?? dirstretch.m
字號:
%DIRSTRETCH variable directional stretching of a complex vectorfunction y=dirstretch(x,dir,coef)if nargin == 3 if ~isreal(dir) && all(abs(dir) ~= 1) warning('non unit modulus of direction argument ignored') end if isreal(dir) && any(abs(dir) ~= 1) dir = exp(i*dir); end if any(dir==0) error('invalid zero direction argument') end tmp = abs(dir); tmp(tmp==0) = 1; % to avoid NaNs dir = dir./tmp;endif nargin == 2 coef = abs(dir); tmp = coef; tmp(coef==0) = 1; % to avoid NaNs dir = 1./tmp.*dir;endrotx = x.*conj(dir);y = coef.*dir.*real(rotx)+i*dir.*imag(rotx);
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