R help - Apr 2007 - Query about using rowSums/ColSums on table results

Hi
I have data of the form
class age
A      0.5
B      0.4
A      0.56666
C      0.785
D      0.535
A      0.005
C      0.015
D      0.205
A      0.605

etc etc...

I tabulated the above
as
tab <-table(data$class, cut(data$age, seq(0,0.6,0.02))

I wish to view the results in individual bins as a
percentage of the points in each bin.
So I tried
tab/colSums(tab)

However that is yielding Inf as a return value in
places where clearly the result should be a non-zero
value.

Is there an alternate way to get the results in each
bin as percentages of the total points in that
age-bin?

Thanks
Lalitha

Try

prop.table(tab, 1)
prop.table(tab, 2)
prop.table(tab)

for the three ways of taking fractions or see ?CrossTable in the
gmodels package.

On 4/30/07, lalitha viswanath <lalithaviswanath at yahoo.com>
wrote:
> Hi
> I have data of the form
> class age
> A      0.5
> B      0.4
> A      0.56666
> C      0.785
> D      0.535
> A      0.005
> C      0.015
> D      0.205
> A      0.605
>
> etc etc...
>
> I tabulated the above
> as
> tab <-table(data$class, cut(data$age, seq(0,0.6,0.02))
>
> I wish to view the results in individual bins as a
> percentage of the points in each bin.
> So I tried
> tab/colSums(tab)
>
> However that is yielding Inf as a return value in
> places where clearly the result should be a non-zero
> value.
>
> Is there an alternate way to get the results in each
> bin as percentages of the total points in that
> age-bin?
>
> Thanks
> Lalitha
>
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