[R] Help on percentage of random numbers for different classes

[Greg Hirson]

Kabeli,

Try sample (see ?sample) and set the prob argument to have larger 
probabilities for bigger numbers:

set.seed(5)
x = sample(1:10, 100, prob = c(.03, .03, .04, .05, .05, .05, .15, .2, 
.2, .2), replace=TRUE)

 >table(x)

x
 1  2  3  4  5  6  7  8  9 10
 4  3  7  5  9  3 10 18 24 17

Does that get you what you need?

Greg

KABELI MEFANE wrote:
> R-list
>  
> I am sorry for asking this stupid question, but i have been running in circles. I want to randomly generate a scaling point of between 1 and 10, for say hundred entries, where the first 10% percent is has rates between 2 and 7, the next 15% 3 and 7, 20% between 3 and 9, 20% between 3 and  10, 35% between 5 and 10. The problem is that i can only generate the usual 100 using runif function
>  
>  > y<-c(ceiling(10*runif(100)))
>   
>> y
>>     
>   [1] 10  8  5  2  4  1  6  7  1  6  8  8  8  9  7  7  8  8  2  7  3 10  1  7  1
>  [26] 10  4  8  8  8  9  3  7  8  4  6  7  2  3  1  9  8  2  6  7  4  8  8  9  7
>  [51]  6  5  4  1  8  7  9  8 10  5  3  7  5  5  4  4  7  4 10  4  9  1  5 10 10
>  [76]  5  5 10  7  3  4  4  9 10  6  2  6  6  6  3  8  2  2  4  4 10  6  9  4  3
>
> I just want to try to avoid small numbers as much as possible. I am open to suggestions, please please please.
>  
> Kabeli
>
>
>       
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>
>   
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-- 
Greg Hirson
ghirson at ucdavis.edu

Graduate Student
Agricultural and Environmental Chemistry

1106 Robert Mondavi Institute North
One Shields Avenue
Davis, CA 95616