Problem related to legend

Hi everyone, I have made network architecture. I am having a problem with the legends as all of them are straight lines. The black square are buildings. The red-triangles are ABSs. Black stars are User outdoor. Blue circles are user indoor.

Thank you

[Star Strider]

We would need to see the code you used to create that plot to figure out what the problem might be.

[Aftab Ahmed Khan]

Hello, kindly look into the attachment.

Answer 1

[Robert Cumming]

When you create your plot save the handles of the plots that you want to add to the legend - then when you create your legend pass the handles to the legend function, see the example below:

 hold on;
 % create your first plot - give it a name and SAVE the handle to the plot
 hh(1) = plot ( [0 10 10 0 0], [0 0 10 10 0], 'k-', 'DisplayName', 'Buildings' );
 % plot other stuff - which will have no legend
 plot ( [0 10 10 0 0], [30 30 40 40 30], 'k-' )
 plot ( [30 40 40 30 30], [0 0 10 10 0], 'k-' )
 plot ( [30 40 40 30 30], [30 30 40 40 30], 'k-' )
 % next item you want to add to the legend save the handle
 hh(2) = plot ( [0:1:40], ones(41,1)+15, 'r-x', 'DisplayName', 'Other' );
 % create your legend!
 legend ( hh )

Answer 2

[Michael Haderlein]

Several possibilities:

- Make the buildings as one object. Put NaN values between the xy values of the buildings to separate them from each other.

- First plot users and the ABSs, then the buildings.

- Plot 4 dummys (just nan values) and give them the corresponding displaynames and markers/linestyles/colors. Then plot what is shown in your figure.

Answer 3

[Andrew Reibold]

I looked at your code and know exactly why your legend is doing this.

Early on in your code, you used this command four times before anything

plot(bx11,by11,'-k')

These are your four buildings, and you made them with black lines. When you use the legend command, it automatically generates the color and style in the same order that you plotted in . This means your first for legend entries you make will be these black lines.

There are different ways to solve this problem. I recommend saving handles of the plots you have. Robert has shown you how to do this, I'm just identifying what the problem was.

If possible, it might be easier just to plot your data first and the buildings and red triangles afterwards... this will give priority to your real data to be made in the legend first! :)

[Aftab Ahmed Khan]

Hello Andrew, thank you for the advice. I tried the Robert's way but it is giving me an assignment error. Have a look in the attachment.

[Robert Cumming]

handle is a matlab function (see which handle) - try another variable...

[Aftab Ahmed Khan]

Hi Robert, i did that but when i use the third plot command, as it contains multiple values. So it gives me an assignment error.

[Robert Cumming]

You could save your third plot handle as a temp var and use one of those to pass to the legend.

multipleHandles = plot ( ..... );

hh(N) = multipleHandles(1);

My solution shows you what you need to do - just update your code to fit that methodology.

[Aftab Ahmed Khan]

Hi, I am almost there using your approach. Now only the third line in the legend is faulty. I don't know why it is like this.

[Aftab Ahmed Khan]

Why it is showing me "getcolumn" thing in the third line ?

[Aftab Ahmed Khan]

Hi, thank you Robert. I done it.