average

问题 The following MATLAB code runs forever on 10^5 square matrix A. However, it runs for a few seconds on 10^3 square matrix. Is there any way to speed it up? function [meanNV]=calcMeanNV_k(A,V,d) %A: input matrix (n x n) %V: eigenvectors of k-th largest eigenvalues (n x 1) %d: degrees of each node (n x 1) %meanNV: mean of neighbors vectors (n x 1) m=size(A,2); meanNV=zeros(113336); for i=1:m sumNode = 0; for j=1:m if A(i,j)==1 sumNode=sumNode+V(j); end end [meanNV(i)]=sumNode/d(i); end 回答1:

问题 I am reaching the limit of my basic MDX knowledge on a problem, if anyone has an idea, every help will be welcome Situation This is the hierarchy I'd like to deal with. In my fact_table I have a [Measures].[Sales] measure. [All Management].[TemplateMgt].[CityMgt].[DistricMgt].[StoreMgt] [All Management].[TMP-00.002].[London].[DistricMgt].[Shoe001] [All Management].[TMP-00.002].[London].[DistricMgt].[Hat001] [All Management].[TMP-00.002].[London].[DistricMgt].[Electronic001] [All Management].

问题 I am a beginner for Spotfire. I have a problem about the average calculation per each 15 mins by calculated column. A sample table could be like this: id time-stamp value 1 7/1/2016 12:01:01 AM 1.1 2 7/1/2016 12:05:03 AM 0.9 3 7/1/2016 12:08:04 AM 1.2 4 7/1/2016 12:09:06 AM 0.8 5 7/1/2016 12:12:09 AM 0.4 6 7/1/2016 12:14:10 AM 0.6 7 7/1/2016 12:15:12 AM 1.3 8 7/1/2016 12:18:04 AM 1.4 9 7/1/2016 12:21:06 AM 0.7 10 7/1/2016 12:24:09 AM 1.7 11 7/1/2016 12:31:10 AM 0.5 12 7/1/2016 12:39:12 AM 1.3

问题 Here is an example of the type of data that I am trying to manipulate: 1213954013615]: 992 1213954013615]: 993 1213954013615]: 994 1213954013615]: 995 1213954013615]: 995 1213954013615]: 996 1213954013615]: 996 1213954013615]: 996 1213954013615]: 998 1213954247424]: 100 1213954247424]: 1002 1213954247424]: 1007 1213954303390]: 111 1213954303390]: 1110 1213954303390]: 1111 1213954303390]: 1112 1213954303390]: 1114 1213954303390]: 112 1213954303390]: 112 1213954303390]: 112 1213954303390]: 112

问题 I'm trying to calculate a forecast of sales based on the 3 previous months which either can be actuals or forecast. company_id Year Month Actuals Forecast 123456 2014 1 10 123456 2014 2 15 123456 2014 3 17 123456 2014 4 14.00 123456 2014 5 15.33 123456 2014 6 15.44 123456 2014 7 14.93 Month 4 = (10+15+17)/3 Month 5 = (15+17+14)/3 Month 6 = (17+14+15.33)/3 Month 7 = (14+15.33+15.44)/3 Let's say I want to calculate the forecast for the next 18 months for each company. I'm looking at the data

问题 I'm using PostgreSQL 9.6. I have a table like this: mac sn loc time date vin1 vin2 vin3 1a34 4as11111111 aaaa 7:06:18 1/1/2018 447.42 472.32 682.59 1a34 4as11111111 aaaa 7:06:43 1/1/2018 455.97 476.25 682.59 1a34 4as11111111 aaaa 7:07:35 1/1/2018 470.88 484.2 682.5 I need to calculate the average of the vin1 , vin2 , vin3 within time intervals of 300 sec (5 min). For example, starting from the first time (7:06:18 - 7:11:18), for the dates in range. I can select the data I need with this query

问题 I have a simple plot which feature a lot of data points, when i have have graph. Is there a way that i can simple click on all these point and allow matlab to give me a average value of them? Thank you 回答1: The easiest way if you don't want to do it programmatically would be to use the data brush and statistics. I used plot(rand(1,200)) to generate my data. After it has plotted go to Tools > Data Statistics. Y-mean is what you are looking for. alt text http://www.thinkextensively.com/misc

问题 I'm working with a sqlite database. The tables are: ID_TABLE POINTS_A_TABLE POINTS_B_TABLE id number id_a points_a id_a points_a -------------- ---------------- ---------------- smith 1 smith 11 ... gordon 22 gordon 11 butch 3 butch 11 sparrow 25 sparrow white 76 white 46 and so on. After these commands select id, points_a_table.points_a, points_b_table.points_a, points_c_table.points_a, points_d_table.points_a from id_table left join points_a_table on points_a_table.id_a = id_table.id left

问题 Suppose I have INT column, and I am using -1 to signify that no data was available at the time of the INSERT. I'd like to get an AVG of all values of this column that are 0 or larger. Is this possible? Thanks. I forgot to mention that I'm doing this alongside other AVG's, so it's select avg(a), avg(b), avg(d) from tab; ... so I can't use b>0... because the others need to use the row data regardless of this one column's data being -1. It occurs to me though that I could augment the AVG result

问题 Consider a L x L size matrix M, whose entries can be either 0 or 1. Each element is 1 with probability p and 0 with probability 1 - p. I will call the elements labelled 1 as black elements and elements labelled 0 as white elements. I'm trying to write a code which: Generates a random matrix with entries 0's and 1's. I need to input size of matrix L and the probability p. Labels all the black elements belonging to the same cluster with the same number. ( Define a cluster of black element as a