indices

问题 I have an 1D array of weights, w and an array of capacities c of the same shape as w. I need to find the smallest array of indices such that when w is split by these indices, the cumsums of split arrays less than the corresponding capacities in c. Given an array of weights and capacities as follows: w = [1,2,3,4,5,6]; c = [3, 12, 7, 6, 12] I need to find the smallest number of indices 'i' so that the cumsums of split arrays less than the corresponding capacities in c. In this case, i = [2, 3,

问题 I have an 1D array of weights, w and an array of capacities c of the same shape as w. I need to find the smallest array of indices such that when w is split by these indices, the cumsums of split arrays less than the corresponding capacities in c. Given an array of weights and capacities as follows: w = [1,2,3,4,5,6]; c = [3, 12, 7, 6, 12] I need to find the smallest number of indices 'i' so that the cumsums of split arrays less than the corresponding capacities in c. In this case, i = [2, 3,

问题 I am trying to join 2 elasticsearch indices by using terms filter lookup. I referred to http://www.elasticsearch.org/blog/terms-filter-lookup/ and http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-terms-filter.html. These Examples lookup on an array of fields like "followers" : ["1", "3"] and join works fine for similar data. My requirement is to join with a field inside an array of objects. When I extend the above example to include an array of objects, my query

问题 Looking through documentation for vertex arrays in OpenGL, two of the most common memory types used for indices I found were GLubyte (GL_UNSIGNED_BYTE) and GLshort (GL_SHORT). I was wondering if there was any actual difference between using the two for indices Thanks, Dragonwrenn 回答1: GL_UNSIGNED_BYTE is OK for models which have at most 256 vertices - that's really not many. GL_UNSIGNED_SHORT , taking 2 bytes, would limit you to 65536 vertices - still that's kind of few. I'd say the most

问题 I need to generate lower triangle matrix indices (row and columns pairs). The current implementation is inefficient (memory wise) specially when symmetric matrix gets big (more than 50K rows). Is there a better way? rows <- 2e+01 id <- which(lower.tri(matrix(, rows, rows)) == TRUE, arr.ind=T) head(id) # row col # [1,] 2 1 # [2,] 3 1 # [3,] 4 1 # [4,] 5 1 # [5,] 6 1 # [6,] 7 1 回答1: Here's another approach: z <- sequence(rows) cbind( row = unlist(lapply(2:rows, function(x) x:rows), use.names =

问题 If I print a matrix, it is shown with row and column indices in the console. E.g. > print(diag(3)) [,1] [,2] [,3] [1,] 1 0 0 [2,] 0 1 0 [3,] 0 0 1 How can I suppress the column and row indices? I.e. something like this: > print(diag(3), indices=FALSE) 1 0 0 0 1 0 0 0 1 I can see that the cwhmisc package should contain a printM function to do this according to the documentation but it is not there when I load cwhmisc. Also, this seems like something you should be able to to in base R. 回答1: The

问题 If I print a matrix, it is shown with row and column indices in the console. E.g. > print(diag(3)) [,1] [,2] [,3] [1,] 1 0 0 [2,] 0 1 0 [3,] 0 0 1 How can I suppress the column and row indices? I.e. something like this: > print(diag(3), indices=FALSE) 1 0 0 0 1 0 0 0 1 I can see that the cwhmisc package should contain a printM function to do this according to the documentation but it is not there when I load cwhmisc. Also, this seems like something you should be able to to in base R. 回答1: The

问题 It's been a little while since I've done matrix operations in MATLAB, so please forgive me if this is easily solvable. I have some NxM matrix A , and I would like to perform an operation on the column indices of A . I know how to do this using a for loop, but since I'm using MATLAB I'd like to make use of MATLAB's ability to do operations on matrices fast. Suppose I have a function called myFunc . Is there a way to do the following without a for loop (such as with matrix multiplication): for

问题 I want to get indices of all occurences of character elements in some word. Assume these character elements I look for are: l , e , a , z . I tried the following regex in grep function and tens of its modifications, but I keep receiving not what I want. grep("/([leazoscnz]{1})/", "ylaf", value = F) gives me numeric(0) where I would like: [1] 2 3 回答1: To use grep work with individual characters of a string, you first need to split the string into separate character vectors. You can use

问题 What's the best Matlab/Octave idiom, given idx a vector of indices, to get the sorted vector of idx +/-1 ? I have an n x 7 data matrix, column 3 is an integer label, and I'm interested in viewing the neighborhood of discontinuities on it. Hence I get the corresponding indices: idx = find(diff(data(:,3)) > 0) 5297 6275 6832 ... 20187 Then if I want to view that neighborhood +/- 1 on my column (e.g. on the (mx2) matrix [idx-1; idx+1] ), I need to form the vector of idx-1, idx+1 either