Spline fitting with repeated X's
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so here is my matlab code, and the problem is there is repeated x values and spline fit code doesn't work how can i make it so it only takes the first x and doesn't take the repeated ones? And im not good at matlab so, can you please show how to add the code or add it to the original code.
load Pvst1.txt
load Fvst1.txt
tx = Pvst1(:,1);
tF = Fvst1(:,1);
x = Pvst1(:,2);
F = Fvst1(:,2);
tq=0:0.01:5.81;
Fq = interp1(tF,F,tq,'spline');
xq = interp1(tx,x,tq,'spline');
plot(xq,Fq,'ko');
hold on
xlabel('Position (m)','Fontsize',24)
ylabel('Force (N)','Fontsize',24)
title('Force vs. Position for car, Part A','Fontsize',24)
grid on
hold on
采纳的回答
tx and tF must be monotonically increasing without repeating values, but this is the case for your data. The x and F arrays do not matter. So everything should be o.k. for spline interpolation.
Do you get an error message ?
Replacing
tq=0:0.01:5.81;
by
tq=max(tx(1),tF(1)):0.01:min(tx(end),tF(end));
might help.
Best wishes
Torsten.
6 个评论
Olca Orakci
2015-12-9
Torsten
2015-12-9
The spline fit is done when you calculate xq and Fq.
You shouldn't request a spline for the plotting of Fq vs. xq.
Best wishes
Torsten.
Olca Orakci
2015-12-9
Torsten
2015-12-9
If you choose
plot(xq,Fq,'-ok')
the points are automatically connected by a solid line :-)
Best wishes
Torsten.
Olca Orakci
2015-12-9
dror yemini
2019-7-23
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