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How to remove labels from a plot?

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Pedro Guevara
Pedro Guevara 2019 年 8 月 8 日
コメント済み: Adam Danz 2019 年 8 月 10 日
Goodnight. I ask for your help with a new problem. I am having problems with the removal of labels in a graph. What happens is that I have a matrix (of 3 columns) called "Nodes_et" that carries the x-y coordinates in its first 2 columns, while in the third it is named after the point to which those coordinates correspond. I have these lines of code that are helping me to generate and position the labels correctly (I leave part of the code and some images to better understand the situation I commented):
eti=text(Nodos_et(:,1)+0.1,Nodos_et(:,2)+0.1,num2cell(Nodos_et(:,3)) );
hold on;
As you observed the code fulfills its function, however I need to remove certain labels (depending on a condition that I have programmed) and I can not do them. Try reassigning the "Nodes_et" matrix to the values ​​you wanted to label, for example, the values ​​that the matrix carried minus the one in the second row remain, assuming this would eliminate the label that was in that second row, but it didn't work:
hold off;
Nodos_et(2,:) = [];
eti=text(Nodos_et(:,1)+0.1,Nodos_et(:,2)+0.1,num2cell(Nodos_et(:,3)) );
remains the same
Can anyone help me with this problem? Thank you.

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Adam 2019 年 8 月 8 日
Always keep hold of the handles to the graphics objects you create if you think you will later want to edit them in some way, it is a lot easier than messing around with having to find them again afterwards.
As Adam Danz says though you have to explicitly delete text objects, you can't just call text again with fewer elements and expect that it will replace all the ones you did previously with the new smaller list.
Pedro Guevara
Pedro Guevara 2019 年 8 月 8 日
Thank you very much for the reply. My programming is made so that when certain conditions are fulfilled, certain labels must be removed, these labels must be created and removed in compliance with the conditions that I have programs in the uitable that you see in the images. I leave this video to understand a little better how it works or what I intend to do:
The rows that are deleted from the tool must also delete the corresponding "nodes" (columns 4 and 5) that existed in the plot. This video was before it included the tags.
Could he ask for your help? I am not very aware of how is the handling of the - Function Handles -. Will it be very annoying if I ask you for an example of how it would be for the situation I am facing right now?
Adam Danz
Adam Danz 2019 年 8 月 8 日
I included an answer that shows how to store text object handles and how to delete them. You'll have to make some design decisions about how to best organize your code so you can keep track of which handles are associated with which rows of your UITable. That shouldn't be a problem. It looks like lines are also created/deleted based on the rows of your UITable. Text objects will work the same way as the lines.

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Adam Danz
Adam Danz 2019 年 8 月 8 日
編集済み: Adam Danz 2019 年 8 月 8 日
Text objects are just like any other graphics object. When you create a new text object, store its handle so you can later delete it. Here's an example.
th = text(.5, .5,'MyText');
% now delete it
If you're implementing this within a GUI and the function that deletes handles is different from the function that creates them, you'll need to store the text object handles somewhere. You can use guidata() for that.

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Pedro Guevara
Pedro Guevara 2019 年 8 月 9 日
It certainly has a relationship.
The doubt is the next one. When I run my program (after it has already put some labels) and it goes through the lines of code:
datos=str2double(t2); % "t2" is a variable of type cell that only contains the data that contains the data, fulfills an orthogonality condition that I have programmed for my uitable.
M= datos (:,6:9);
M([CelDig(1,1)],:)=[] ; % "CelDig (1,1)" is a value of a vector that saves the last position that was typed in the uitable. This line allows me to eliminate the row that does not meet my orthogonality condition
plot(x',y'); % Here the problem occurs, all my tags are deleted.
All my tags will be deleted, which I don't want since I have programmed a code that selectively removes the tags that I want to remove (read the comments that are the following lines of code):
fila_comp=V_org(celdas,1); % Corresponds to the ind of the row in my uitable that contains the nodes that I want to remove from the tags
B=datos (fila_comp,4:5); % "B" is a vector that stores the values ​​of the uitable (in columns 4-5)
for j=1:length(Nodos_et(:,3)) % "Nodos_et" is the matrix that carries my coordinates with its corresponding node
x(1,j) = str2double ( eti(j).String ); % "eti" is my variable of type -text array- that stores the labels of the introduced nodes.
for j=1:length(B)
if sum( find(x==B(1,j)) ) >=1
iry(j,1)=find(x==B(1,j)) ;
delete( eti(iry(j,1),1) );
eti([iry],:)=[]; % this line allows me to remove the rows from my vector "eti" that contained the nodes of the row that I want to delete ("row_comp")
Nodos_et([irx],:)=[]; % this line allows me to remove the rows from my array "Nodos_et" that contained the nodes of the row that I want to delete ("row_comp")
I leave images to better exemplify the situation, since it is a bit complicated to understand what I am trying to do:
Here all my tags are lost
Thank you. I hope you understand the subject quite well. I know it's complicated. :(
Rik 2019 年 8 月 9 日
My guess is that the NextPlot property is set to 'replace' instead of 'add'. If that is the cause you can either modify the property directly, or use hold('on') to get the same effect.
Also, always use target handles in a GUI. Almost every function allows you to set the parent object, plot is no exception.
Adam Danz
Adam Danz 2019 年 8 月 10 日
@Pedro, a few quick tips unrelated to your question;
  • reading screenshots of code is not fun. Whenever you're sharing relevant code, copy-paste it and make sure it's formatted using the [>] button.
  • sceenshots of your GUI may be helpful but I see at least 4 of them and at first glance 3 of them look identical. So instead of spending time helping with a solution, we have to spend a lot of time trying to understand what we are supposed to see. Always include a quick sentence or two (at least) such as "the image below shows....."
  • Less is more (usually). Most of the time volunteers here must ask for additional code, error messages, etc. so it's good to anticipate that and include it in your question. But it's also easy to overwhelm people with too many words and images.
From what I understand, your labels are disappearing as soon as another plot() command is executed. If that's the problem, I agree with Rik and the simple solution is to merely hold your axes.
hold(app.UIAxes, 'on')
% |__________| replace this with the handle to your axes

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