r - function to get the power of a number -

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looking way floating point number power of 10 noted

6.45e-8 - 8

3.21e-4 4

0.013 2

or minus in

is ther e function following instead of multiplying 6.45e_8 @ first dividing 1e-8 , multiply (6.45e-8/1e8=...).

how 

floor(log10(x))

? log10 computes log base 10, floor finds next smaller integer.


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