new to R coding.

Not quite sure what you were trying to do, but try the slight modification 
below and see if it works for you:
x = c (2434.1, 2463.7, 2451.6, 2444.5, 2431.3, 2436.3, 2412.6, 2417.9, 
2380.1,
  2366.2,
  2349.1, 2373.9, 2336.9, 2335.0, 2297.1, 2291.1, 2278.6, 2289.9, 2314.5, 
2328.8,
  2322.0, 2337.3, 2345.8, 2355.1, 2348.4, 2321.1, 2307.4, 2331.0, 2313.6, 
2286.9,
  2293.2, 2298.3, 2313.8, 2325.9, 2297.1, 2277.0, 2259.7, 2269.2, 2236.7, 
2249.3,
  2254.8, 2255.4, 2238.4, 2254.8, 2230.5, 2216.0, 2230.3, 2250.0, 2234.3, 
2222.8,
  2224.5, 2226.1, 2234.9, 2263.9, 2238.0, 2259.7, 2250.3, 2258.9, 2283.9, 
2298.2,
  2266.2, 2275.0, 2263.0, 2247.9, 2221.6, 2240.7, 2231.6, 2239.5, 2221.1)
#extraction of the stock index returns

n=length(x)
d=diff (log(x)) # daily log returns
# d is shorter than x
n=length(d)
# to get dx to index in the loop it must be defined before loop begins
dx = NULL
for (i in 2:n) {
dx[i]=(d[i])/(d[i-1])
# delta doesn't really do anything so I commented out
# delta=dx[i]
} # this is what I have tried to do.

-----Original Message----- 
From: tynashy
Sent: Monday, October 24, 2011 11:29 AM
To: r-help at r-project.org
Subject: Re: [R] new to R coding.

I am new to R coding and I am trying to model the returns on the ftse100
since 1990. I have got a vector with all the closing values on each trading
day. however, instead of using the difference in the closing values of two
consecutive days, (ie dx=diff(x) where x is the vector containing the
closing values), i wanted to use the quotient of the two closing values. I
have tried the following without any luck

new to R coding.

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