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fitting a curve and adding values

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Matlabbey
Matlabbey 2012-8-21
hi all,
suppose i have the follo wing(i know it's linear but just for example of code)
x = [ 1 2 3 4 5];
i want to fit a spline through x and then use that to obtain twice as many values so that i would end up with 10 values in vector x. is that possible and how would that have impact on the data?
thank you!!

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2012-8-21
%you hav to specify x coordinate and y coordinate
x= [ 1 4 5 8 10]; y=sin(x) %for example
f=fit(x', y','smoothingspline')
%if
new_x=[1 2 3 4 5 6 7 8 9] %for example
new_y=f(new_x')
  2 个评论
Matlabbey
Matlabbey 2012-8-21
but what if i only have data values? would i just use 1,2,3,4 etc?
Azzi Abdelmalek
Azzi Abdelmalek 2012-8-21
ok if you have for example
y=rand(1,10) % data values
%then you must create x values
x=1:length(y)
f=fit(x', y','smoothingspline')
%then you can interpolate for
x1=[1 1.5 1.3 4.5 6.7];
y1=f(x1)

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