On Fri, Mar 2, 2012 at 3:41 AM, Aykut Caglayan aykut_caglayan@yahoo.com wrote:

What is the reason for not being able to get the accurate value of the first and last element of an array using tabread4?

The array used by tabread4~ expects to have 1 sample copied from the last element of the array to the beginning, and 2 samples from the beginning copied to the end of the array. You get this automatically when using the sinesum/cosinesum array creation methods for example. Others?

For a given fractional index x on [n, n+1) tabread4~ takes four points f[n-1], f[n], f[n+1], f[n+2].

So, if you start with an N length array, you want to have it be N+3 long to hold the extra points and index it between 1 and N.

Chuck