Yes, it just makes it more readable.
On Sat, Jul 18, 2009 at 9:55 PM, Mark Knecht wrote:
> Yes, I sort of guess at that one and found the answer. I don't quite
> really get what this 'with' command is really doing. It seems that I
> could have written something like out$Final <- out$Initial+out$Of
Yes, I sort of guess at that one and found the answer. I don't quite
really get what this 'with' command is really doing. It seems that I
could have written something like out$Final <- out$Initial+out$Offset.
(Untested.) I guess it's primarily a way of not having to write the
data.frame's name and
Regarding the Final column the last line should have been
out$Final <- with(out, Initial + Offset)
On Sat, Jul 18, 2009 at 8:33 PM, Mark Knecht wrote:
> Very interesting. Thanks. Very concise! interesting use of cumsum.
> I'll have to see if I can work that into my real code where I need to
> tak
Hi,
No, it's not about cumsum specifically. It's about building up the
list as the events go by.
I managed to create this code but it does depend on a for loop.
Notice how the Final value on each row becomes the Initial value on
the next row. Basically I want to build a data.frame with 5-10
Very interesting. Thanks. Very concise! interesting use of cumsum.
I'll have to see if I can work that into my real code where I need to
take a conditional cumsum. I think it will work.
On my system the Final column doesn't seem quite right but that's OK.
There's enough here for me to study and I
Here `out` is the same as the final value of `MyDF` in your code
using cumsum() instead of a loop:
set.seed(123)
DF <- data.frame(cbind(Event= 1:10, Initial=0,
Offset=round(100*rnorm(10), 0), Final=0 ))
out <- transform(DF, Initial = 1 + c(0, head(cumsum(DF$Offset), -1)))
out$Final <- with(
I am not entirely clear on what you want to do but
if you simply want a cumulative sum use cumsum:
cumsum(rep(100, 5)) + 1
or to do cumsum using Reduce and + try:
Reduce("+", rep(100, 5), init = 1, acc = TRUE)
On Sat, Jul 18, 2009 at 3:59 PM, Mark Knecht wrote:
> Hi Gabor,
> Thanks fo
Hi Gabor,
Thanks for the pointer to Reduce. It looks quite interesting. I
made an attempt to use it but I'm not clear how I would move the
output of the Reduce execution on row 1 to become the Initial value on
Row 2. In this output:
> MyDF
Event Initial Offset Final
1 1 1-31
See ?Reduce
On Fri, Jul 17, 2009 at 11:10 PM, Mark Knecht wrote:
> Hi,
> Is it possible to make something like the following code actually
> work? My goal in this example would be that I'd see results like
>
> 1 1 10100
> 2 10100 10200
> 3 10200 10300
> 4 10300 10400
>
> In r
Hi,
Is it possible to make something like the following code actually
work? My goal in this example would be that I'd see results like
1 1 10100
2 10100 10200
3 10200 10300
4 10300 10400
In real usage the function would obviously do a lot more work, but the
question I canno
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