Question

Is there any built-in functions in MATLAB that would statistically extend a sequence of real numbers so that the resulting sequence is extended to any size I want. I have a sequence of 499 elements and I want to extend it to 4096 elements. Thanks in advance.

Answer 1

If you’re wanting to interpolate a vector of 499 elements to a higher resolution of 4096 elements, you can use the INTERP1 function in the following way (where x is your 499-element vector):

y = interp1(x,linspace(1,499,4096));

The above uses the function LINSPACE to generate a 4096-element vector of values spaced linearly between 1 and 499, which is then used as the interpolation points. By default, the INTERP1 function uses linear interpolation to compute new values between the old points. You can use other interpolation methods in the following way:

y = interp1(x,linspace(1,499,4096),'spline');  %# Cubic spline method
y = interp1(x,linspace(1,499,4096),'pchip');   %# Piecewise cubic Hermite method