Displaying 9 results from an estimated 9 matches for "vectorwise".
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vectorise
2009 Nov 29
3
How to z-standardize for subgroups?
...rs$var1, group, z.mean.sd)
which gives me the standardised data for each subgroup in a list with
the subgroups
z.var1 <- unlist(z.var1)
then gives me the z-standardised data for var1 in one vector. Great!
Now I would like to do this for the whole dataframe, but probably I am
not thinking vectorwise enough.
z.df.vars <- by(df.vars, group, z.mean.sd)
does not work. I banged my head on other solutions trying out sapply
and tapply, but did not succeed. Do I need to loop and put everything
together by hand? But I want to keep the columnnames in the vector?
-karsten
--------------------...
2012 Oct 30
2
Java Exception error while reading large data in R from DB using RJDBC.
Dear List,
Java Exception error while reading large data in R from DB using RJDBC.
I am trying to read large data from DB table(Vectorwise), using RJDBC
connection.
I have tested the connection with small size data and was able to fetch DB
tables using same connection(conn as in my code).
Please suggest where am i going wrong or alternate option to solve such
issues while reading large DB table.
drv <- JDBC(paste(db_driver,...
2011 Oct 18
1
Function in nested loop
Hi all,
I would like to run a function with several nested conditions, which are
completely factorial.
The input data (x1) has two different sample sizes, so:
x1 <- dat1
x1 <- dat2
Then a can have 3 different values:
a <- 0.15
a <- 0.35
a <- 0.50
Then b can have 2 different values:
b <- data.matrix (c(0.5,0.5,0.5))
b <- data.matrix (c(0.2,0.4,0.6))
Then d can have 5
2007 Dec 06
1
Integral implicit function
Hi,
Could somebody help me with the following. I want to calculate the integral over an implicit function. I thought to integrate over a function depending on uniroot. In previous topics I found a thread about finding the root of an integral. And that works. But the other way around, does not work. Does R support this?
I included the following example. The function in the example is very easy
2010 Nov 23
2
[LLVMdev] Unrolling power sum calculations into constant time expressions
Hello,
I noticed that feeding 'clang -O3' with functions like:
int sum1(int x) {
int ret = 0;
for(int i = 0; i < x; i++)
ret += i;
return ret;
}
int sum2(int x) {
int ret = 0;
for(int i = 0; i < x; i++)
ret += i*i;
return ret;
}
...
int sum20(int x) {
int ret = 0;
for(int i = 0; i < x; i++)
ret +=
2011 Oct 04
1
a question about sort and BH
Hi,
I have two questions want to ask.
1. If I have a matrix like this, and I want to figure out the rows whose
value in the 3rd column are less than 0.05. How can I do it with R.
hsa-let-7a--MBTD1 0.528239197 2.41E-05
hsa-let-7a--APOBEC1 0.507869409 5.51E-05
hsa-let-7a--PAPOLA 0.470451884 0.000221774
hsa-let-7a--NF2 0.469280186 0.000231065
hsa-let-7a--SLC17A5
2011 Jul 31
4
help with algorithm
I'm wondering if anyone can give some basic advice about how to approach a
specific task in R.
I'm new to R but have used SAS for many years, and while I can muscle
through a lot of the code details, I'm unsure of a few things.
Specific questions:
If I have to perform a set of actions on a group of files, should I use a
loop (I feel like I've heard people say to avoid looping
2010 Nov 23
2
[LLVMdev] Unrolling an arithmetic expression inside a loop
Hello,
I've been redirected from cfe-dev, as code optimizations in clang are
done in llvm layer.
I'm investigating how optimized code clang generates, and have come
across such an example:
I have two procedures:
void exec0(const int *X, const int *Y, int *res, const int N) {
int t1[N],t2[N],t3[N],t4[N],t5[N],t6[N];
for(int i = 0; i < N; i++) {
t1[i] = X[i]+Y[i];
2010 Nov 23
1
[LLVMdev] Unrolling loops into constant-time expressions
Hello,
I've come across another example:
I'm compiling with
clang -S -emit-llvm -std=gnu99 -O3
clang version 2.9 (trunk 118238)
Target: x86_64-unknown-linux-gnu
Thread model: posix
I take the code:
int loops(int x) {
int ret = 0;
for(int i = 0; i < x; i++) {
for(int j = 0; j < x; j++) {
ret += 1;
}
}
return ret;
}
and the