indices

OpenGL: Are VAOs and VBOs practical for large polygon rendering tasks?

由 坚强是说给别人听的谎言 提交于 2019-12-10 11:27:08
问题 If you wanted to render a large landscape with thousands of polygons in the viewing frustum at a time as well as the user's viewpoint changing constantly, is it practical to use VAOs or VBOs? I mean, every time the player's position or camera rotation changed, you would have to recompute the vertex data in order to properly cull any vertices or scenes which are no longer seen in order to keep a good FPS count. But in doing this, your FPS count would go down because you are, well, repacking

indices of occurence of each row in MATLAB

由 你。 提交于 2019-12-10 11:26:02
问题 I have two matrices, A and B . ( B is continuous like 1:n ) I need to find all the occurrences of each individual row of B in A , and store those row indices accordingly in cell array C . See below for an example. A = [3,4,5;1,3,5;1,4,3;4,2,1] B = [1;2;3;4;5] Thus, C = {[2,3,4];[4];[1,2,3];[1,3,4];[1,2]} Note C does not need to be in a cell array for my application. I only suggest it because the row vectors of C are of unequal length. If you can suggest a work-around, this is fine too. I've

Dependant non-type template parameter and variadic template

由 此生再无相见时 提交于 2019-12-10 10:15:18
问题 I am trying to extend the possibilities offered by std::integer_sequence with a new class named integer_range (which obiously creates a sequence of integers between two bounds). My implementation was based of my answer to this question that I tried to adapt to std::integer_sequence : namespace details { template<typename Int, Int C, Int P, Int... N> struct increasing_integer_range: increasing_integer_range<Int, C-1, P+1, N..., P> {}; template<typename Int, Int C, Int P, Int... N> struct

BufferGeometry offsets and indices

由 本小妞迷上赌 提交于 2019-12-10 08:11:21
问题 I was just wondering for a while now what exactly "offsets" and "indices / index" are. Offsets are e.g. mentioned in https://github.com/mrdoob/three.js/blob/dev/src/core/BufferGeometry.js and indices were mentioned in IndexedGeometry, however I can't currently find it anymore in the dev tree. Although indices seem rather obvious and although I could dive into the code to figure out some maybe-correct answer for myself I'd love to hear an "official" statement :) Thanks! 回答1: There are two ways

list match in python: get indices of a sub-list in a larger list

由 情到浓时终转凉″ 提交于 2019-12-09 04:51:36
问题 For two lists, a = [1, 2, 9, 3, 8, ...] (no duplicate values in a, but a is very big) b = [1, 9, 1,...] (set(b) is a subset of set(a), 1<<len(b)<<len(a)) indices = get_indices_of_a(a, b) how to let get_indices_of_a return indices = [0, 2, 0,...] with array(a)[indices] = b ? Is there a faster method than using a.index , which is taking too long? Making b a set is a fast method of matching lists and returning indices (see compare two lists in python and return indices of matched values ), but

SQLite3 how do I use indices?

由 試著忘記壹切 提交于 2019-12-08 19:36:22
问题 I’m working on SQLite3 indices. Here’s a table COMAPNY: CREATE TABLE COMPANY( ID INT PRIMARY KEY NOT NULL, NAME TEXT NOT NULL, AGE INT NOT NULL, ADDRESS CHAR(50), SALARY REAL ); INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) VALUES (1, 'Paul', 32, 'California', 20000.00 ); INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) VALUES (2, 'Allen', 25, 'Texas', 15000.00 ); INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) VALUES (3, 'Teddy', 23, 'Norway', 20000.00 ); INSERT INTO COMPANY (ID,NAME,AGE

python error : too many indices for array

由 旧城冷巷雨未停 提交于 2019-12-08 03:24:13
问题 My input was a csv file which was imported to postgresqldb .Later i am building a cnn using keras.My code below gives the following error "IndexError: too many indices for array". I am quite new to machine learning so I do not have any idea about how to solve this. Any suggestions? X = dataframe1[['Feature1','Feature2','Feature3','Feature4','Feature5','Feature6','Feature7','Feature8','Feature9','Feature10','Feature11\1','Feature12','Feature13','Feature14']] Y=result[['label']] # evaluate

Finding the start and stop indices in sequence in R

由 爷，独闯天下 提交于 2019-12-08 00:51:45
问题 Suppose I have the sequence: x = c( 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0) Is there an elegant way in R to return the start and stop indices of each sequence of 1s? The answer should be a 2 column array with nRows = number of sequences of 1s: startIndx = [ 1, 5, 7 ] stopIndex = [ 2, 5, 9 ] Thanks. BSL 回答1: Assuming your vector consists of 0 and 1 values: which(diff(c(0L, x)) == 1L) #[1] 1 5 7 which(diff(c(x, 0L)) == -1L) #[1] 2 5 9 Otherwise you'd need something like x <- x == 1L first. 回答2:

Python: Delete all list indices meeting a certain condition

由 一笑奈何 提交于 2019-12-07 07:06:59
问题 to get right down to it, I'm trying to iterate through a list of coordinate pairs in python and delete all cases where one of the coordinates is negative. For example: in the array: map = [[-1, 2], [5, -3], [2, 3], [1, -1], [7, 1]] I want to remove all the pairs in which either coordinate is < 0, leaving: map = [[2, 3], [7, 1]] My problem is that python lists cannot have any gaps, so if I loop like this: i = 0 for pair in map: for coord in pair: if coord < 0: del map[i] i += 1 All the indices

indices of occurence of each row in MATLAB

由 …衆ロ難τιáo~ 提交于 2019-12-06 11:50:19
I have two matrices, A and B . ( B is continuous like 1:n ) I need to find all the occurrences of each individual row of B in A , and store those row indices accordingly in cell array C . See below for an example. A = [3,4,5;1,3,5;1,4,3;4,2,1] B = [1;2;3;4;5] Thus, C = {[2,3,4];[4];[1,2,3];[1,3,4];[1,2]} Note C does not need to be in a cell array for my application. I only suggest it because the row vectors of C are of unequal length. If you can suggest a work-around, this is fine too. I've tried using a loop running ismember for each row of B , but this is too slow when the matrices A and B
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