### Wednesday, March 15, 2006

## RE: st: Re: summing up digits and comparing to a check digit

gen x = string(myvar, "%07.0f")

gets you there in one.

Nick n.j.cox@durham.ac.uk

Austin Nichols > I agree wholeheartedly with Michael Blasnik's opening caveat--was your > example 12050457 => 0+5+0+4+5+7=21/10=2+1 => check digit=1 supposed to > be 1050457 => 0+5+0+4+5+7=21/10=2+1 => check digit=1 by any chance? > > As for his solution, it works well except when digits may be fewer > than 6 digits when turned into strings--I would replace his second > line with > replace x=substr("0000000",1,7-length(x))+x > to pad numbers out to y digits with leading zeros, and then > add another line > assert length(x)==7 > to make sure there are no odd cases. > > . li m x c, noo clean > > myvar x check > 105059 0105059 0 > 2459 0002459 0 > 7102059 7102059 7 > > On 3/15/06, Michael Blasnik <michael.blasnik@verizon.net> wrote: > > I'm not sure I understand the problem -- one of your > examples is an 8 digit > > number but you say you have 7 digit numbers. Anyway, here > is some "highly > > advanced programming" (?) : > > > > gen x=string(myvar) > > replace x="0"+x if length(x)==6 > > gen > > > check=mod(real(substr(x,2,1))+real(substr(x,3,1))+real(substr( > x,4,1))+real(substr(x,5,1))+real(substr(x,6,1))+real(substr(x, > 7,1)),10) > > > > make sure to remove any line break that the email puts in > the last line.

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