analysis

问题 Is it possible to detect the codec used in an RTP stream by analyzing the RTP stream alone? I know about the payload type (PT) field in the RTP header -- that can be used to identify codecs that have statically assigned PT numbers. What about the other codecs that use the dynamic PT number range? Are there any heuristics to detect the type of the payload? I'm interested in all kinds of solutions, even if the detection works for one codec only. 回答1: Sure, you can sniff around the packet to see

问题 I was trying to find the time complexity for a for loop. below is loop detail. for(int i=N;i>1;i=i/2) { for(int k=0;k<i;k++){ sum++; } } Below is any find for the problem. Please correct me if i am going worng. Inner loop will be exceute N+N/2+N/4+N/8.... so tn=ar^(n-1) . So replacing Tn=1 , a=N and r=1/2 1=N(1/2)^(n-1) therefore 1/2N=(1/2)^n So sum of inner loop is a GP. Sn=a(1-r^n)/(1-r) Replacing a=N,r=1/2 , we get Sn=N(1-(1/2N))/(1-1/2) therefore Sn=2N-1 I am not sure if complexity is N .

问题 I think this is probably a beginner question about big-O notation. Say, for example, I have an algorithm that breaks apart an entire list recursively(O(n)) and then puts it back together (O(n)). I assume that this means that the efficiency is O(n) + O(n). Does this simplify to 2O(n), O(2n), or O(n)? From what I know about this notation, it would be O(2n) and using the rules of asymptotic notation you can drop the 2, giving an efficiency of O(n). If we were trying to find a lower bound, though

问题 I'm relative new to Sonar - especially to writing my own Sonar Plugin. After some successful trials, I got stuck now. I have written a simple Plugin which only should transfer source files (*.abap -Files) to the sonar server. and in my plugin I have an AbapLangauge (extended from AbstractLangauge) package sonarplugin; import org.apache.commons.lang.StringUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.sonar.api.resources.AbstractLanguage; public class AbapLanguage

问题 I need to align two sound signals in order to map one into the other (both signals corresponds to the same behavior). I try to implement the python code from: https://nipunbatra.github.io/blog/2014/dtw.html as a function to be called by my code. An example: #time warping sound function trial import numpy as np import matplotlib.pyplot as plt from pylab import * my_path ='/home/...' def time_warping (x,y,fs,name): distances = np.zeros((len(y), len(x))) accumulated_cost = np.zeros((len(y), len

问题 I've the variable varCurrentYear varCurrentYear = Year(Today()) And I wrote this set analysis expression The result it’s not correct. By the way If the variable is declared in this way varCurrentYear = 2014 The result is correct. Why? Thank's 回答1: I'd use Sum({$<Year={'$(varCurrentYear)'}>}Orders) resp without quotes if varCurrentYear is numeric Sum({$<Year={$(varCurrentYear)}>}Orders) See http://tools.qlikblog.at/SetAnalysisWizard/?sa=MCKA Regards Stefan 回答2: I know it looks strange, but you

问题 Normal practice is to use case studies, construct work- and data-flows, etc. But this does not necessarily create a shared vocabulary between the user/sponsor and the analyst-designer: one or the other, both normally, will have to acquire terms and views of the "internals" of the others area of expertise, and this usually leads to misunderstandings and meetings-to-clarify (enter RAD-techniques like Evolutionary Prototyping), etc. The user/sponsor is focused on his/her needs/environment, and

问题 I am very new to using R. I have searched regarding this but couldn't find any pointers. I am doing cohort analysis and the data under Month1 is the number of new users that signed up for in that particular month. Month2 is the number of users that continued from previous month's sign up. I have a set of data as follows Month_Start_Date Month1 Month2 Month3 Month4 Month5 Month6 2010-01-01 10 12 11 9 3 15 2010-02-01 10 9 11 9 3 15 2010-03-01 10 9 7 9 3 15 2010-04-01 10 7 5 6 3 15 2010-05-01 10

问题 I'm using Adobe Flash CS 4 and would like to know are there any profiler or memory analysis tools available for it ? (actionscript 3). I know there are available tools for Flex, but are there for Flash CS 4 instead? Thanks. 回答1: I'm sure there is a program out there, still looking myself, but I found this on a forum: Most AS3 beginners have programmed something and then heard about memory leaks. So first I'm going to cover ways to detect and fix leaks in preexisting code, and then talk about

问题 I am using sysmon to capture a bunch of event information (network connections, DLL loads, etc). I want to pull that information and use it for various purposes, but it doesn't seem like there is any way to retrieve the nested logs. They reside at Event Viewer/Applications and Services/Microsoft/Windows/Sysmon/Operational All of the code I've tried only pulls the "standard" Event Logs. For example: EventLog[] eventLogs = EventLog.GetEventLogs(); has "Application", "Hardware Events", "Internet