li2.m

这是机械工业张德丰《MATLAB与外部程序接口编程》随书源码

function collect
y=zeros(1,100);  %Pre-allocate the matrix
for i=1:100
    y(i)=collect_one;
end

function y=collect_one
% #external
persistent t;
if(isempty(t))
    t=0;
end
t=t+0.05;
y=sin(t)