为什么会出错啊，请教各位。

xmin=-2;

xmax=6;

ymin=-2;

ymax=4;

theta=linspace(0,2*pi,200);

x_circle=cos(theta);

y_circle=sin(theta);

theta_slanted_line_array=linspace(0,pi/4,100);

for i=1:length(theta_slanted_line_array)

theta_slanted_line=theta_slanted_line_array(i);

figure(1);clf;hold on;

plot(x_circle,y_circle,'k-','linewidth',2);

plot([xmin,xmax],[0,0],'b','linewidth',2);

plot([-1,xmax],[0,tan(theta_slanted_line)*(xmax+1)],'r','linewidth',2);

plot(2*cos(theta_slanted_line)^2-1,2*cos(theta_slanted_line)*sin(theta_slanted_line),'b','linewidth',2);

axis equal;

axis([xmin,xmax,ymin,ymax]);

grid on;box on;

drawnow;

print('-r200','-dpng',['figure/figure_1_' num2str(i,'fig%05d') '.png']);

end

Answer 1

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你print函数用错了，参考代码：

xmin=-2;
xmax=6;
ymin=-2;
ymax=4;
theta=linspace(0,2*pi,200);
x_circle=cos(theta);
y_circle=sin(theta);
theta_slanted_line_array=linspace(0,pi/4,100);
for i=1:length(theta_slanted_line_array)
   theta_slanted_line=theta_slanted_line_array(i);
   figure(1);clf;hold on;
   plot(x_circle,y_circle,'k-','linewidth',2);
   plot([xmin,xmax],[0,0],'b','linewidth',2);
   plot([-1,xmax],[0,tan(theta_slanted_line)*(xmax+1)],'r','linewidth',2);
    plot(2*cos(theta_slanted_line)^2-1,2*cos(theta_slanted_line)*sin(theta_slanted_line),'b','linewidth',2);
    axis equal;
    axis([xmin,xmax,ymin,ymax]);
    grid on;box on;
    drawnow;
    print(['F:\Matlabwork\figure\',num2str(i,'fig%05d')],'-dpng');
end