Hi Steve,
You probably want to check out ?by or ?aggregate, maybe using
(rownames(df) %/% 60) : (colnames(df) %/% 60) as your index variable.
--Adam
On Sun, 7 Sep 2008, Steve Murray wrote:
Dear all,
I have a large dataset which I hope to reduce in size, to make it more
useable. I h
I'm not sure I exactly understand your problem, but if you are
looking for a recursive algorithm for calculating the average by
addition of one record only at a time, consider:
y[k] = y[k-1] + (x[k] - y[k-1])/k, where y(0) = 0, k = 1, 2, ...
At each stage, y[k] = (x[1]+...+x[k])/k.
At 0
Here is a way to do it by reading in 60 lines at a time and computing the means:
# create some test data
n <- 360
x <- matrix(runif(360*16800), nrow=16800)
cat(x, file="/tempxx.txt")
# now process the data 60 lines at a time, averaging each 60x60 block
result <- matrix(0, nrow=6, ncol=280)
nextL
Gabor - thanks for your suggestion... I had checked the previous post, but I
found (as a new user of R) this approach to be too complicated and I had
problems gaining the correct output values. If there is a simpler way of doing
this, then please feel free to let me know.
Dylan - thanks, your
Gabor - thanks for your suggestion... I had checked the previous post, but I
found (as a new user of R) this approach to be too complicated and I had
problems gaining the correct output values. If there is a simpler way of doing
this, then please feel free to let me know.
Dylan - thanks, your
On Sun, Sep 7, 2008 at 12:32 PM, Steve Murray <[EMAIL PROTECTED]> wrote:
>
>
> Dear all,
>
> I have a large dataset which I hope to reduce in size, to make it more
> useable. I hope to do this by taking an average of each 60 x 60 blockof
> values and forming a new data frame out of the averaged v
This was answered last month:
http://tolstoy.newcastle.edu.au/R/e4/help/08/08/19091.html
On Sun, Sep 7, 2008 at 3:32 PM, Steve Murray <[EMAIL PROTECTED]> wrote:
>
>
> Dear all,
>
> I have a large dataset which I hope to reduce in size, to make it more
> useable. I hope to do this by taking an av
Dear all,
I have a large dataset which I hope to reduce in size, to make it more useable.
I hope to do this by taking an average of each 60 x 60 blockof values and
forming a new data frame out of the averaged values.
How would I go about taking averages of 60 x 60 'blocks' in R, and cycling
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