On Sep 7, 2010, at 10:05 PM, stephen sefick wrote:
I'm sorry. In the
bkf_max <- grep(max(measure_bkf_not_zero[,"bankfull_depths_m"]),
measure_bkf_not_zero[,"bankfull_depths_m"])
it is giving the indexes for 1 5 10 15 16
And it was supposed to yield ... what?
I think this is because grep encounters a 1 with either 0.
Huh?
or nothing
in front of it. I would like to find the max and then then the
closest (leftmost) which is why the ifelse statment follows.
grep is for working with character vectors. It seems to work when
given numerics as patterns, but with floating point representations it
seems really dangerous. I'm rather amazed you got anything vaguely
useful. (And see further negative comments on that strategy below.)
If you want the max of a numeric vector, then use max or which.max if
you want the index. If you want the next largest then use max( vector[-
which.max(vector)] ). So as Jim Holtman's tag line says: what problem
are you trying to solve?
Again, I am sorry for being vague. I get wrapped up in a problem and
forget that I need to communicate.
kindest regards,
Stephen
On Tue, Sep 7, 2010 at 8:48 PM, David Winsemius <dwinsem...@comcast.net
> wrote:
On Sep 7, 2010, at 9:37 PM, stephen sefick wrote:
Here is a striped down example that is not working
That dreadful phrase... "is not working". When the ESP package
comes to
fruition, life will be so easy. Until then ... the English language
is
necessary. Where am we supposed to be looking. Did I miss you
saying which
of those (unprinted) objects we should be fixing.
because of the 1.00
to 1. Any help would be greatly appreciated.
measure_bkf <- (structure(list(measurment_num = c(0, 0.2, 0.4, 0.6,
0.8, 1, 1.2,
1.4, 1.6, 1.8, 2, 2.2, 2.2, 2.4, 2.6, 2.8), bankfull_depths_m =
c(-0.15,
-0.09, -0.00999999999999998, 0.06, 0.13, 0.26, 0.36, 0.46, 0.56,
0.61, 0.85, 0.93, 0.93, 0.97, 1, 1)), .Names = c("measurment_num",
"bankfull_depths_m"), row.names = c(32L, 1L, 2L, 3L, 4L, 5L,
6L, 7L, 8L, 9L, 10L, 11L, 29L, 12L, 13L, 14L), class =
"data.frame"))
measure_bkf_not_zero <- measure_bkf[grep("[^0]",
measure_bkf[,"bankfull_depths_m"]),]
You have constructed an odd pattern with the square brackets around
caret-zero. Per the regex page: "A character class is a list of
characters enclosed between [ and ] which matches any single character
in that list; unless the first character of the list is the caret ^,
when it matches any character not in the list" You are trying to find
any number with a non-zero in a numeric vector? That seems to be what
happened.
bkf_min <- grep(min(measure_bkf_not_zero[,"bankfull_depths_m"]),
measure_bkf_not_zero[,"bankfull_depths_m"])
bkf_max <- grep(max(measure_bkf_not_zero[,"bankfull_depths_m"]),
measure_bkf_not_zero[,"bankfull_depths_m"])
bkf_min <- ifelse(length(bkf_min)>1, bkf_min[1], bkf_min)
bkf_max <- ifelse(length(bkf_max)>1, bkf_max[1], bkf_max)
#s <- with(measure_bkf_not_zero, approx(measurment_num,
bankfull_depths_m,
xout=seq(measure_bkf_not_zero[bkf_min,"measurment_num"],
measure_bkf_not_zero[bkf_max,"measurment_num"], length=2000)))
#int_bkf <- with(s, x[which.min(y[y>0])])
s <- with(measure_bkf_not_zero[bkf_min:bkf_max,],
approxfun(bankfull_depths_m, measurment_num), ties=mean)
int_bkf <- s(0)
On Tue, Sep 7, 2010 at 8:28 PM, David Winsemius <dwinsem...@comcast.net
>
wrote:
On Sep 7, 2010, at 9:06 PM, stephen sefick wrote:
s <- 1.00
max(s)
sprintf("%.2f", max(s))
[1] "1.00" @ as a string/character object
returns 1
is there anyway that I can get it to return 1.00. I am using the
results of this max statement in a grep statement and it returns
the
wrong numbers, I will provide more information and code if it
would
make more sense in context.
-- Stephen Sefick
____________________________________
| Auburn University |
| Department of Biological Sciences |
| 331 Funchess Hall |
| Auburn, Alabama |
| 36849 |
|___________________________________|
| sas0...@auburn.edu |
| http://www.auburn.edu/~sas0025 |
|___________________________________|
Let's not spend our time and resources thinking about things
that are
so little or so large that all they really do for us is puff us
up and
make us feel like gods. We are mammals, and have not exhausted
the
annoying little problems of being mammals.
-K. Mullis
"A big computer, a complex algorithm and a long time does not
equal
science."
-Robert Gentleman
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
--
Stephen Sefick
____________________________________
| Auburn University |
| Department of Biological Sciences |
| 331 Funchess Hall |
| Auburn, Alabama |
| 36849 |
|___________________________________|
| sas0...@auburn.edu |
| http://www.auburn.edu/~sas0025 |
|___________________________________|
Let's not spend our time and resources thinking about things that
are
so little or so large that all they really do for us is puff us up
and
make us feel like gods. We are mammals, and have not exhausted the
annoying little problems of being mammals.
-K. Mullis
"A big computer, a complex algorithm and a long time does not equal
science."
-Robert Gentleman
David Winsemius, MD
West Hartford, CT
--
Stephen Sefick
____________________________________
| Auburn University |
| Department of Biological Sciences |
| 331 Funchess Hall |
| Auburn, Alabama |
| 36849 |
|___________________________________|
| sas0...@auburn.edu |
| http://www.auburn.edu/~sas0025 |
|___________________________________|
Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods. We are mammals, and have not exhausted the
annoying little problems of being mammals.
-K. Mullis
"A big computer, a complex algorithm and a long time does not equal
science."
-Robert Gentleman
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
