[R] How many digits are there in left of dot of 0.0001 ?

[JS Huang]

Hi,

  I assume you want to know the digit count to the left of decimal point. 
If this is the case, then you may use  trunc(log10(max(1,trunc(abs(a)))))+1
for a numerical variable a.  Count 0.12 as having one digit to the left of
decimal point.

> trunc(log10(max(1,trunc(abs(-100000.99)))))+1
[1] 6
> trunc(log10(max(1,trunc(abs(0)))))+1
[1] 1
> trunc(log10(max(1,trunc(abs(9.999)))))+1
[1] 1
> trunc(log10(max(1,trunc(abs(19.999)))))+1
[1] 2
> trunc(log10(max(1,trunc(abs(-1999.999)))))+1
[1] 4



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