Displaying 20 results from an estimated 1000 matches similar to: "write to M, using row and columns taken from A and B, with values from C"
2012 Apr 27
6
Min , Max
Hellow everyone,
This code bellow will calculate average daily wind speed(measurements are
taken every three hours).Any ideas how to take the Min and Max instead of
average.
library(Matrix)
setwd("C:\\Users\\aalyaari\\Desktop\\img")
listfile<-dir()
long <- file("C:\\Users\\aalyaari\\Desktop\\New folder (5)\\inra.bin", "rb")
A=readBin(long, integer(),
2012 May 24
6
R does not recognise columns and rows as they are supposed to be
Dear All,
The code given bellow is to extract values of one region and write that to
a text file(there are 365 binary files in the directory).
The problem which I am facing is that all my files are binary with size of
360 rows and 720 columns.
I specified that in this line: file2<-matrix(data=file,ncol=720,nrow=360)
but I got an error : Error in mean(file2[X, Y], na.rm = TRUE) : subscript
2012 May 28
1
Why R order files as 1 10 100 not 1 2 3 ?
The code given below worked well. However, the problem is that when I typed
dir1 to see the results I found that R order the files as:
[1] "data1.flt" "data10.flt" "data100.flt" "data101.flt"
[5] "data102.flt" "data103.flt" "data104.flt" "data105.flt"
[9] "data106.flt" "data107.flt"
2012 Dec 03
4
How to calculate the spatial correlation of several files?
dir1 <- list.files("C:\\Users\\aalyaari\\Desktop\\cor", "*.bin",
full.names = TRUE)
dir2 <- list.files("C:\\Users\\aalyaari\\Desktop\\cor2", "*.bin",
full.names = TRUE)
results <- list()
for (.files in dir1){ # read in the 365 files as a vector of
numbers for dir1
file1 <- do.call(rbind,(lapply(.files, readBin ,
2012 Apr 25
0
locate values to their positions based on their pixel and line in other files
I have 3 files A ,B ,C as binary files. C represents the values of tepm
measured every 3 hours for one month so it has 674200 columns and 248
rows.values of A represent the correspond lines(these values could be within
1to360) and , while values of B represent the correspond pixel(1to720) for
each point in file C(so both they have 1 row and 67420rows).Now I will
create a new matrix ,M ,which has
2013 Jan 17
2
How to calculate monthly average from daily files in R?
I have 365 binary files:
https://echange-fichiers.inra.fr/get?k=oy3CN1yV1Um7ouRWm2U ,I want to
calculate the monthly average. So from the 365 files, I will get 12 files.I
would like also to tell R not to take into account the no-data value
(-32765).for example, for the first month, there are 31 records: 3 of these
records has the value -32765,I want R to take the average of the rest
records(28
2013 Jan 14
4
How to open grib file in R?
I have this https://echange-fichiers.inra.fr/get?k=6TdTdezNeZwAqJtpwVm
grib file which is a regular lat-lon 0.25x0.25 degrees and contains 4 fields
.
I tried to open it using :
grib <-
readGDAL("C:\\Users\\aalyaari\\Desktop\\Vol_025_H14_2010060700.grib")
but I got this error:
C:\Users\aalyaari\Desktop\Vol_025_H14_2010060700.grib has GDAL driver GRIB
and has 721 rows and
2009 May 18
2
readBin on binary non-blocking connections (Windows & Unix differences/bugs)
R-devel:
I am encountering a consistency issue using socketConnection and
readBin with *non-blocking* connections on Unix and Windows XP (no
Vista to test).
I am a bit confused by the behavior of *non-blocking* connections
under Windows specifically. When calling readBin on a non-blocking
connection when there is no data to read on the socket, the connection
under Unix will return a vector of
2006 Jun 28
2
read file with readBin (the file was saved with a C-routine)
Hello!
I have problems with using of "readBin" to read files, which was written in C with "fwrite". In the C-File there is the following Code:
fwrite(MyitINI,sizeof(itINItype),1,outfile);
where MyitINI is a structure of the following form
typedef struct{
int KernelFileSave; /* Determined, if Systemmatrix saved or not.*/
char KernelFileName[200]; /* A-Matrix name
2004 Jun 01
2
Importing binary data
Hi everybody!
