generate vector from fixed point

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matteo avanzi 2017-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/370200-generate-vector-from-fixed-point

回答： Jos (10584) 2017-11-30

I have a 1x35 array, i want to generate a vector 1x31822 interpolating from the 35 points of the first vector, in a way that the two vectors could have the same shape.

which is the best method?

thanks

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Jos (10584) 2017-11-30

what do you mean by "have the same shape"? Can you give a small example?

matteo avanzi 2017-11-30

yes, the first array represent a kind of parabola with 35 points, i want to create a vector using this 35 points as keypoints; for example between the 1st and 2nd there must be around 909 points(31822/35) that interpolate the 1st and 2nd points. and so on for every point.

hope that it's better

thanks

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Answer 1

KSSV 2017-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/370200-generate-vector-from-fixed-point#answer_293951

在 MATLAB Online 中打开

Read about interp1.

th = linspace(0,2*pi,35) ;
y = sin(th) ;
figure
hold on
plot(th,y,'.r')
%%interpolation
thi = linspace(min(th),max(th),31822) ;
yi = interp1(th,y,thi) ;
plot(thi,yi,'b') ;

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Answer 2

Jos (10584) 2017-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/370200-generate-vector-from-fixed-point#answer_293955

在 MATLAB Online 中打开

interp1 is your friend. An example:

x = [0 4 7 10] 
y = (x-5).^2 
xx = linspace(0,10,13)
yy0 = interp1(x,y,xx) % default: linear interpolation 
yy1 = interp1(x,y,xx,'pchip') 
plot(xx,yy0,'r-',xx,yy1,'g-', x,y,'bo')