Spline and PPL discrete points
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Dhruv Tripathi
am 21 Mär. 2020
Bearbeitet: Dhruv Tripathi
am 21 Mär. 2020
I am given data sets v and r to spline over an interval and graph. I have to use spline and ppl intervals to accomplish this however when I do this the spline is nothing like the data plot.
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David Goodmanson
am 21 Mär. 2020
Bearbeitet: David Goodmanson
am 21 Mär. 2020
Hi Dhruv.
your choice of a = 0.125 is kind of messing things up, because it's well above where the data ends. If you go only to the end of the data as in figure 2, the results are more sensible. Also,
spY = spline(v,r,XX);
is simpler than the two commands involving polyval.
a = .125;
sp = spline(v,r);
XX = linspace(0,a,100);
spY = ppval(sp, XX);
figure(1)
plot(v,r,'o',XX,spY);
grid on
a = max(v);
sp = spline(v,r);
XX = linspace(0,a,100);
spY = ppval(sp, XX);
figure(2)
plot(v,r,'o',XX,spY);
grid on
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