# [R] simple simulation problem

Yannick Wurm idh at poulet.org
Sun Mar 17 22:31:32 CET 2002

```Help!

I'm desperate! I don't understand why my function won't work!
Its for a simple simulation exercise: robin hood fires an arrow
at a target with 50cm radius, and his aim follows a centered
normal distribution with a standard deviation of 40cm (on x and
y axis, independently). Here he takes 10 shots and is awarded
points if he hits close to the center.

For some reason, this function always returns a score of 870?!?!
I'm probably missing something really quite obvious but I just
can't figure out what it is.

thanks for your help (you guys are great!),

Yannick.

function(){
score_0
x_rnorm(10, mean=0, sd=40)
y_rnorm(10, mean=0, sd=40)
d_sqrt(x^2 + y^2)
for(i in 1:10) {
if (d[i] > 50) print("désolé\n")
if (40 < d[i] < 50) score_sum(score,2)
if (25 < d[i] < 40) score_sum(score,5)
if (15 < d[i] < 25) score_sum(score,10)
if ( 5 < d[i] < 15) score_sum(score,20)
if ( 0 < d[i] <  5) score_sum(score,50)
}
print(d)
print(score)
}

------------------------------------
yannick.wurm at insa-lyon.fr
http://homepage.mac.com/yannickwurm/
tel: 06.16.41.71.92    icq: 22044361

-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._

```