# How do I plot lines with different line widths?

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Leor Greenberger 2011-9-22

Hi,
I want to do:
plot(x1,y1,x2,y2,'LineWidth',8)
but the linewidth propery ends up applying to both lines. Do I have to use two plot functions with a hold on command to have line1 a different width than line2? Thanks.
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Ramesh M 2016-7-28
it works thnx

### 采纳的回答

Fangjun Jiang 2011-9-22

To plot two lines with different line widths, you can use either of these approaches.
1. Return the two “Line” objects as an output argument from the “plot” function and then set the “LineWidth” property for each.
p = plot(x1,y1,x2,y2)
p(1).LineWidth = 5;
p(2).LineWidth = 10;
2. Use the “hold on” command to plot the two lines separately. Specify the line width by setting the “LineWidth” property a name-value pair.
plot(x1,y1,'LineWidth',5)
hold on
plot(x2,y2,'LineWidth',10)
hold off
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Mike Garrity 2016-3-8
Just FYI, there is an "official" syntax for setting a property to different values on different objects. However, it's really ugly, and doesn't work everywhere. For example, I don't think that the plot function accepts this form.
It looks like this:
h = plot(x1,y1,x2,y2);
set(h,{'LineWidth'},{5;10})
The property name and property value need to each be a cell array, and the shape of the value cell array has to match the shape of the handle cell array.
That said, you're really better off with 2 calls to set in this case.

### 更多回答（5 个）

Wayne King 2011-9-22
Hi: You can use handles.
h = plot(x1,y1,x2,y2);
set(h(1),'linewidth',1);
set(h(2),'linewidth',2);
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Hari Desanur 2016-11-15

The line width for a particular line can be set using line object handles. For example -
l = plot(x1,y1,x2,y2);
l(1).LineWidth = 3; % set line width of 3 for the first line (x1,y1)
l(2).LineWidth = 6;
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SHAILENDRA PANDEY 2020-10-11
x = 1:.01:10;
y1 = sin(x);
y2 = cos(x);
p = plot(x,y1,x,y2)
set(p,{'LineWidth'},{5;10})
Line width, specified as a positive value in points, where 1 point = 1/72 of an inch. If the line has markers, then the line width also affects the marker edges.
The line width cannot be thinner than the width of a pixel. If you set the line width to a value that is less than the width of a pixel on your system, the line displays as one pixel wide.
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Ananthakumar 2022-9-18
Plot v1 with a line width of 3.
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Jeri 2023-5-26，4:59
@ small world cup Thanks for your update. It's helpful for me.

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