How can I add text to a plot?

Question

Lukas 2014-2-4

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https://ww2.mathworks.cn/matlabcentral/answers/114752-how-can-i-add-text-to-a-plot

评论： DONA MERIN JOY 2017-3-21

I want to add some text to my graph. I have been through lots of documentation of the text() command. For some reason it just doesn't want to work. I know that sounds like I haven't tried fixing it myself but I have and I'm at a complete loss.

I have tried running the exact example code in the documentation and I receive one of two errors.

??? Subscript indices must either be real positive integers or logicals.
Error in ==> Untitled2 at 2
text(pi,0,' \leftarrow sin(\pi)','FontSize',18)

Or if I make them positive and real integers

??? Index exceeds matrix dimensions.
Error in ==> Untitled2 at 2
text(1,1,' \leftarrow sin(\pi)','FontSize',18)

The example code that I tried running on my PC from the documentation:

plot(0:pi/20:2*pi,sin(0:pi/20:2*pi))
text(pi,0,' \leftarrow sin(\pi)','FontSize',18)

Here is a link to the documentation with the correct output.

http://www.mathworks.com/help/matlab/ref/text.html

Thanks

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Mischa Kim 2014-2-4

Lukas, is the error really referring to the text command? How does the rest of the code look like?

What MATLAB version are you using on what platform?

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Answer 1

Robert Cumming 2014-2-4

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在 MATLAB Online 中打开

Is text a variable in your workspace?

Type:

whos text

In the command line to check.

clear text

To clear the variable -> then try the example from the documentation again.

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Answer 2

David Sanchez 2014-2-4

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在 MATLAB Online 中打开

The error message you pasted refers to a *.m file called Untitled2.m.

Do the following and tell us what you get:

On the command window:

clear all
plot(0:10,0:10)
text(5,5,'TEST TEXT')

Your error message has nothing to do with the text command.

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Anand 2014-4-25

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Hi, I have managed to read and display text within a running AVI video file, but now i want to only add text to certain frames...e.g frame 1-20 and 30-40....is there any way i can i can add text from one frame to another instead of it displaying throughout the whole video.

thank you.

Title_={'Smile'};
hText = text(x,y,'string');
imshow(Background);     
text(40,100,Title_{1},'Color','r','FontWeight','Bold','FontSize',40);
delete(htext);

DONA MERIN JOY 2017-3-21

how can i display a word in figure window in matlab

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Answer 3

Lukas 2014-2-4

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Ah thanks Robert. Yes I must have created a variable somewhere called text. I'm sure the clear all command would have worked as well thanks David. I will always use it from now on.

Thanks everyone.