How can I add random noise using the rand function with the noise being uniformly distributed between 0 and 2?

2014 1 27
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更新时间：2014 1 28
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If I have a new vector z=a1x^2 - a2y^2 + a3xy, how can I add random noise to all the elements in z using the function rand()? The noise needs to be uniformly distributed between 0 and 2.

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Amit
Amit 2014-1-27

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z=a1*x.^2 - a2*y.^2 + a3*x.*y + 2*rand(size(x));

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Adrian
Adrian 2014-1-27
Thank you so much. If I had already defined the vector before as z=a1*x.^2 - a2*y.^2 + a3*x.*y Can I just write: z = z + 2*rand(size(x)); ?
Adrian
Adrian 2014-1-28
Thank you. I just had one more question. If I need to use the nlinfit() function to find the coefficients 1,2,3 so that so that the surface of z is the best fit to the noisy data, do you know how I could do that?

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2014-1-27

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