ezplot.m

来自「这是一个基于matlab开发的关于c语言的图形转换程序,可实现直方图的生成和传输」· M 代码 · 共 68 行

function hOut = ezplot(sig,varargin)
%EZPLOT Overloaded EZPLOT command.
%   EZPLOT(sig) plots the expression f = f(x) over the default
%   domain supp(1) - 0.5*diff(supp) <= x <= supp(2) + 0.5*diff(supp)
%   where supp = SUPPORT(sig).
%
%   EZPLOT(sig,[a,b]) plots f = f(x) over a<= x <= b.
%
%   h = EZPLOT(...) returns the handle to the line object.
%
%   The arguments can be followed by parameter/value pairs which
%   get applied to the line object.
%
%   See also SUPPORT

% Jordan Rosenthal, 11/04/99
%             Rev., 26-Oct-2000 : Changed sig(t) to feval(sig,t) to make
%                               : function work inside class directory.

YES = 1; NO = 0;

supp = support(sig);
   
if nargin == 1
   a = supp(1) - 0.5*diff(supp);
   b = supp(2) + 0.5*diff(supp);
else
   if ~isa(varargin{1},'char')
      a = varargin{1}(1);
      b = varargin{1}(2);
      if length(varargin)>1
         varargin = varargin(2:end);
      else
         varargin = {};
      end
   else
   a = supp(1) - 0.5*diff(supp);
   b = supp(2) + 0.5*diff(supp);
   end
end

fs = suggestrate(sig,[a b]);
if (supp(1)>b) | (supp(2)<a)
   t = [a b];
   y = [0 0];
elseif (supp(1)<a) & (supp(2)>b)
   t = a:1/fs:b;
   y = feval(sig,t);
elseif supp(1)>a & supp(2)<b
   t = supp(1):1/fs:supp(2);
   y = feval(sig,t);
   t = [a t(1) t t(end) b];
   y = [0 0 y 0 0];
elseif supp(1)<a
   t = a:1/fs:supp(2);
   y = feval(sig,t);
   t = [t t(end) b];
   y = [y 0 0];
else
   t = supp(1):1/fs:b;
   y = feval(sig,t);
   t = [a t(1) t];
   y = [0 0 y];
end

h = plot(t,y,varargin{:});

if nargout > 0, hOut = h; end