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comparison scripts/signal/fftconv.m @ 904:3470f1e25a79

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[project @ 1994-11-09 21:22:15 by jwe]
author jwe
date Wed, 09 Nov 1994 21:22:15 +0000
parents c5d35bb139b6
children 9fc405c8c06c
comparison
equal deleted inserted replaced
903:b3692d63cca3 904:3470f1e25a79
1 function c = fftconv (a, b, N) 1 function c = fftconv (a, b, N)
2 2
3 # usage: fftconv (a, b [, N]) 3 # usage: fftconv (a, b [, N])
4 # 4 #
5 # c = fftconv (a, b) returns the convolution of the vectors a and b, 5 # c = fftconv (a, b) returns the convolution of the vectors a and b,
6 # a vector with length equal to length (a) + length (b) - 1. 6 # a vector with length equal to length (a) + length (b) - 1.
7 # If a and b are the coefficient vectors of two polynomials, c is 7 # If a and b are the coefficient vectors of two polynomials, c is
8 # the coefficient vector of the product polynomial. 8 # the coefficient vector of the product polynomial.
9 # 9 #
10 # The computation uses the FFT by calling fftfilt. If the optional 10 # The computation uses the FFT by calling fftfilt. If the optional
11 # argument N is specified, an N-point FFT is used. 11 # argument N is specified, an N-point FFT is used.
12 12
13 # Written by KH (Kurt.Hornik@ci.tuwien.ac.at) on Sep 3, 1994 13 # Written by KH (Kurt.Hornik@ci.tuwien.ac.at) on Sep 3, 1994
14 # Copyright Dept of Statistics and Probability Theory TU Wien 14 # Copyright Dept of Statistics and Probability Theory TU Wien
15 15
16 if (nargin < 2 || nargin > 3) 16 if (nargin < 2 || nargin > 3)
17 error ("usage: fftconv (b, x [, N])"); 17 usage (" fftconv (b, x [, N])");
18 endif 18 endif
19 19
20 if (is_matrix (a) || is_matrix (b)) 20 if (is_matrix (a) || is_matrix (b))
21 error ("fftconv: both a and b should be vectors"); 21 error ("fftconv: both a and b should be vectors");
22 endif 22 endif