ex3_20.m

来自「源代码集合」· M 代码 · 共 34 行

tic
for i=1:5
   for j=1:10000
H(i,j)=1/(i+j-1);
   end
end
toc
     
tic, 
for j=1:10000
   for i=1:5
J(i,j)=1/(i+j-1);
   end
end
toc

tic
H=zeros(5,10000);
for i=1:5
   for j=1:10000
H(i,j)=1/(i+j-1);
   end
end
toc
     
tic
H=zeros(5,10000);
for i=1:5
   H(i,:)=1./[i:i+9999];
end
toc

tic, [i,j]=meshgrid(1:5,1:10000); H=1./(i+j-1); toc