analysis

In Complexity Analysis why is ++ considered to be 2 operations?

蹲街弑〆低调 提交于 2019-12-04 03:33:53
问题 In my Computer Science II class, the professor considers ++,--,*=, etc. to be 2 operations. However, at the Assembly level this is not really two operations. Can someone explain or is this just for the sake of simplicity? 回答1: I'd actually consider it to be 3 operations: read, increment (or whatever), write. That's assuming it's reading from some sort of shared memory into some sort of local storage (e.g. register or stack), operating on the local storage, then writing back. How many

How many primitive operations in a simple loop?

喜夏-厌秋 提交于 2019-12-03 23:19:58
I have a bunch of code to find the primitive operations for. The thing is that there aren't really many detailed resources out on the web on the subject. In this loop: for i:=0 to n do print test end How many steps do we really have? In my first guess I would say n+1 considering n for the times looping and 1 for the print. Then I thought that maybe I am not precise enough. Isn't there an operation even to add 1 to i in every loop? In that matter we have n+n+1=2n+1. Is that correct? The loop can be broken down into its "primitive operations" by re-casting it as a while : int i = 0; while (i < n

Learning how to analyse a project

廉价感情. 提交于 2019-12-03 22:13:09
I've just stumbled into the job of analysing a project for one of my company's clients (an SMB). I am a .Net developer (5 years) with little experience in analysing software (UML from school). We've just finished two weeks of talking with the users and got a nice big list of requirements. Obviously we've filtered out the most important requirements and had to mark a bunch as 'out of scope'. I have just started making some usecases, but feel I don't have the required expertise to bring this entire project to a good end. I'd like to know if someone has made the leap from developer to analyst and

about counting sort algorithm

99封情书 提交于 2019-12-03 20:49:19
I have read a counting sort algorithm which is like this: Counting Sort(A[1,..n]) //C[1,...k] is the temporary memory and k is the range of integers for i<-- 1 to k C[i]<-- 0 for j<-- 1 to n C[A[j]]<--C[A[j]]+1 for i<--2 to k C[i]<--C[i]+C[i-1] for j<--n downto 1 B[C[A[j]]]<--A[j] C[A[j]]<--C[A[j]]-1 I want to know that if I change the last for to this: for j<--1 to n ,the algorithm will be correct too???(is there any way to show that with this "for" the algorithm will be correct??? ) also in this way the algorithm is stable too? thanks The algorithm is correct both ways. It is also stable as

Lock analyser for Java application

倖福魔咒の 提交于 2019-12-03 16:49:48
I have two versions of a Java application which use different concurrency logic. I want to analyze and compare their performance (such amount of time a lock was acquired etc.) so that I can use the better one. I found out a tool IBM Lock Analyzer for Java but it is neither open source nor JDK version independent. It requires an IBM®-supplied Java™ SDK or JRE. Another tool also from IBM is Multicore Software Development Kit and has the following problem "The testing and analysis tool of MSDK runs on Sun JDK, except the lock analysis tool. The performance tool requires an IBM JDK." So can

Prestashop compared to Zen-Cart and osCommerce [closed]

馋奶兔 提交于 2019-12-03 13:25:01
问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 8 years ago . I'm considering Prestashop for a new project. It seems to be younger than Zen-Cart and osCommerce. Since I just found it by Google, I

Is there a Elasticsearch plugin similar to the Solr analysis tool?

余生长醉 提交于 2019-12-03 12:43:45
Solr has the built-in "Analysis Screen" , which helps to debug the interplay between tokenizers and filters for specific field types: Is there a plugin for ElasticSearch that does something similar? Specifically, I want to see the input/ output of each filter, not only the end result of the analysis chain. I used Google quite intensively on this, but didn't find anything. https://www.found.no/play/#analysis contains exactly the feature I want (scroll down to "myAnalyzer"), but unfortunately it's not something I can run on my index. But it shows that such a feature is possible. Edit: I know

Methods in Object-Oriented Design

余生长醉 提交于 2019-12-03 12:41:04
问题 Q1. In my university studies of object-oriented modelling and design they recommend thinking about what an object can do for its method, and what its responsibilities are for its attributes. All attempts at clarification have resulted in further confusion. This tends to generate a class diagram with actors who have all the actions, and inner classes which only hold data. This doesn't seem correct. Is there another way of thinking about how to model the objects? Q2. Also, the course seems to

Image analysis in R

拜拜、爱过 提交于 2019-12-03 08:58:40
问题 I would like to know how I would go about performing image analysis in R. My goal is to convert images into matrices (pixel-wise information), extract/quantify color, estimate the presence of shapes and compare images based on such metrics/patterns. I am aware of relevant packages available in Python (suggestions relevant to Python are also welcome), but I am looking to accomplish these tasks in R. Thank you for your feedback. -Harsh 回答1: Also check out the RASTER package on the R-Forge

Utilise Surv object in ggplot or lattice

痴心易碎 提交于 2019-12-03 08:02:22
Anyone knows how to take advantage of ggplot or lattice in doing survival analysis? It would be nice to do a trellis or facet-like survival graphs. So in the end I played around and sort of found a solution for a Kaplan-Meier plot. I apologize for the messy code in taking the list elements into a dataframe, but I couldnt figure out another way. Note: It only works with two levels of strata. If anyone know how I can use x<-length(stratum) to do this please let me know (in Stata I could append to a macro-unsure how this works in R). ggkm<-function(time,event,stratum) { m2s<-Surv(time,as.numeric