Is any change 'DisplayName' property in plot function?

Question

Lef Lederer 2015-3-19

5
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/183984-is-any-change-displayname-property-in-plot-function

评论： Muhammad Sajid Haroon 2021-8-13

采纳的回答： Mike Garrity

在 MATLAB Online 中打开

plot(x,y,'DisplayName',{'name1','name2','name3','name4'})

produce error

Error using plot
Value must be a string.

This shall produce this plot with curve names.

Is any change in 'DisplayName' property in plot function?

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Baptiste Contour 2020-6-26

编辑：Baptiste Contour 2020-6-26

在 MATLAB Online 中打开

Using 2020a

Names need to be a char:

plot(magic(4),'DisplayName',char({'name1','name2','name3','name4'}))

You still need to specify a minimum the legend afterwards to display it, eg:

legend('location', 'best');

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Answer 1

Mike Garrity 2015-3-19

9
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/183984-is-any-change-displayname-property-in-plot-function#answer_171974

在 MATLAB Online 中打开

When we were rebuilding all of the graphics objects as MATLAB Objects, we found they they had several different variations of code that parsed this cell array case. You'll find in older versions of MATLAB that some variations of this will work for some objects, but not for others.

We wanted to unify this code so that all of the objects worked the same way. That way you wouldn't have to learn the differences between the different objects. But we couldn't come up with one version that replicated all of the existing variations. This particular case was one of the casualties.

The simplest workaround here is to use the set command, because it works the same for all objects. In this case, the following should work in any version of MATLAB.

h = plot(magic(3));
set(h,{'DisplayName'},{'first';'second';'third'})
legend show

If you look carefully at this, you'll notice some important points.

The property name is also in a cell array.
The cell array of values is the same shape as the array of handles.

This is the canonical form of this cell array 'dealing' syntax. It's the one that the various plotting commands were trying to match. But most of them were slightly different from this.

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Mike Garrity 2015-8-5

在 MATLAB Online 中打开

1) I guess I wasn't clear. I was saying that this:

h = plot(magic(3),{'DisplayName'},{'first';'second';'third'});

would not work. You need to use the set command.

2) I'm not clear on what you expected this to do:

h = plot(magic(3));
hold on
plot(h,magic(3));

The first call to plot is returning the handles of the three graphics objects. You've passed those into the second call to plot as the X coordinates. It didn't error because of a tricky bit of code which is in there for compatibility with old versions of MATLAB where handles were doubles. It found that it could cast the handles to doubles because of that, and it used those double handles as the X coordinates. But again, I can't imagine what you expected it to do.

3) In this last one:

h = plot(magic(3));
set(h,{'DisplayName'},{'first';'second';'third'})
legend show
hold on
plot(h,magic(3))
set(h,{'DisplayName'}, ...
  {'first';'second';'third';'first';'second';'third'})

You're getting an error which says:

Error using matlab.graphics.chart.primitive.Line/set
Value cell array handle dimension must match handle vector length.

That's because your array h has 3 elements, but you've given it 6 values for the DisplayName property. As it's saying, the "cell array handle dimension" must match the "handle vector length".

My guess is that what you're trying to do is something like this:

h = gobjects(1,6);
h(1:3) = plot(randn(3));
hold on
h(4:6) = plot(randn(3));
set(h,{'DisplayName'}, ...
      {'A';'B';'C';'D';'E';'F'})

Prajwal Gowdru Shanthamurthy 2021-4-13

Hey Mike,

How do I set the interpreter for the 'DisplayName' strings as latex ?

Thanks in advance!

Muhammad Sajid Haroon 2021-8-13

Hi, i think this will work for you..it work for me.

plot(gammadB,PcovM,':+b','DisplayName','coverage','linewidth',2,'markersize',9);

h1= legend('location', 'best');

set(h1,'Interpreter','latex');

set(h1,'FontSize',32);

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Is any change 'DisplayName' property in plot function?

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