Fit Cover Set 55
Fit Cover Set 55
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A Matlab question!! URGENT!!?
ok, heres the question, please tell me how can I work it out and what command should i put it. Many thanks!!!
The polynomial of degree n of “best” fit to the set of data points (Xi, Yi)
i = 1 , 2 … , m, can be found in Matlab using the polyfit command in the form:
P = polyfit(X,Y,n)
where P will hold the coefficients of the polynomial
anXn + an-1Xn-1 + an-2Xn-2 + … + a1X + a0
in the order [an , an-1, an-2, … , a1 , a0]
Find the quadratic of best fit to the data set given below:
X,1,2,3,4,5
Y,4,10.72,17.42,37,55.7
Plot the given data set and the fitted quadratic on the same set of axes, covering the range 0 ≤ X ≤ 6 .
ps. the anxn = a(small "n" below a) X to the power of n
the rest of the line is in a similar form. thank you again
X=[1,2,3,4,5];
Y=[4,10.72,17.42,37,55.7];
p=polyfit(X,Y,2);
xPlot=0:.1:6;
yPlot=polyval(p,xPlot);
plot(X,Y,'o',xPlot,yPlot)
axis([ 0 6 -inf inf])
legend('Data','Second order fit')