How to draw a nicer graph

Question

Yuechuan Chen 2019-10-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/485460-how-to-draw-a-nicer-graph

评论： Yuechuan Chen 2019-10-15

x=-2*pi:pi/100:2*pi;
y=sin(3*x);
z=cos(3*x);
plot(x,y,'k',x,z,'b')
plot(x,y,'--',x,z,'-')

Hi,

I've plotted the graph of cos(3x)=sin(3x) (left), but it looks rather messey, there's excess space on the left of the graph and also it's a bit too tall. Is there a way to make to so that it has some resemblance of the graph of the right? i.e. touching the y axis and more round-looking.

Thank You!!

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darova 2019-10-15

manipulate with axis command

Yuechuan Chen 2019-10-15

Thanks

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Answer 1

Steven Lord 2019-10-15

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/485460-how-to-draw-a-nicer-graph#answer_396458

Use the xlim function to change the limits of your X axis.

Also FYI you don't need to call plot twice. You can specify both a color and a line style (and a marker too, if you wanted) in one call. This can be particularly useful if you are plotting a lot of data, as it reduces the number of lines you create which means you need fewer copies of the data stored in those lines' properties.

% Make data
x=-2*pi:pi/100:2*pi;
y=sin(3*x);
z=cos(3*x);
% Plot with color and line style in the linespec for each line
plot(x,y,'k--',x,z,'b-')
% Change axes limits
xlim([-2*pi, 2*pi])