matrix

问题 In Ocatave / Matlab, I can use magic() to get a magic square, e.g., magic(4) 16 2 3 13 5 11 10 8 9 7 6 12 4 14 15 1 Definition: A magic square is an N×N grid of numbers in which the entries in each row, column and main diagonal sum to the same number (equal to N(N^2+1)/2 ). How can I generate the same using NumPy? 回答1: This implementation follows Matlab's and should give exactly the same results with the following exception: it throws an error if n < 3 rather than return a non-magic square [

问题 My goal is to to turn a row vector into a column vector and vice versa. The documentation for numpy.ndarray.transpose says: For a 1-D array, this has no effect. (To change between column and row vectors, first cast the 1-D array into a matrix object.) However, when I try this: my_array = np.array([1,2,3]) my_array_T = np.transpose(np.matrix(myArray)) I do get the wanted result, albeit in matrix form ( matrix([[66],[640],[44]]) ), but I also get this warning: PendingDeprecationWarning : the

问题 Hi im trying to code the following coefiicient matrix A in a for loop in Matlab. N is the total number of elements. And i and j are obtained from k . Could someone help me please code the A matrix correctly for any N value. The A and b are shown for k = 1:N A(k,k) = 4; % the diagonal element, corresponding to Tij, is always 4 % In the following, we look at the four neighbours of (i,j) that are % involved in the 5-point formula i = mod(k-1,nx)+1; j = (k-i)/nx+1; %get (i,j) from k %boundary

问题 I am working on a multi-tab dashboard for commercial stores related variables with a star schema. I have many tabs which all feed from different tables and are all linked through a table ("Slicer_table") that feeds the slicer in every tab and is related to each table through a key of a concatenation of descriptive variables of the stores. In one of those tabs, I calculate a rate between some event and the total number of clients. For this calculus, I use 2 tables, one which feeds all the

问题 I am trying to implement one of the solutions to the question about How to align two GloVe models in text2vec?. I don't understand what are the proper values for input at GlobalVectors$new(..., init = list(w_i, w_j) . How do I ensure the values for w_i and w_j are correct? Here's a minimal reproducible example. First, prepare some corpora to compare, taken from the quanteda tutorial. I am using dfm_match(all_words) to try and ensure all words are present in each set, but this doesn't seem to

问题 Is there a way to obtain a K NxN matrix and a NxK N from a K NxK N square matrix? K: number of industries in the data. N: number of countries in the data. Each row/colname encodes the 3 code country name e.g. USA, the seperator .c and the number of the industry, e.g. USA.c1 . I tried to use colSums and rowSums but the functions return only one number instead of N numbers. Minimal working example for a matrix of 2 industries and 2 countries BEL.c30 BEL.c31 CAN.c25 CAN.c26 BEL.c30 11844 14 1 0

问题 I have a 3x3 android.graphics.Matrix , and i want to apply all transformation to a 4x4 OpenGL Matrix for 2D transformations only. So far I have manage to apply rotation and scaling I am using the example from the android team HERE to render a triangle. I used this class for generating the android.graphics.Matrix, from finger gestures made by the user for scale , move and translate transformations. After that I attach the MatrixGestureDetector on the onTouchEvent from the View. In the

问题 I have a 2 data frames, one ( df1 ) that records the daily occurrence of different activities and another ( df2 ) that records properties of the occurred activity during the day. From df1 it is possible to identify the repeated occurrence of an activity as well the duration. When the day starts is specified by the Date variable. For example: id 12 the occurrence starts at day1 and ends at d7. In this case the occurrence is 7 and duration is 11. for id 123 the week starts at day 5 and ends at

问题 I have a 2 data frames, one ( df1 ) that records the daily occurrence of different activities and another ( df2 ) that records properties of the occurred activity during the day. From df1 it is possible to identify the repeated occurrence of an activity as well the duration. When the day starts is specified by the Date variable. For example: id 12 the occurrence starts at day1 and ends at d7. In this case the occurrence is 7 and duration is 11. for id 123 the week starts at day 5 and ends at

问题 This question already has answers here : How do you split a list into evenly sized chunks? (63 answers) Closed 3 years ago . I'm trying to create and initialize a matrix. Where I'm having an issue is that each row of my matrix I create is the same, rather than moving through the data set. I've tried to correct it by checking if the value was already in the matrix and that didn't solve my problem. def createMatrix(rowCount, colCount, dataList): mat = [] for i in range (rowCount): rowList = []