analysis

问题 I was working is this simple exercise about writing certified function using subset types. The idea is to first write a predecessor function pred : forall (n : {n : nat | n > 0}), {m : nat | S m = n.1}. and then using this definition give a funtion pred2 : forall (n : {n : nat | n > 1}), {m : nat | S (S m) = n.1}. I have no problem with the first one. Here is my code Program Definition pred (n : {n : nat | n > 0}) : {m : nat | S m = n.1} := match n with | O => _ | S n' => n' end. Next

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 9 years ago . Which one among the two languages is good for statistical analysis? What are the pros and cons, other than accessibility, for each? 回答1: MATLAB Good for beginners Good for interactive sessions Python (with SciPy)

问题 I have essentially done the following: import cProfile, pstats, StringIO pr = cProfile.Profile() pr.enable() # ... my code did something ... pr.disable() s = StringIO.StringIO() sortby = 'cumulative' ps = pstats.Stats(pr, stream=s).sort_stats(sortby) ps.dump_stats('stats.dmp') # dump the stats to a file named stats.dmp So now i have the file named 'stats.dmp' stored offline. How can i use pstats to analyze this file for human consumption? Thanks in advance. 回答1: Here's what i found out and

问题 I have a problem and I can not get the purpose of lines (14,15,16,17) of this site for Select algorithm. The site which had this question was located here. EDITED: Also, is this correct to write these lines for the part "partition and recur by using the pivot" ? ("m" is my pivot and "i" is the input of this algorithm) arrOne<--{a of arr : a<m} arrTwo<--{a of arr : a>m} if (i < m ) then return Select(arrOne,i) else if (i > m) then return Select(arrTwo,i-m) else return m 回答1: This is where it

问题 I'm looking for a C# source code that performs a frequency analysis on a WAV file and displays the results in a graph, similar to the one displayed in apps like WavePad. Do you know where I can find such a code? Thanks! 回答1: It's in a very experimental state at the moment, but if you have a look at the WPFDemo project in NAudio, it performs an FFT on the incoming microphone data or sound file you play and plots it under the wave-form. 来源： https://stackoverflow.com/questions/1377661/frequency

问题 I have some SQL thats getting run and it is taking to long to return the results / parse / display, etc. in a asp.net c# application. I have SQL Server Management Studio 2008 R2 installed to connect to a remote SQL Server 2000 machine. Is there a Query Analyzer or profiler I can use to see whats going on? I'm not sure if I'm sending too many requests, if the requests are taking too long, if there are additional indexes I can add to speed things up etc. EDIT: Any free tools out there that are

问题 I'm trying to split a dictionary with a list within a pandas column but it isn't working for me... The column looks like so when called; df.topics[3] Output "[{'urlkey': 'webdesign', 'name': 'Web Design', 'id': 659}, {'urlkey': 'productdesign', 'name': 'Product Design', 'id': 2993}, {'urlkey': 'internetpro', 'name': 'Internet Professionals', 'id': 10102}, {'urlkey': 'web', 'name': 'Web Technology', 'id': 10209}, {'urlkey': 'software-product-management', 'name': 'Software Product Management',

问题 I have a table like below: id name role1 role2 role3 ------------------------- 1 John y n y 2 Pete n y y 3 Den n y y 4 Mat y n n After I filter the table by using role1='Y' , I lost Pete and Den. How can I use the analysis to build a table like below: Count (Y) Role1 3 Role2 2 Role3 3 I tried everything. Please help Thanks 回答1: If your database is Oracle 11g or later you can use the unpivot clause SELECT usr_role, COUNT(*) role_count FROM (SELECT * FROM table_name UNPIVOT (hasRole FOR usr

问题 Building upon the solution given by @olly (Power BI: How to scenario analysis, where the selector "looks up" the select value from slicer and gets values from that row) & file: https://pwrbi.com/so_55281950-2/ In the sample file a "what if" or scenario analysis is created. Two slicers are used, one which selects the scenario, and another one which selects the objects to apply the scenario on. @Olly provided a clever solution to deal with the situation: Value + Trend = SUMX ( 'Demo Fact Table'

问题 Hello I've tried my best to understand big-theta and now I get the main conception of the proofs for Big-Oh and Big-Omega but i couldn't find and example that is close to my excercise, because i cant do the proof for that one: Prove, by exhibiting witnesses, that 4n^2 + 4n = Big-Theta(2n^2 + 32n) I know that i have to prove it for Big-Oh and Big-Omega in order to prove Big-Theta, but i have no idea how to start. I mean the equation on the right side confuses me. 回答1: By the definition of big