matlab画图设置字体_matlab画图代码大全

axis xy : 默认顺序，y轴的值从下往上递增
axis ij : 反向，y轴的值从上往下递增

box off  

set(gcf,'color','w');

plot(t,rel_err,'b*-');
lege = legend({'$N=2\times 10^7$'},'box','off','location','NorthWest','FontSize',14);
set(lege,'Interpreter','latex');
xlabel('t');
ylabel('relative error');