[R] restructuring matrix

[yoooooo]

Hi all, 

    let's say I have matrix

People    Desc    Value
Mary      Height    50
Mary      Weight   100
Fanny    Height     60
Fanny     Height    200

Is there a quick way to form the following matrix? 

People   Height    Weight
Mary      50         100
Fanny     60        200

(Assuming I don't know the length of people/desc and let's say these are
characters matrix.. I tried play with row(), col(), etc.. but I don't seem
to find like a duplicate match function... 
I'm trying to write some one/two liner that convert my resulting matrix to
vector and pick the appropriate fields.. etc )

Thanks!

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