39 lines
663 B
Matlab
39 lines
663 B
Matlab
clear, clc, close all
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#xf = [0:0.05:10];
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#Yf = sin (2*pi*xf/5);
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#xp = [0:10];
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#Yp = sin (2*pi*xp/5);
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#lin = interp1 (xp, Yp, xf);
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#near = interp1 (xp, Yp, xf, "nearest");
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#pch = interp1 (xp, Yp, xf, "pchip");
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#spl = interp1 (xp, Yp, xf, "spline");
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#plot (xf,Yf,"r", xf,near,"g", xf,lin,"b", xf,pch,"c", xf,spl,"m",
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# xp,Yp,"r*");
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#legend ("original", "nearest", "linear", "pchip", "spline");
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x = [0 4 8 12];
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y = [5 3 10 13];
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n = length(x);
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Y = log(y);
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coeff = [sum(x) n; sum(x.^2) sum(x)];
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free = [sum(Y); sum(x.*Y)];
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V = coeff\free # inv(coeff) * free
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A = V(1)
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#exp:
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a = exp(A)
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b = V(2)
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Sr = (sum(Y - a*x - b).^2)
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f = a*x + b;
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plot(x,y,'*',x,f)
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