combinations

问题 This question already has answers here : All combinations of all sizes? (2 answers) Unordered combinations in R (2 answers) Closed last year . I would like to build a dataframe that lists all possible combinations of 6 numbers. I realised that I can use combn(), but with only one value for m. With a bit of playing around I got the desired result by going through step-by-step with the following code - combi1 <- data.frame(c(1:6)) colnames(combi1) <- 'X1' combi2 <- data.frame(t(combn(c(1:6), 2)

问题 I'm testing Lexibar software for voice synthesis in our schoolboard. This kind of software is design to help students who have learning difficulty so I need to write a VBS file that simulate the Ctrl + Alt + A . I tried : wshshell.sendkeys "^%{a}" "^%a" "^%{A}" "^%A" "^(%a)" "^(%(a))" ... (But nothing worked) If I try wshshell.sendkeys "^%{down}" -> the screen rotate but I am not able to send Ctrl + Alt + A . Is it blocked ( Ctrl + Alt + Del is blocked). 回答1: You should use it like ^%{a} .

问题 I am trying to generate a column "Gender Combinations" that creates exhaustive categories of interaction terms like in the table below. Is there an easy way to do this in R? +--------------+--------------+--------------+---------------------+ | EMP 1 Gender | EMP 2 Gender | Emp 3 Gender | Gender Combinations | +--------------+--------------+--------------+---------------------+ | Male | | | 1 Male | | Female | | | 1 Female | | | Male | | 1 Male | | | Female | | 1 Female | | | | Male | 1 Male

问题 I have 10 boxes, each box can hold one item from a group/type of items, each 'group' type only fits in one of the 10 box types. The item pool can have n number of items. The groups have completely distinct items. Each item has a price, i want an algorithm that will generate all the different possibilities, so i can figure out different price points vs custom rank/weight assignment to each of the items, based on item attributes. so a smaller picture of the problem BOX A - can have item 1,2,3,4

问题 I got some strange behavior of combined generate_series. In 2 different polygons that I tried to fill with a grid, one grid was much rarer: The query was like this: SELECT osm_id , generate_series(floor(st_xmin(way))::int, ceiling(st_xmax(way))::int, 150) x, generate_series(floor(st_ymin(way))::int, ceiling(st_ymax(way))::int, 150) y from osm_polygon order by osm_id, x, y; I tried tracing the problem, and just entered min/max coordinates. Generate series from min/max values create correct

问题 I encountered the following problem in my programming book which I could not solve: Given a nxm grid, write a recursive algorithm to find the number of ways that this grid could be filled by 3x1 and 1x3 blocks. My logic for 3 x M grids: Find the number of block combinations that could be used to fill side M of the grid. I do not know how to change the logic to solve the question above. Could someone please advise? Thanks. 回答1: Let position be the upper left corner, and thereafter the first

问题 I've been having trouble with this problem. Basically, I have a list of integers, such as list = [1, 2, 3] I want to get all possible permutations of every subset. I know similar questions exist online, but I couldn't find one that does every permutation as well as every subset. In other words, I want: function(list) = [], [1], [2], [3], [1, 2], [2, 1], [1, 3], [3,1], [2, 3], [3,2], [1, 2, 3], [1, 3, 2], [2, 1, 3], [2, 3, 1], [3, 1, 2], [3, 2, 1] I understand the output will get extremely

问题 This question already has answers here : How to Generate Combinations of Elements of a List<T> in .NET 4.0 (5 answers) Closed 4 years ago . I have a list of items that contains the above properties. Id Amount PackageNbr What I need to accomplish, is to get from this list, the items that have the NEAREST OR EQUAL sum of Amount to a specific value; but a condition should always be valid which is that the items returned should be from different PackageNbr. For example. listOfItems: ╔══════╦═════

问题 I have a sentence (string) and a function that generates all synonyms of a given word from WordNet. I would like to produce a list of all possible variations of my sentence based on its synonyms. Furthermore, I would like to maintain the order of the original sentence, meaning permutations should only contain synonyms of the first word as their first word, and permutations of the second word as their second word, etc. For example, if my input is: "5 centimeters" My output should be along the

问题 I need to generate the complete set of combinations obtained when choosing any 8 numbers from a vector of 25 elements. This can be done by using the Combinator function but is very slow for very large matrix and is becoming RAM consuming. Can anyone suggest a clever way to generate this? Example: using "sample 3 from vector of 4" would yield the following result ( H=3 and L=4 ): 1 1 1 1 1 2 1 1 3 1 1 4 1 2 2 1 2 3 1 2 4 1 3 3 1 3 4 1 4 4 2 2 2 2 2 3 2 2 4 2 3 3 2 3 4 2 4 4 3 3 3 3 3 4 3 4 4 4