text() error. Any work around ?

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Scott Urquhart
Scott Urquhart 2015-11-13
评论： Walter Roberson 2015-11-14
Hello,
I am encountering what I think is a bug.
figure(1)
plot(1:10,1:10)
MapEfieldTxt=text([3,6],[3,6],{'Name1','Name2'});
pos2=get(MapEfieldTxt,'Position');
str2=get(MapEfieldTxt,'String');
set(MapEfieldTxt,'Position',pos2,'String',str2)
This return :
Error using matlab.graphics.primitive.Text/set
While setting the 'Position' property of 'Text':
Value must be a 2 or 3 element vector of numeric or logical type
I get the 'Position' and the 'String' from the handle and set it back right after it without modification and it return this error. There is something wrong in the output/input format.
Does anyone knows a work around ?
Thanks

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回答（2 个）

Image Analyst
Image Analyst 2015-11-14
I don't know why you're doing all that weird complicated stuff when it looks like you simply want to place two text strings on the plot. So simply use text() the way the vast majority of MATLAB users do:
text(3, 3, 'Name1');
text(6, 6, 'Name2');
  2 个评论
Scott Urquhart
Scott Urquhart 2015-11-14
I have more than hundreds Name to display.
Image Analyst
Image Analyst 2015-11-14
So what? Though your plot might get very cluttered. text() can be called hundreds of times, or once inside a loop. It can even be called with a variable as the third, text string argument. For example
for k = 1 : 200
x = k;
y = 3*k; % whatever....
theLabel = sprintf('Name%d', k);
text(x, y, theLabel);
end

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Walter Roberson
Walter Roberson 2015-11-14
At least in R2014a, when you pass multiple coordinates to text(), you get back a vector of handles, not a single handle.
  1 个评论
Walter Roberson
Walter Roberson 2015-11-14
Because you are getting a vector of handles, when you get() the Position property of the vector of handles you are going to get a cell array. You then try to set() the Position property of the vector of handles to that cell array, which is not permitted. You will need to loop setting the location and string property per-handle.

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