MATLAB基础绘图技巧入门

一.基本命令：

plot(); 绘图命令

hold on,hold off 清除之前的图形

legend();多图标注

xlabel();

ylabel();

zlable();

title();

text();文本

annotation();用于在图上绘制符号

关于图像字体和轴的设置命令

二.命令介绍

2.1

plot(); 绘图命令

%hold on,hold off 清除之前的图形%plot(x,y)%plot(y),x=1,2,3,4...hold on plot(cos(0:pi/20:2*pi));plot(sin(0:pi/20:2*pi));hold off

输出结果为

2.2 legend();多图标注

xlabel();

ylabel();

title();

%legend() 图标%xlabel%ylabel%title%zlable%hold on x=0:0.5:4*pi;y=sin(x);h=cos(x);w=1./(1+exp(-x));plot(x,y,'bd-',x,h,'gp:',x,w,'ro-');legend('sin(x)','cos(x)','sigmoid');xlabel('x');ylabel('y');title('function');%hold off

2.3text();文本

annotation();用于在图上绘制符号

%text();%annotation();x=linspace(0,3);y=x.^2.*sin(x);plot(x,y);line([2,2],[0,2^2*sin(2)]);str='$$ \int_{0}^{2} x^2\sin(x) dx $$';%'Interpreter','latex'只用latex的符号text(0.25,2.5,str,'Interpreter','latex');annotation('arrow','X',[0.32,0.5],'Y',[0.6,0.4]);

三. 图像字体和轴的设置命令

%%%gca、gcf是专门针对Figure和Axes的指令，如果针对Line，则需要定义h=plot（x，y）%get()用来获取特征；%set()用来设置特征；x=linspace(0,2*pi,1000);y=sin(x);plot(x,y);h=plot(x,y);get(h)

%set axes limits设置坐标的最大最小值x=linspace(0,2*pi,1000);y=sin(x);plot(x,y);set(gca,'XLim',[0,2*pi]);%xlim([0,2*pi]);set(gca,'YLim',[-1.5,1.5]);%ylim([-1.5,1.5]);

%setting font and tick of axes设置轴的字体和刻度x=linspace(0,2*pi,1000);y=sin(x);plot(x,y)set(gca,'FontSize',15);%轴的字体设置%set(gca,'XTick',0:pi/2:2*pi);%设置轴的刻度set(gca,'XTickLabel',0:90:360);%set(gca,'FontName','symbol');set(gca,'XTickLabel',{'0','\pi/2','\pi','3\pi/2','2p'});%%x=0:pi/100:2*pi;plot(x,sin(x));set(gca,'xtick',[ 0 0.5*pi pi 1.5*pi 2*pi]);xticklabels({'0','0.5\pi','\pi','1.5\pi','2\pi'})

%%%Multiple Figurex=-10:0.1:10;y1=x.^2-8;y2=exp(x);figure,plot(x,y1);figure,plot(x,y2);%figure position and size%figure('Position',[left,bottom,width,height]);figure('Position',[2,2,2,2]);%%%several plots in one figure ,subplot(m.n,t)x=-10:0.1:10;y1=x.^2-8;y2=exp(x);subplot(2,1,1);plot(x,y1);subplot(2,1,2);plot(x,y2);

四.参考ppt

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