The def declares a method within a surrounding object/class/trait, similar to the way you define methods in Java. You can only use defs within other objects/classes/traits. In the REPL, you cannot see the surrounding object because it’s “hidden”, but it does exist. You cannot assign a def to a value, because the def is not … Read more
Matlab expects functions to be in their own file. Copy the above code to a file ‘stat.m’ and it should work. This policy does cause an unnecessary number of short files, but it is required because of the way matlab handles variable scope. Each file gets its own scope, and all variables in the command … Read more
This is F#’s embarrassing skeleton in the closet. Try this: > let mapPair f (x,y) = (f x, f y) val mapPair : f:(‘a -> ‘b) -> x:’a * y:’a -> ‘b * ‘b Fully generic! Clearly, function application and tuples work. Now try this: > let makeList a b = [a;b] val makeList : … Read more
I’d use lsf.str() as a start. eg : x <- as.character(lsf.str(“package:base”)) gives you a list of all functions in the base package. You could do add all packages you want to check against. stats and utils come to mind first. EDIT : Regarding your question about currently loaded packages : x <- unlist(sapply(search()[-1],function(x)as.character(lsf.str(x)))) see comments … Read more
To return a value from a VBScript function, assign the value to the name of the function, like this: Function getNumber getNumber = “423” End Function
I’m also new to d3 and was struggling with the key function. I didn’t find Tristan Reid’s answer illuminating, because it doesn’t really talk much about the key function. Let’s work through an example, first without a key function, and then with. Here’s our initial html before applying javascript. We’ve got two divs, and there … Read more
The export -f feature is specific to Bash: parent #!/bin/bash plus1 () { echo $(($1 + 1)); } echo $(plus1 8) export -f plus1 ./child 14 21 child #!/bin/bash echo $(plus1 $(($1 * $2)) )
It’s useful as an argument to higher order functions (functions which take functions as arguments), where you want some particular value left unchanged. Example 1: Leave a value alone if it is in a Just, otherwise, return a default of 7. Prelude Data.Maybe> :t maybe maybe :: b -> (a -> b) -> Maybe a … Read more
Here is a list of red-flags (in no particular order) that could indicate that a function is too long: Deeply nested control structures: e.g. for-loops 3 levels deep or even just 2 levels deep with nested if-statements that have complex conditions. Too many state-defining parameters: By state-defining parameter, I mean a function parameter that guarantees … Read more
Identifier expected Your code would be correct in a Pascal, but it does not compile in Pascal Script. In Pascal, when you want to assign a return value of a function, you either assign the value to a “variable” with a name of the function or to Result variable. So this is correct: function GetRoot: … Read more