i have a table like this of an value and its tolerance

length   delta-length
12.2232  0.4
123.422  0.034123
1234     12

i want to round the value to the significant digits in this way:

my-round(length,delta-length)

12.2   ,  0.4
123.42 ,  0.03
1234   ,  12

how can i do this with R? 

please CC to email,
thanks so far,

-- 
Jonas Stein <[EMAIL PROTECTED]>

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