r - Arguments not being passed to a function within a function -


i having trouble passing arguments function within function. values of arguments not being passed instead "n" , "x[i]" are.

a <- function(n){    x=rep(0:n)   for(i in x){     x[i]=cgcd(n,x[i])   }   return (sum(x)/(n+1))  }  cgcd <- function(n,m){    if((m==n) || (m==0)){     return (1)   }else{     r = n %% m     return (1 + cgcd(m,r))   } }

my error:

a(10)     error in if ((m == n) || (m == 0)) { :        missing value true/false needed

your problem not values not being passed properly. can check adding print statements:

a <- function(n){    x=rep(0:n)   for(i in x){     x[i]=cgcd(n,x[i])   }   return (sum(x)/(n+1))  }  cgcd <- function(n,m){   print(n)  # added debugging   print(m)  # added debugging   if((m==n) || (m==0)){     return (1)   }else{     r = n %% m     return (1 + cgcd(m,r))   } }

this gives following output:

a(10) [1] 10 integer(0) error in if ((m == n) || (m == 0)) { :    missing value true/false needed

no, there 2 problems @ work here:

  1. the for (... in ...) construct gives value of entry in list, not index.
  2. array indices in r begin @ 1 rather 0.

fixing these:

a <- function(n){    x=rep(0:n)   (i in 1:length(x)) {  # index 1 10, rather values of x, zeros.     x[i]=cgcd(n,x[i])   }   return (sum(x)/(n+1))  }  cgcd <- function(n,m){    if((m==n) || (m==0)){     return (1)   }else{     r = n %% m     return (1 + cgcd(m,r))   } }

and output might expect:

a(10) [1] 2.545455

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