1 个投票

I want to put a text on a plot using the following code:
x_pos=0.0031;
y_pos=0.0507
str_=['R^2 (%) = ' num2str(R_squared)];
text(x_pos,y_pos , str_)
it used to work but now it refuses to work and gave me the following error:
??? Error using ==> text
Not enough input arguments.
However, if I use the following code, it will work:
text(0.0031, 0.0507 , str_)
I don't know what the problem is. Could you please help me about that?

请先登录，再回答此问题。

 采纳的回答

Matt Fig
Matt Fig 2011-4-27

1 个投票

Works here:
clear all,close all,clc
R_squared = .5;
x_pos=0.0031;
y_pos=0.0507;
str_=['R^2 (%) = ' num2str(R_squared)];
text(x_pos,y_pos , str_)
I see some text on an axes...
%
%
%
EDIT
I see what you mean now. I get the same error when y is single. If x is single, I get a different error. As I don't see this documented anywhere, I wonder if it is a bug. For now, doing this will make sure you get your text:
text(double(x_pos),double(y_pos),str_)
%
%
%
%
EDIT#2
I think this is buggy. This works with singles, but the other calling format, see above, doesn't:
R_squared = .5;
x_pos=single(0.0031);
y_pos=single(0.0507);
str_=['R^2 (%) = ' num2str(R_squared)];
text('position',[x_pos,y_pos] ,'string',str_)

11 个评论
显示 9更早的评论 隐藏 9更早的评论

Hassan
Hassan 2011-4-27
thnaks Matt for the comment. I did that but I still get the same error. the type of x_pos is double and y_pos is single. I converted x_pos to single to see if it fix the error but it didn't.
Matt Fig
Matt Fig 2011-4-27
Try this:
text(double(x_pos),double(y_pos) , str_)
Matt Fig
Matt Fig 2011-4-27
When I pass a single value for either x or y or both I get an error.
If only y is single, I get the error about not enough inputs.
If only x is single, I get invalid property/value pair.
Is this a bug?
Hassan, what MATLAB version are you using?
Hassan
Hassan 2011-4-27
if I use the same thing you did I don't get an error but if I use my own data I'll get the error. Here's a subset of my data:
X=[0.0317197366079450
0.0164593809477460
0.00843903002655300
0.0104984758966280
0.00635047132957800]
y=[0.01150000
0.005500000
0.004000000
0.009400000
0.006900000]
R_squared=0.500000000000000
x_pox=0.00133576536015362
y_pos=0.01006250
str_= 'R^2 (%) = 0.5'
scatter(X,Y)
text(x_pos,y_pos , str_)
Hassan
Hassan 2011-4-27
I'm using Matlab 2009a.
Hassan
Hassan 2011-4-27
It confused me a lot. I thought there's something wrong with the code. thanks a lot Matt.
Matt Fig
Matt Fig 2011-4-27
Did you see my previous comment, and above edits?
You said that y_pos was single, but the above code you paste does not show this. In any case, see my above edits and see if that helps.
Hassan
Hassan 2011-4-27
yes Matt, I saw your comments. I changed x_pos and y_pos to double, as you suggested, and now it's working fine. I just copied the value for x_pos and y_pos from a subset of my data and from Workspace window, the data type may have changed due to that.
Matt Fig
Matt Fig 2011-4-27
O.k., I still think this could be a bug.
Hassan
Hassan 2011-4-27
you mean it's an error caused by Matlab? I'm quite new to Matlab and if I see an error it takes time to figure out the problem.
Matt Fig
Matt Fig 2011-4-27
By bug I mean:
Most MATLAB functions nowadays work with either single or double.
The documentation for TEXT does not specify that the inputs must be of type double.
One calling format works fine with single values, the other doesn't.
If this is not a bug, it is at least inconsistent.

请先登录，再进行评论。

更多回答（2 个）

Chethan Pandarinath
Chethan Pandarinath 2013-12-31

0 个投票

Just wanted to confirm that I see this issue in MATLAB R2012b: text() fails if either of the passed in x- or y-position arguments is a single (and it fails with a non-sensical "Not enough input arguments" error). Casting x- and y-position to double fixes the problem.
Agreed with Matt that this should be marked as a bug, as there is nothing in the documentation specifying that the x and y position arguments must be doubles.
Thank you for your post and for the workaraound.
Sumana
Sumana 2023-11-27

0 个投票

My code is:
for i = 1:length(props)
% Extract bounding box and centroid information
boundingBox = props(i).BoundingBox;
centroid = props(i).Centroid;
% Text to be displayed
textToDisplay = sprintf('Object %d', i);
% Add text to the image
text(centroid(1), centroid(2), textToDisplay, 'Color', 'r', 'FontSize', 10, 'FontWeight', 'bold');
end
i am supposed to receive an image where bounding box and centroid will be displayed, but i am getting a white image having x and y axis, please tell me the reason

类别

在 帮助中心 和 File Exchange 中查找有关 Deep Learning Toolbox 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by