Displaying 7 results from an estimated 7 matches for "colmax".
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colmar
2012 Apr 19
4
Column(row)wise minimum and maximum
Hi,
Currently, the "base" has colSums, colMeans. It seems that it would be useful to extend this to also include colMin, colMax (of course, rowMin and rowMax, as well) in order to facilitate faster computations for large vectors (compared to using apply). Has this been considered before? Please forgive me if this has already been discussed before.
Thanks,
Ravi
Ravi Varadhan, Ph.D.
Assistant Professor
The Center on Aging...
2009 Sep 19
1
matrix operations on grobs and grid units
...pha,"testing very large width", hat(beta),
integral(f(x)*dx, a, b))
rowMax.units <- function(u, nrow){ # rowMax with a fake matrix of units
matrix.indices <- matrix(seq_along(u), nrow=nrow)
do.call(unit.c, lapply(seq(1, nrow), function(ii) {
max(u[matrix.indices[ii, ]])
}))
}
colMax.units <- function(u, ncol){ # colMax with a fake matrix of units
matrix.indices <- matrix(seq_along(u), ncol=ncol)
do.call(unit.c, lapply(seq(1, ncol), function(ii) {
max(u[matrix.indices[, ii]])
}))
}
makeTableGrobs <- function(e, ncol, nrow,
just = c("center", &qu...
2005 Nov 16
1
RODBC and Very long field lengths
...s = 74880 bytes) in
an MSAccess database.
It appears that RODBC set a maximum buffer size for a single column of
65535 bytes.
########## cut from RODBC.c ##########
} else { /* transfer as character */
int datalen = thisHandle->ColData[i].ColSize;
if (datalen <= 0 || datalen < COLMAX) datalen = COLMAX;
/* sanity check as the reports are sometimes unreliable */
if (datalen > 65535) datalen = 65535;
######################################
Can I increase this by just changeing the value in RODBC.c? If so how do
I get R to re-compile the package?
Thanks for your advi...
2013 Nov 21
2
overlaying 2D grid on randomly distributed points
Hi, I have a cloud of randomly distributed points in 2-dimensional space and want to set up a grid, with a given grid-cell size, that minimizes the distance between my points and the grid nodes. Does anyone know of an R function or toolbox that somehow addresses this problem? This is a problem of optimizing the location of the grid, not a problem of deciding what should be the grid-cell size,
2019 Jun 24
1
Calculation of e^{z^2/2} for a normal deviate z
...x))
l.off # NA || NaN or all lx == -Inf, or max(.) == Inf
else
stop("'l.off is infinite but not == max(.)")
} else if(rx == 2L) { ## matrix
if(any(x.off <- !is.finite(l.off))) {
if(mis.off || isTRUE(all.equal(l.off, apply(lx, 2L, max)))) {
## we know l.off = colMax(.)
if(all(x.off)) return(l.off)
r <- l.off
iok <- which(!x.off)
l.of <- l.off[iok]
r[iok] <- l.of + log(colSums(exp(lx[,iok,drop=FALSE] -
rep(l.of, each=d[1]))))
r
} else ## explicitly specified l.off differing from colMax(.)
stop("'l.off' has...
2008 Feb 10
2
View() + "End" key on Ubuntu=segfault
I can repeatably crash R (segfault)
by doing
n <- 10
z <- data.frame(a=1:n,b=1:n)
View(z)
and then hitting the "End" key on my keyboard.
I haven't got debugging going yet, but running under
gdb (without debugging symbols) does give this:
0xb7b63583 in strlen () from /lib/tls/i686/cmov/libc.so.6
R version 2.6.2 (2008-02-08)
i486-pc-linux-gnu
[Ubuntu Gutsy]
locale:
2019 Jun 24
2
Calculation of e^{z^2/2} for a normal deviate z
>>>>> William Dunlap via R-devel
>>>>> on Sun, 23 Jun 2019 10:34:47 -0700 writes:
>>>>> William Dunlap via R-devel
>>>>> on Sun, 23 Jun 2019 10:34:47 -0700 writes:
> include/Rmath.h declares a set of 'logspace' functions for use at the C
> level. I don't think there are core R functions that call