I've a large dataset, about 2 Mio entries of the format which I would like
to import into a frame:
<integer><integer><float><string><float><string><string>
Because to the huge data amount I've choosen a binary format instead
of a text format when exporting from Matlab.
My import function is attached below. It works fine for only
2003 Feb 13
5
ESRI shape file import and time-space models
Dear R user,
I am running R under Windows 2000.
I am looking for a routine for importing
- shape files (ESRI) into R
- dbase files (FOXPRO) into R
and I am looking for time-space models for description and prediction of
Bernoulli-, Binomial- and Poissonvaraibles.
Thank's a lot for a reply.
Sincerely yours,
Ekkehardt Altpeter
Swiss Federal Office of Public
2019 Nov 18
2
readBin should check that its endian argument is a legal value
I think it would be helpful if readBin checked that its endian argument is
a legal value.
Why? I was reviewing some of our code and noticed that the author had
readBin(..., endian="network") and never having heard of "network", I
looked at the man page for readBin, and it hadn't heard of "network"
either. Not good.
I then looked at the R code for readBin, which
2012 May 03
2
Help with readBin
I'm trying to read a binary file created by a fortran code using readBin
and readChar. Everything reads fine (integers and strings) except for
double precision numbers, they are read as huge or very small number
(1E-250,...). I tried various endianness, swap, But nothing has worked so
far.
I also tried on R 64 bit for linux and windows (R 2.14) and R 2.11 on
windows XP 32 bit.
Any help would
2002 Mar 05
3
reading 2-byte integers using readBin and connections
Hi folks:
This may be a stupid question, but I cannot seem to find a way to tell
readBin that I want to read 2-byte integers from the connection. The input
file is 150,720 bytes long containing 75,360 short (2-byte) integers. But
specifying "integer" or "int" for what in readBin only returns me a vector
of length 37680, leading me to believe that sizeof(integer) or
2006 Sep 27
2
Single Precision (4 byte) floats with readBin
I would like to use readBin to read a binary data
file. Most of the data is 4-byte floating point but,
for some reason, only double precision appears to be
offered. I tried
fVariable=readBin(iFile,what=single());
and got 35.87879 which looks believable except that
the correct value is 3.030303. I then tried
fVariable=readBin(iFile,what=single(),4);
and got
[1] 3.831111e+10 6.657199e+10
2011 Sep 01
4
readBin fails to read large files
Posting for a friend
Begin forwarded message:
From: "Geier, Florian" <florian.geier08@imperial.ac.uk<mailto:florian.geier08@imperial.ac.uk>>
Subject: Fwd: readBin fails to read large files
Date: September 1, 2011 4:10:53 PM GMT+01:00
To:
Begin forwarded message:
Date: 1 September 2011 16:01:45 GMT+01:00
Subject: readBin fails to read large files
Dear all,
I am trying
2002 Apr 26
4
Memory "leak" in readChar (PR#1483)
Full_Name: Hugh C. Pumphrey
Version: 1.4.1
OS: Linux (Debian Woody)
Submission from: (NULL) (129.215.133.170)
The function readChar() appears to have some type of problem with memory
allocation.
I don't know if "memory leak" is the correct term but if one uses readChar()
many
times, the R binary grows in size until it eats all your memory and swap space.
The code enclosed below
2011 Mar 29
2
Reading 64-bit integers
Dear all,
I see from some previous threads that support for 64-bit integers in R
may be an aim for future versions, but in the meantime I'm wondering
whether it is possible to read in integers of greater than 32 bits at
all. Judging from ?readBin, it should be possible to read 8-byte
integers to some degree, but it is clearly limited in practice by R's
internally 32-bit integer type:
2007 Jan 26
1
readBin is much slower for raw input than for a file
Dear all,
I'm trying to write an efficient binary file reader for a file type
that is made up of several fields of variable length, and so requires
many small reads. Doing this on the file directly using a sequence of
readBin() calls is a bit too slow for my needs, so I tried buffering
the file into a raw vector and reading from that ("loc" is the
equivalent of the file pointer):
2007 Jan 26
1
readBin is much slower for raw input than for a file
Dear all,
I'm trying to write an efficient binary file reader for a file type
that is made up of several fields of variable length, and so requires
many small reads. Doing this on the file directly using a sequence of
readBin() calls is a bit too slow for my needs, so I tried buffering
the file into a raw vector and reading from that ("loc" is the
equivalent of the file pointer):