R help - Oct 2009 - rpois formula

Hi all,

It's been a while since i've used R and I can't remember how to do
the
following:

i have

a = rpois (100000, x)
b = rpois (100000, y)

what is the code to show that a>b, b>a and a=b to show just the number of
occurances?
at the moment when I type a>b I get a nice long list of true or false.

so i'm hoping to have the following

a>b
> 35000
b>a
> 25000
a=b
> 40000
thanks in advance
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try 
sum(a > b)
sum(b > a)
sum(a == b)

Ian


nedmt60 wrote:
> 
> i have
> 
> a = rpois (100000, x)
> b = rpois (100000, y)
> 
> what is the code to show that a>b, b>a and a=b to show just the
number of
> occurances?
> at the moment when I type a>b I get a nice long list of true or false.
> 
-- 
View this message in context:
http://www.nabble.com/rpois-formula-tp25774389p25779305.html
Sent from the R help mailing list archive at Nabble.com.

Or:
  a = rpois (100000, 0.1)
  b = rpois (100000, 0.15)

table(a>b, a==b, b>a)

And if you look at that output a bit:

table(a<b,a==b )[c(1,3,2)]  # for a>b, b>a and a=b .
# 79049 12712  8239   .. since FALSE < TRUE
--

On Oct 6, 2009, at 9:49 PM, Ian Fiske wrote:
>
> try
> sum(a > b)
> sum(b > a)
> sum(a == b)
>
> Ian
>
>
> nedmt60 wrote:
>>
>> i have
>>
>> a = rpois (100000, x)
>> b = rpois (100000, y)
>>
>> what is the code to show that a>b, b>a and a=b to show just the  
>> number of
>> occurances?
occurrences?
>> at the moment when I type a>b I get a nice long list of true or  
>> false.
As you _should_ when you supply two vectors to a binary operator.
>>
>
> -- 

David Winsemius, MD
Heritage Laboratories
West Hartford, CT

nedmt60 wrote:
> Hi all,
>
> It's been a while since i've used R and I can't remember how to
do the
> following:
>
> i have
>
> a = rpois (100000, x)
> b = rpois (100000, y)
>
> what is the code to show that a>b, b>a and a=b to show just the
number of
> occurances?
> at the moment when I type a>b I get a nice long list of true or false.
>
> so i'm hoping to have the following
>   
 > a = rpois (100000, 2)
 > b = rpois (100000, 3)
 > table(sign(a-b))

   -1     0     1
58712 16550 24738

Duncan Murdoch
> a>b
>   
>> 35000
>>     
> b>a
>   
>> 25000
>>     
> a=b
>   
>> 40000
>>     
>
> thanks in advance
>