I have a sine function y = a*sin(bx-c)+d and I have 4 points on the function: P1(0.840,0.730) P2(1.516,0.594) P3(2.879,0.236) P4(3.365,0.652)?

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Julianna
Julianna 2014-11-25
评论： Julianna 2014-11-25
So I get the following equations:
0.730=a*sin(0.840b-c)+d
0.594=a*sin(1.516b-c)+d
0.236=a*sin(2.879b-c)+d
0.652=a*sin(3.365b-c)+d
Could someone please help me solve for the variables a,b,c,d? Thank you!

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Torsten
Torsten 2014-11-25
I get
a=-0.386091187
b=-2.36473575
c=-0.96663067
d=0.401059696
Of course, since sin(x)=sin(x+2*Pi), the constant c can be changed to c+2*Pi, c-2*Pi, c+4*Pi, c-4*pi etc.
Best wishes
Torsten.

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