Find the negative entries in a array.

Hi everybody! I am new to Matlab and I have been using it for like one week. Now I got stuck because I need to individuate the negative entries of an array in order to modify them: I wonder then if there's a way to get the position (row and column) of these entries in the array of interest.
Thanks in advance!

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2014-3-31

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2014-3-31

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