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How to write an automatically generated text on an image in matlab?

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Shinobu
Shinobu 2017-2-18
评论： Shinobu 2017-2-19
Hello.
I have an image with a number on it. I have detected and recognised the number in the picture and I would like to write the number matlab has recognised on the image. I tried using the text() command but in vain.
I wrote it as such :
text(120, 40, '%s', letter)
But this is wrong. Can anyone please help me with the syntax if what I want to be written in the image is stored in the variable 'letter'?
Can anyone please help me?
Thank you.

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Walter Roberson
Walter Roberson 2017-2-18
text(120, 40, letter)

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