SQRT function doesn't work on uint16 image type

2014 12 10
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更新时间：2014 12 10
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So, my problem is: I have to load an image in png format an represent it as a matrix. I can do it with imread. But as soon as I performed function like sqrt it shows error message:
Undefined function 'sqrt' for input arguments of type 'uint16'
What should I do? Can somebody help?

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