Matlab, how to create non linear curve from random data?

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uncung fgv 2012-4-22

example i have data

x=linspace(4,6,7) %data x from 4 until 6 with 7 elements

y=linspace(8,17,7)

i will create hiperbolik data or non linear randomly in matlab

Walter Roberson 2012-4-22

curvedegree = 2;  %set as desired
coeffs = polyfit(x, y, curvedegree);
plot(x, polyval(coeffs, x));  %plot fitted y

uncung fgv 2012-4-23

why the plot still liniear?

my data:

>> x=linspace(6.502,6.9,5)

>> y=linspace(63.5,75.39,5)

still linear?

Jan 2012-4-23

Because you fit a parabola to a line.

Where are the random data you are talking of in the subject line?

What about: y = rand(size(x))?

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