[R] controlling the number of times a script is repeated in a loop
I am running a large for loop and at the end of each iteration a matrix is produced. The program changes the columns in the matrix, and each time a column is added the name of that column is y. All original columns have no column name. Due to the nature of the program, all original columns will eventually be replaced with new columns each with the column name y. It is at this point that I want the program to stop running the for loop (right now I just have it running for 20 iterations resulting in a matrix with a mix of old and new columns). I was thinking maybe I could do something with an if else statement and the command colnames. For example: If(colnames all are y) (stop) else (run the program again) Not entirely sure how to go about this though, or if I am even on the right track. Maybe I need to get rid of the master for loop as perhaps for loops are more constraining in the number of times the program is run? The number of runs to get all original columns replaced with new ones will never be the same (I plan on running this several times, with time steps ending when all original columns are replaced. Perhaps at the end of each time step I can set column names to have no column names (so from ys to nothing), allowing me to use this method for each time step)... I know it is always helpful to have some code to work with, but it seems impractical to send the whole program as one part if it I am still working on and would probably just create more confusion. Hopefully someone might be able to offer a few suggestions...I can try to come up with a toy program to send along but I am not good enough in R yet to do this quickly! Thank you for all the help and I am sorry if this question is perhaps a bit confusing! If I have not made my problem and what I hope to do clear, please let me know. __ 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] if then statement problem
I really need help with an if then statement I am having trouble with. A brief
explanation of what I am trying to do: I have a p matrix of all permutations of
a vector of length 3 filled with either 1s or -1s (these make up the columns).
The p.unique matrix is the unique columns of the p matrix; here, they are
identical but in my real script this will not always be the case. I want to be
able to take a randomly generated vector and see which column in the p.unique
matrix, if any, match the random vector. If there is a match, I get an integer
returned that tells me which column is the match. If there is no match, I get
the response integer (0). I want to write an if then statement that allows me
to do different things based upon if there is a match to one of the columns in
the p.unique matrix or not. Below is a sample script plucked from bits of my
master script that show this problem. The vector r was made to not match
any columns in p.unique. If it did, c wou!
ld equal the integer representing the matching column, and since it does not,
I want c to equal the vector (0,0,0). My if then statement is not working (I
keep getting the error that my argument is of length zero), so I would really
appreciate any help anyone can provide me. Thanks for all of your help
previously and in advance for the help with this problem!! Happy Thanksgiving!
p=as.matrix(do.call(expand.grid,rep(list(c(-1,1)),3)))
p=t(p)
p.unique=unique(p,MARGIN=2)
r=c(2,2,2)
q=which(apply(p.unique,2,function(x)all(x==r)))
if(q0){c=p.unique[,q]};{c=c(0,0,0)}
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and provide commented, minimal, self-contained, reproducible code.
[R] matching matrix columns to a vector
I need help with (hopefully) just one more thing. I have been fussing with this for quite some time and have decided just to give up and ask! I want to match a column in a matrix to a vector. I found a which command that I thought would be helpful as it does the following: g=c(1,5,3,2,7) which(g==5) [1] 2 As the above gave which placement in the g vector corresponded to 5 (the second place), I need this command to give me which column in a matrix matches to a vector. This is just a toy example of what I am trying to do: t=matrix(1:12,3,4) v=c(1,2,3) which(t[,j]==v) This does not work, and with my real matrices and vectors, I was getting outputs that did not make sense. These examples are more to give an idea of what I am aiming to accomplish. Thank you for all the help!! __ 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] unique columns in a matrix and number of each
I need help determining the unique columns of a matrix and the numbers of each unique column. For example, let's say I have a matrix with 6 columns, 2 of these are filled with the value of 1 and the other 4 are filled with the value of 0. I would then like to have a command that tells me what the unique columns are (so columns with 1s and columns with 0s) and the number of each type of column (so 2 columns of 1s and 4 columns of 0s) that occur in the matrix. Thank you for any help anyone can provide!! I have been very impressed with the help that I have received so far!! Thank you! __ 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] (no subject)
I need help with another problem I am having that deals with the generation of vectors that I asked about yesterday. I now need to have each value in the vector (all values either 1 or -1) have a probability p that it will switch signs (so, say, each value has a 50% chance of switching from -1 to 1 or visa versa). What would be the best way to go about doing this? Thank-you!! __ 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] random value changes in a vector
To clear up a question regarding my earlier posting regarding random changes in a vector: Say you have a vector (1, -1, -1, 1, 1, -1). I want each value in the vector to have a probability that it will change signs when this vector is regenerated. For example, probability = 50%. When the vector is regenerated, the first value in the vector (1) has a 50% chance of switching to -1. If I regenerated this vector 10 times, 5 of the times it would switch to -1. Similarly, I need each value in the vector to have this same probability of switching signs when the vector is regenerated, and each value's chances of doing so is independent of the other values. So the second value (-1) also has a 50% chance of switching to 1, and whether or not it does so is independent of if the first value changes from 1 to -1 (also a 50% probability). I hope this clears up the confusion, and I would appreciate any help anyone can provide! __ 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] (no subject)
I need help generating all possible combination of a vector of randomly assigned values of 1 and -1. For example, a vector of 20 randomly placed 1s and -1s, and all possibilities (which would amount to 2^20 total vectors). I am able to generate one such vector (via sample(c(-1,1),20,replace=TRUE)), but I do not know how to generate all the possibilities, which would need to be placed in a matrix. Any help would be greatly appreciated!!! __ 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.
