有啊,怎么没有,下面是MATLAB自带的conv函数（在命令窗口敲 edit conv 可打开）：
如果你真没有,那么把下面的复制一下就可以用了.
function c = conv(a,b,shape)
%CONV Convolution and polynomial multiplication.
% C = CONV(A,B) convolves vectors A and B.The resulting vector is
% length MAX([LENGTH(A)+LENGTH(B)-1,LENGTH(A),LENGTH(B)]).If A and B are
% vectors of polynomial coefficients,convolving them is equivalent to
% multiplying the two polynomials.
%
% C = CONV(A,B,SHAPE) returns a subsection of the convolution with size
% specified by SHAPE:
% 'full' - (default) returns the full convolution,
% 'same' - returns the central part of the convolution
% that is the same size as A.
% 'valid' - returns only those parts of the convolution
% that are computed without the zero-padded edges.
% LENGTH(C)is MAX(LENGTH(A)-MAX(0,LENGTH(B)-1),0).
%
% Class support for inputs A,B:
% float:double,single
%
% See also DECONV,CONV2,CONVN,FILTER and,
% in the Signal Processing Toolbox,XCORR,CONVMTX.
% Copyright 1984-2010 The MathWorks,Inc.
% $Revision:5.16.4.9 $ $Date:2010/10/25 16:06:08 $
if isvector(a) || isvector(b)
error(message('MATLAB:conv:AorBNotVector'));
end
if nargin < 3
shape = 'full';
end
if ischar(shape)
error(message('MATLAB:conv:unknownShapeParameter'));
end
% compute as if both inputs are column vectors
c = conv2(a(:),b(:),shape);
% restore orientation
if shape(1) == 'f'
if length(a) > length(b)
if size(a,1) == 1 %row vector
c = c.';
end
else
if size(b,1) == 1 %row vector
c = c.';
end
end
else
if size(a,1) == 1 %row vector
c = c.';
end
end
再问： 非常感谢啊，那我输入命令mhelp conv 后怎么说No exact matches found, please try one of the following: convergs convert 还有，自编的m文件名字是不是不能写成conv.m啊，，我很菜，见谅啊
