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2.54.6  Numeric evaluation : evalf

evalf takes as argument an expression or a matrix.
evalf returns the numeric value of this expression or of this matrix.
Input :

evalf(sqrt(2))

Output :

1.41421356237

Input :

evalf([[1,sqrt(2)],[0,1]])

Output :

[[1.0,1.41421356237],[0.0,1.0]]

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