RCL X
Q037 3
Q038 (Y to the X)
Q039 STO +G
Q040 STO +J
Q041 RCL X
Q042 4
Q043 (Y to the X)
Q044 STO +K
Q045 RCL M
Q046 STO +A
Q047 RCL N
Q048 RCL A
Q049 X<Y
Q050 GTO Q012
Q051 RTN
When it is finished, there will be values stored in memory locations A through L. Launch and Solve the 3*3 lin. solve builtin EQN and R/S your way through the alreadysaved values. It will return the X, Y, and Z results of the Quadratically Regressed X,Y inputs from the program.
If anyone knows a better way to do this, please share!
JN
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