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How can i generate a function using this points?

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Mr. 206
Mr. 206 2018-8-29
评论： Cesar Antonio Lopez Segura 2018-8-30
If i got x=[1,3,8,25,45,23]; and y=[25,24,13,69,25,75];
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Adam
Adam 2018-8-29
There are an infinite number of functions that could take that one example input and give that output.
Mr. 206
Mr. 206 2018-8-29
Okey for example if i want a polynomial function, can you help me?

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采纳的回答

Jan
Jan 2018-8-29
x = [1,3,8,25,45,23];
y = [25,24,13,69,25,75];
p = polyfit(x, y, 5)

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Cesar Antonio Lopez Segura
Hi Here the solution:
% Your cloud point
x=[1,3,8,25,45,23];
y=[25,24,13,69,25,75];
% calculate a new cloud point that contain the last one
xnew = [1, 1.5 ,3,6,8,25,32,45,31,23];
ynew = interp1( x,y, xnew,'pchip' );
% plot de new values
plot(x,y,'o');hold on;plot( xnew, ynew,'r' )
% polinomios
p = interp1( x,y,'pchip' );
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Mr. 206
Mr. 206 2018-8-30
If the x values are not monotonic, then is there any way to handle this?
Cesar Antonio Lopez Segura
Cesar Antonio Lopez Segura 2018-8-30
You can define x values in ascending order with sort.
Then you can order de y values.
[xtointerpol indx ] = sort(x);
ytointerpol = y(indx);

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