matlab中使用正弦波合成方波（带动画）




x=0:0.1:6*pi; 

for step=1:2:100 
s=0; 
for i=1:2:step 
s = s+1/i*sin(i*x); 
end 
plot(s);set(figure(1),\'visible\',\'off\'); 
filename=[num2str(step, \'%04d\'),\'.png\']; 
print(1, \'-dpng\',filename); 

end