Linear Interpolation: Given a pair of (x1,y1), (x2,y2) and x3 predict (x3,y3)

02142014, 04:44 PM
(This post was last modified: 02142014 04:45 PM by Rich.)
Post: #3




RE: Linear Interpolation: Given a pair of (x1,y1), (x2,y2) and x3 predict (x3,y3)
I just recently took Thermodynamics and fluid flow 1. For linear interpolations, i assigned this object which is pretty fast for me:
f(x_1,y_1,x_2,x_3,y_3):=y_2 = (((x_2x_1)*(y_3y_1))/(x_3x_1)) + y_1 x_1 = (Value) y_1 = (Value) x_2 = (Value) y_2 = Unknown x_3 = (Value) y_3 = (Value) To use just perform f(1,1,2.5,10,10) and ENTER The result should be a direct linear interpolation with y_2 = 2.5 I hope this helps. Though I recommend just using the EES software package, if it is available at your school and you can use it on an exam. It comes preloaded with almost all tabulated values of entropy, enthalpy, specific heat...etc etc. 

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