assign

Possible Duplicate: Javascript syntax: what comma means? I came across the code while reading this article (do a Ctrl + F search for Andre Breton ): //function returning array of `umbrella` fibonacci numbers function Colette(umbrella) { var staircase = 0, galleons = 0, brigantines = 1, armada = [galleons, brigantines], bassoon; Array.prototype.embrace = [].push; while(2 + staircase++ < umbrella) { bassoon = galleons + brigantines; armada.embrace(brigantines = (galleons = brigantines, bassoon)); } return armada; } What does the x = (y = x, z) construct mean? Or more specifically, what does the

I am trying to assign data to an existing dataframe with a name generated in a loop. A basic example might be A = data.frame(a = c(1,2,3), b=c(3,6,2)) for (i in 1:2){ name = paste("Name",i, sep="") assign(name, c(6,3,2)) } Now I just need to figure out how to add name1 and name2 to the data.frame A, while keeping their assigned name. I'm sure there is an easy answer, I'm just not seeing it right now. in the end I would like to end up with A #a b name1 name2 #1 3 6 6 #2 6 3 3 #3 2 2 2 But I need to do this in an automated fashion. For instance if the for loop could be adapted to be like for (i

I recently discovered pandas "assign" method which I find very elegant. My issue is that the name of the new column is assigned as keyword, so it cannot have spaces or dashes in it. df = DataFrame({'A': range(1, 11), 'B': np.random.randn(10)}) df.assign(ln_A = lambda x: np.log(x.A)) A B ln_A 0 1 0.426905 0.000000 1 2 -0.780949 0.693147 2 3 -0.418711 1.098612 3 4 -0.269708 1.386294 4 5 -0.274002 1.609438 5 6 -0.500792 1.791759 6 7 1.649697 1.945910 7 8 -1.495604 2.079442 8 9 0.549296 2.197225 9 10 -0.758542 2.302585 but what if I want to name the new column "ln(A)" for example? E.g. df.assign

Having a vector of vector with a fixed size, vector<vector<int> > v(10); I would like to initialize it so that it has in all elements a one dimensional vector with initialized value (for example 1). I have used Boost Assign as follows v= repeat(10,list_of(list_of(1))); and I've got a compilation error error: no matching function for call to ‘repeat(boost::assign_detail::generic_list<int>)’ Could you please tell me how to do that. Thanks in advance This doesn't use boost::assign but does what you need: vector<vector<int>> v(10, vector<int>(10,1)); This creates a vector containing 10 vectors of

For iOS developers, delegates are used almost everywhere. And seems like that we need to use "assign" instead of retain for a delegate like this @property(assign) id delegate; The reason is to avoid the circular loop issue Why are Objective-C delegates usually given the property assign instead of retain? I saw a lot of code and they still used "retain". So the question here is will we still get the circular loop issue if we use retain for a delegate? Thanks vfn The documentation says: Retaining an object creates a strong reference, and an object cannot be deallocated until all of its strong

Update 2 @G. Grothendieck posted two approaches. The second one is changing the function environment inside a function. This solves my problem of too many coding replicates. I am not sure if this is a good method to pass through the CRAN check when making my scripts into a package. I will update again when I have some conclusions. Update I am trying to pass a lot of input argument variables to f2 and do not want to index every variable inside the function as env$c, env$d, env$calls , that is why I tried to use with in f5 and f6 (a modified f2 ). However, assign does not work with with inside