Mercurial > matrix-functions
view toolbox/seqcheb.m @ 3:d24a00dabdc2 draft
Added first test and Makefile after figuring out how to!!! Also removed
fontconfig rubbish created by a bug in my GNU/linux system.
Note: review E.B. Davies's paper "Approximate Diagonalization" for tricky
diagonalization problems.
author | Antonio Pino Robles <data.script93@gmail.com> |
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date | Fri, 15 May 2015 20:24:25 +0200 |
parents | 8f23314345f4 |
children |
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function x = seqcheb(n, k) %SEQCHEB Sequence of points related to Chebyshev polynomials. % X = SEQCHEB(N, K) produces a row vector of length N. % There are two choices: % K = 1: zeros of T_N, (the default) % K = 2: extrema of T_{N-1}, % where T_k is the Chebsyhev polynomial of degree k. if nargin == 1, k = 1; end if k == 1 % Zeros of T_n i = 1:n; j = .5*ones(1,n); x = cos( (i-j) * (pi/n) ); elseif k == 2 % Extrema of T_(n-1) i = 0:n-1; x = cos( i * (pi/(n-1)) ); end