I am trying to load the data from the National Address Database provided by
Transportation.gov into R. The data can be downloaded by anyone after accepting the disclaimer at this link: https://www.transportation.gov/gis/nad/disclaimer
I download the data, unzipped it into a directory I called data and then tried to use rgdal to list all the layers present in the data via:
fc_list<- rgdal::ogrListLayers("./data/NAD_20180215.gdb").
However, I cannot get rgdal to return anything other than an error saying "Cannot Open Data Source"....
I am wondering how I would go about listing the layers present in the .gdb folder as well as reading them into R?
I'm very grateful for any help. Thank you in advance.
-nate
Following the suggestion here, using a full path to the gdb folder helped in my case.
# check for package and install if needed
if(!require(rgdal)){
install.packages("rgdal", dep=T)
library(rgdal)
}
# full path to the geodatabase required
fgdb <- "C:/full/path/to/the/geodatabase.gdb"
# list all feature classes in a file geodatabase
subset(ogrDrivers(), grepl("GDB", name))
ogrListLayers(fgdb)
paths in mac are written differently.
https://rpubs.com/bpattiz/Directories_Paths_Workspaces
And especially:
https://derekyves.github.io/2016/05/10/codeshare.html
First you need to set your working directory.
And then probably:
fc_list<- rgdal::ogrListLayers("/data/NAD_20180215.gdb")
or
fc_list<- rgdal::ogrListLayers("~/data/NAD_20180215.gdb")
will work
I created some functions and try to build a package/library, but run into some problems. I hoped to get some advise here on this support site.
This is how I tried to built my package.
I had some functions in an R file, including roxygen2 comments.
Then in R
library("devtools")
library(roxygen2)
setwd("C:to/my/directory")
create("myPackage")
Then I put my functions file in the R folder and changed the DESCRIPTION file.
setwd("./myPackage")
document()
setwd("..")
install("myPackage")
library(myPackage)
Then, when I want to see how a function works
?function1
I see the documentation in my browser.
But when I want to use my function I get an error.
function1
Error: object 'function1' not found
function1()
Error: could not find function "function1"
Does anyone know what I am doing wrong? I am using R 3.3.1 on Windows 7.
Your help or comments are appreciated, thanks in advance!
Ben
library(utils)
a<-zip.file.extract("\\1\\1.csv",zipname="drivers.zip")
Error: could not find function "zip.file.extract"
What's going on?
zip.file.extract() is a defunct function as of R 2.14 (see ?"utils-defunct" help page or try brining up the ?zip.file.extract help page). Use the unzip() function instead. Perhaps
unzip("drivers.zip", files="\1\1.csv")
or you can omit the files= to extract all files in the zip archive to the current working directory.
Good moorning
I would like to know if there is a way to find where a package is installed.
Actually, I am currently documenting a package. In my package, I have a function called "read.myfile" which reads a specific kind of file (roughly like read.table).
I have an instance of this kind of file named "myfile.txt" in my package's folder. On my documentation, I want to run an executable example of this function.
That's why I need the path, where the user has installed the package. So with this path, I can obtain the path of the file "myfile.txt" and use the function "read.myfile" in the .Rd help file, which gives help about the function "read.myfile".
Thus my example will be executable wherever the user has installed the package.
I hope my message was clear.
I don't know if it's possible to do that, but if anyone knows, thanks for helping me.
Use the function system.file.
For example:
system.file(package="ggplot2")
[1] "C:/Users/Andrie/Documents/R/win-library/3.0/ggplot2"
You can use installed.packages and subset to get the only the location of the library in which it is installed:
installed.packages()["tools","LibPath"]
[1] "C:/Program Files/R/R-2.15.2/library"
I want to find the location of the script .R files which are used for computation in R.
I know that by typing the object function, I will get the code which is running and then I can copy and edit and save it as a new script file and use that.
The reason for asking to find the foo.R file is
Curiosity
Know what is the algorithm used in the numerical computations
More immedietly, the function from stats package I am using, is running results for two of the arguments and not the others and have to figure out how to make it work.
Error shown by R implies that there might be some modification required in the script file.
I am looking for a more general answer, if its possible.
Edit: As per the comments so far, here is the code to compute spectrum of a time series using autoregressive methods. The data input is a univariate series.
x = ts(data)
spec.ar(x, method = "yule-walker") 1
spec.ar(x, method = "burg") 2
command 1 is running ok.
command 2 gives the following error.
Error in ar.burg.default(x, aic = aic, order.max = order.max, na.action = na.action, :
Burg's algorithm only implemented for univariate series
I did try specify all the arguments correctly like na.action=na.fail, order.max = NULL etc but the message is the same.
Kindly suggest possible solutions.
P.S. (This question is posted after searching the library folder where R is installed and zip files which come with packages, manuals, and opening .rdb, .rdx files)
See FAQ 7.40 How do I access the source code for a function?
In most cases, typing the name of the function will print its source
code. However, code is sometimes hidden in a namespace, or compiled.
For a complete overview on how to access source code, see Uwe Ligges
(2006), “Help Desk: Accessing the sources”, R News, 6/4, 43–45
(http://cran.r-project.org/doc/Rnews/Rnews_2006-4.pdf).
When R installs a package, it evaluates all the ".R" source files and re-saves them into a binary format for faster loading. Therefore you typically cannot easily find the source file.
As has been suggested elsewhere, you can simply type the function name and see the source code, or download the source package and find the source there.
library(plyr)
ddply # prints the source for ddply
# See the content of the R directory for plyr,
# but it's only binary files:
dir(file.path(find.package("plyr"), "R"))
# [1] "plyr" "plyr.rdb" "plyr.rdx"
# Get the source for the package:
download.packages("plyr", "~", type="source")
# ...then unpack and inspect the R directory...
.libPaths() should tell you all of your current library locations. It's possible to have more than one installation of a package if there are two libraries but only the one that is in the first library will be used. Unless you offer the code and the exact error message, it's not likely that anyone will be able to offer better advice.
I think you are asking to see what I call the source code for a function in a package. If so, the way I do it is as follows, which has worked successfully for me on the three times I have tried. I keep these instructions handy in a few places and just copied and pasted them here:
To see the source code for a function in Program R download the package containing the function. Specifically, download the file that ends in "tar.gz". This is a compressed file. Expand the compressed file using, for example, "WinZip". Now you need to open the uncompressed file that ends in ".tar". Download the free software "7-Zip". Click on the file "7zFM.exe" and navigate to the directory containing the ".tar" file. You can extract the contents of that ".tar" file into a new folder. The contents consist of R files showing the source code for the functions in the R package.
EDIT:
Today (July 8, 2012) I was able to open the 'tar.gz' file using the latest version of 'WinZIP' and could copy the contents (the source code) from there without having to use '7-Zip'.
EDIT:
Today (January 19, 2013) I viewed the source code for functions in base R by downloading the file
'R-2.15.2.tar.gz'
To download that file go to the http://cran.at.r-project.org/ webpage and click on that file in this line:
"The latest release (2012-10-26, Trick or Treat): R-2.15.2.tar.gz, read what's new in the latest version."
Unzip the file. WinZip will work, or it did for me. Then search your computer for readtable.r or another base R function.
agstudy noted here https://stackoverflow.com/questions/14417214/source-file-for-r-function that source code for read.csv is located in the file readtable.r, so do not expect every base R function to have its own file.