Mercurial > matrix-functions
view toolbox/vand.m @ 0:8f23314345f4 draft
Create local repository for matrix toolboxes. Step #0 done.
author | Antonio Pino Robles <data.script93@gmail.com> |
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date | Wed, 06 May 2015 14:56:53 +0200 |
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function V = vand(m, p) %VAND Vandermonde matrix. % V = VAND(P), where P is a vector, produces the (primal) % Vandermonde matrix based on the points P, i.e. V(i,j) = P(j)^(i-1). % VAND(M,P) is a rectangular version of VAND(P) with M rows. % Special case: If P is a scalar then P equally spaced points on [0,1] % are used. % Reference: % N.J. Higham, Stability analysis of algorithms for solving % confluent Vandermonde-like systems, SIAM J. Matrix Anal. Appl., % 11 (1990), pp. 23-41. if nargin == 1, p = m; end n = max(size(p)); % Handle scalar p. if n == 1 n = p; p = seqa(0,1,n); end if nargin == 1, m = n; end p = p(:).'; % Ensure p is a row vector. V = ones(m,n); for i=2:m V(i,:) = p.*V(i-1,:); end