Even after fixing all other problems to make the code compile, it only works in VC2010 because it uses a non-standard extension. And If you specify /Wall to see all warnings, you compiler will emit warning C4213: nonstandard extension used : cast on l-value
Since the highest scoring answer states that the second method is better in every way, I feel compelled to post an answer here. True, looping by reference is more performant, but it isn’t without risks/pitfalls. Bottom line, as always: “Which is better X or Y”, the only real answers you can get are: It depends … Read more
Arrays are second-class citizens in C, they do not support assignment. char x[] = “This is initialization, not assignment, thus ok.”; This does not work: x = “Compilation-error here, tried to assign to an array.”; Use library-functions or manually copy every element for itself: #include <string.h> strcpy(x, “The library-solution to string-assignment.”);
You can do this by creating a list from the named vector of var.labels and assigning that to the label values. I’ve used match to ensure that values of var.labels are assigned to their corresponding column in data even if the order of var.labels is different from the order of the data columns. library(Hmisc) var.labels … Read more
There are several ways to introduce variables. DEFVAR and DEFPARAMETER introduce global dynamic variables. DEFVAR optionally sets it to some value, unless it is already defined. DEFPARAMETER sets it always to the provided value. SETQ does not introduce a variable. (defparameter *number-of-processes* 10) (defvar *world* (make-world)) ; the world is made only once. Notice that … Read more
Update of 2018-10-10: The most succinct way to carry out this specific task is to use list2env() like so: ## Create an example list of five data.frames df <- data.frame(x = rnorm(25), g = rep(factor(LETTERS[1:5]), 5)) LIST <- split(df, df$g) ## Assign them to the global environment list2env(LIST, envir = .GlobalEnv) ## Check that it … Read more
There is a great answer on the Struggling Through Problems Blog This is taken from there, with very minor modifications. USING THE FOLLOWING THREE FUNCTIONS (Plus one for allowing for lists of different sizes) # Generic form ‘%=%’ = function(l, r, …) UseMethod(‘%=%’) # Binary Operator ‘%=%.lbunch’ = function(l, r, …) { Envir = as.environment(-1) … Read more
(1) list[…]<- I had posted this over a decade ago on r-help. Since then it has been added to the gsubfn package. It does not require a special operator but does require that the left hand side be written using list[…] like this: library(gsubfn) # need 0.7-0 or later list[a, b] <- functionReturningTwoValues() If you … Read more
Use assign: assign(paste(“orca”, i, sep = “”), list_name[[i]])