Hi,

You can initialize a counter and update it in the loop. An silly example

(unrelated to yours because it was not reproducible) of this technique is:

x <- matrix( , ncol = 2, nrow = 26)

n <- 0

for(i in letters) {

n <- n+1

x[n,] <- c(i, n)

}

Best,

Ista

On Sunday, February 12, 2012 07:17:33 AM jolo999 wrote:

> Dear all,

>

> i have daily stock prices for more than 10 years and want to compute annual

> volatilities for certain dates during this period. Since i have found no

> "easy" way to work with time data, the data presents itself in the structure

>

> TIme Index - Stock Price

> 1 - 15,6

> 2 - 17

> ...

> ...

> 2010 - 28

> 2011- 28,5

> ...

> 4500 - 23

>

> Since I want to have the volatility only for certain dates, I define these

> dates in a vector

>

> Deal_Dates <- c(500,600,700,805)

>

> and use the for-command to calculate these specific volatities via

>

> for(i in Deal_Dates){Volatility(i)}

>

> My problem is now, that I want to save the results in a new matrix which i

> created in the structure

>

> results <- matrix(rep(NA,4*2),4,2) in a way that

>

> Time Index - Volatility

> 500 - 0.55

> 600 - 0.44

> 700 - 0.45

> 805 - 0.66

> is stored in the results matrix.

>

> How can I save the result of each for-loop in the matrix? I want the

> respective Time-Index of the loop to be put in the first column and the

> volatility in the second column. Since my vector for the for-loop consists

> of "random" values for the Time-Index, i can't write

>

> resultsl[i,1] = Time Index and

> results[i,2] = Volatility

>

> I am looking for something that gives me the current round or iteration of

> the for-loop in order to replace the "i" in adressing the cells of the

> result matrix.

>

> Hope you can help!

>

>

> --

> View this message in context:

>

http://r.789695.n4.nabble.com/Counting-the-loop-round-of-a-for-loop-tp43813> 19p4381319.html Sent from the R help mailing list archive at Nabble.com.

>

> ______________________________________________

>

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>

https://stat.ethz.ch/mailman/listinfo/r-help> PLEASE do read the posting guide

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https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide

http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.