Using text function in a for loop

Question

Raldi 2012-5-12

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/38164-using-text-function-in-a-for-loop

Hi, what i want to ask is how can i use the text function inside a loop and make it print the number of iterations? like this

for i = 1:4

----some code----

text(pos1,pos2,i)

end

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Oleg Komarov 2012-5-12

Where do you want it printed? If on a graph, then you're on the right track. Do you want to keep the iteration already printed or you want to update it?

If you want to print it in the command window use disp or sprintf.

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Answer 1

Image Analyst 2012-5-12

1
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https://ww2.mathworks.cn/matlabcentral/answers/38164-using-text-function-in-a-for-loop#answer_47619

在 MATLAB Online 中打开

Don't use i (the imaginary variable) for your loop index.

I handle a number of situations below.

for k = 1:1000
  caption = sprintf('The value of k is %d', k);
  % Print to command window.
  fprintf('%s\n', caption);
  % Print to static text control on a GUI.
  set(handleToText, 'String', caption);
  % Print to the overlay of an image or plot.
  text(5, 10, caption);
  % Force it to repaint the screen immediately.
  drawnow;
end

Note the use of drawnow. If you're in an intensive loop, it often won't take time out to repaint your GUI until it's done with the loop. Thus you won't see any update on your screen. To get around this, use the drawnow command to force it to update/refresh/repaint the screen each time it's called.