names

This got me pretty bad. You can abbreviate list names? I never noticed it before and I got totally screwed for like a day. Can someone explain what is happening here and why it could be more useful than it is terrible? And why its inconsistent like that at the bottom? And if I can turn it off? > wtf <- list(whatisthe=1, pointofthis=2) > wtf$whatisthe [1] 1 > wtf$what [1] 1 > wtf <- list(whatisthe=1, whatisthepointofthis=2) > wtf$whatisthepointofthis [1] 2 > wtf$whatisthep [1] 2 > wtf$whatisthe [1] 1 > wtf$what NULL I suspect that partial matching by the $ operator was a nice(r) feature for

After cbind or rbind -ing a table object (for example, adding a margin of sums or somesuch), names of dimnames get lost (see y ). I found this "workaround" but was wondering if there's an out of the bag solution to this that looks less hacky. Perhaps something that can be done on the fly? I would like to keep the object of class table . > (x <- table(1:3, sample(1:3), dnn = c("rows", "cols"))) cols rows 1 2 3 1 1 0 0 2 0 0 1 3 0 1 0 > (y <- cbind(x, "4" = 4:6)) # "rows" and "cols" get lost 1 2 3 4 1 1 0 0 4 2 0 0 1 5 3 0 1 0 6 > names(dimnames(y)) <- names(dimnames(x)) > y cols rows 1 2 3 4 1

In R, when you coerce a vector from binary to numeric, the names are stripped away. There are a few possible solutions, which I've outlined before. It seems dangerous to rely on implicit conversion by adding 0 to all the values, and the sapply() adds an additional loop to my operations (which seems inefficient). Is there any other way to preserve the names when converting a vector using as.numeric ? # Set the seed set.seed(1045) # Create a small sample vector and give it names example_vec <- sample(x = c(TRUE,FALSE),size = 10,replace = TRUE) names(example_vec) <- sample(x = LETTERS,size = 10

I have a chunk of code which produces an error only the first time I run it. Strangely if I run it a second time I get no error (craziness definition?). Also the error does not show up always at the same position, I mean that if I add a few lines of comments the error message is printed after the comments and not after a specific instruction. I cannot provide a reproducible example because I do not know where exactly the error comes from. The error is the following: Error in names(frame)[names(frame) == "x"] <- name : names() applied to a non-vector I should specify that in my code I don't

In PHP one can use variable variables... For example... class obj { } $fieldName = "Surname"; $object = new obj(); $object->Name = "John"; $object->$fieldName = "Doe"; echo "{$object->Name} {$object->Surname}"; // This echoes "John Doe". However, $fieldName string may contain some characters not allowed in variable names. PHP will still create the field with that name (much like the associative array), but I will not be able to access it with $object->...... because it would not parse correctly. Now, is there any function that can check if the string can be used as a valid PHP variable name.