Approximate a log curve as linear to predict a value
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Hello there,
I have the following code:
clf
P = [0.01; 0.1; 1; 3; 5; 10; 25; 50; 75; 90; 95; 97; 99; 99.9];
phi_1 = [5.28; 4.10; 2.82; 2.15; 1.82; 1.33; 0.59; -0.12; -0.72; -1.18; -1.42; -1.57; -1.81; -2.14];
Cs_1 = Cv_Q
K_p_1 = Cv_Q.*phi_1 + ones(length(phi_1),1);
Q_p_1 = meanQ*K_p_1;
semilogx(P, Q_p_1)
Which produces this curve
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/305231/image.png)
My plan is to approximate a line from P = 0.01 and P = 0.1 and then plot this line to predict the Q_p value at P = 0.01.
What is the best way to go about this?
Thanks,
Brian
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