[R] openNLP package
Hi all, Can anyone please help me in using the openNLP package for doing named- entity extraction? Regards, Som __ 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.
Re: [R] How to fit a random data into Beta distribution?
Hi, @Steven: Since Beta distribution is a generic distribution by which i mean that by varying the parameter of alpha and beta we can fit any distribution. So to check this i generated a random data from Normal distribution like x.norm-rnorm(n=100,mean=10,sd=10); Now i want to estimate the paramters alpha and beta of the beta distribution which will fit the above generated random data. That's what i want to do. @Ali: When you said you drafted your own procedure, do you mean that you are calculate the parameters using MLE or bayesian..???Can you please give me some more ideas into this? Thanks and Regards, Som Shekhar __ 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.
Re: [R] Remove all whitespaces
A more elegant way would be: myString-1 2 3 4 5 myString-paste(unlist(strsplit(myString, )),collapse=) The output will be 12345 Regards, Som Shekhar __ 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.
Re: [R] Using functions/loops for repetitive commands
Hi Derek,
You can accomplish your loop jobs by following means:
(a) use for loop
(b) use while loop
(c) use lapply, tapply, or sapply. (i feel lapply is the elegant
way )
---For Loop-
for loops are pretty simple to use and is almost similar to any
other scripting languages you know.( I am referring to Matlab)
(Example 1) lets say you know that you have to run 10 iterations then
you can run it as
for(i in 1:10) print(i)
//it will print the number from 1 to 10
(Example 2) You don't know how many iterations you need to run. Only
thing you have is some vector and you want to do some operation on
that vector. You can do something like this:
myVector-c(20,45,23,45,89)
for(i in seq_along(myVector)) print(myVector[i]
-Using lapply-
In lapply you need to provide mainly two things:
(1)First parameter: vectors or some sequence of numbers
(2)Second parameter: A function which could be user defined function
or some other inbuilt function.
lapply will call the function for every number given in the First
parameter of the function)
For example:
x-c(10,20,20)
lapply(seq_along(x),function(i) {//your logic})
if you see the first parameter i have sent seq_along(x). The outcome
of seq_along(x) will be 1, 2,3.
Now lapply will take each of these numbers and call the function. That
means lapply is calling the function thrice for the current data set
something like this
function(1) { //your logic}
function(2) { }
function(3) { //)
That means your logic inside the function will be executed for each
and every value specified in the first parameter of the lapply
function.
I hope it helps you in some way.
For your problem, i am making a guess that you are using data frame or
matrix to store the data and then you want to automate the data right?
You can try using lapply, i think that would be efficient..Let me
also try ..
Regards,
Som Shekhar
__
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] How to fit a random data into Beta distribution?
Hi Steven, Thanks for the quick reply. i have tried but its giving me error---Error in optim(x = c(38.1815173696765, -12.7988197976440, -3.88212459045077, : initial value in 'vmmin' is not finite i have tried something like this: library(MASS) x-rnorm(n=100,mean=10,sd=20); fitdistr(x,dbeta,start=list(shape1=1,shape2=1) Please correct me if my understanding is wrong: In the fitdistr fucntion we are providing the initial values of the Beta distribution parameters as shape1=1 and shape2=1. This function will try to fit the data and give us the new parameters of Beta distribution that approximately fits this data. I have tried the function with other distribution like Normal, Gamma, Weibull...its working fine.. Regards, Som Shekhar On May 4, 1:25 am, Steven Kennedy stevenkennedy2...@gmail.com wrote: library(MASS) fitdistr(x,beta,list(shape1=1,shape2=1)) On Tue, May 3, 2011 at 9:44 PM, Shekhar shekhar2...@gmail.com wrote: Hi, I have some random data and i want to find out the parameters of Beta distribution ( a and b) such that this data approximately fits into this distribution. I have tried by plot the histograms and graph, but it requires lot of tuning and i am unable to do that. can anyone tell me how to do it programmitically in R? Regards, Som Shekhar __ r-h...@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ r-h...@r-project.org mailing listhttps://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ 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.
[R] How to fit a random data into Beta distribution?
Hi, I have some random data and i want to find out the parameters of Beta distribution ( a and b) such that this data approximately fits into this distribution. I have tried by plot the histograms and graph, but it requires lot of tuning and i am unable to do that. can anyone tell me how to do it programmitically in R? Regards, Som Shekhar __ 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.
Re: [R] Using Java methods in R
Hi Hill, I just finished interfacing the C++ with R, i.e. c++ functions from R and vice versa. Next thing in pipe line is Java and python. I just wanted to share some of the things which i think might be useful for you. Reason being whether its a C++, java or any other compiled language the interface has to be generic in R. That means mode of interfacing might be different(using different packages Rcpp for c++, rJava for Java) but the underlying mechanism remains the same. For C++ you will be creating a dll ( windows) and .so( *nix) and for jave you will be using class. Now for using c++/java functions with in R or vice versa, you first should check whether the functions are properly loaded in the R symbol table or not? If you are unable to call the java functions in R, then probably you are unable to load the class into the R environment. A few steps which i have followed in C++ ( i think must be more or less same conceptually) could be useful for you: 1) I have a c++ file, i compile it using the command R CMD SHLIB filename.cpp. On successful completion it creates the library. if you are getting compilation error then you need to check whether the header files are in proper path or not. 2) Then for using this function is first use to load the library using the function dyn.load(library path) 3) If the loading is successful i check whether the required function is properly loaded into the R symbol table or not by using the function is.loaded(function name) 4) if it returns true, then i call the function by using .C or .Call function provided by R. For more information you can see http://groups.google.com/group/brumail/browse_thread/thread/a278dcbb6a8a439a . Hope it helps you in someway. Regards, Som Shekhar __ 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.
