analysis

问题 I am analyzing a set of text in a .txt file. the file has 30 lines and each line contains different phrases both containing text, numbers, and symbols. what's the best way to import this file into Matlab for analyses (i.e.: how many Capital I's are in the text file or how many #text phrases are in the file (analyzing tweets on each line) 回答1: I think you'd best read the file line-by-line and save each line in a cell of a cell array: fid = fopen(filename); txtlines = cell(0); tline = fgetl(fid

问题 So I have tried and tried to follow similar questions asked like this one, but to no success. It's really simple - I have some .root files and can see the histograms in ROOT but want to export the data as a .txt or similar to be able to analyse it in other programs. 回答1: Here is working example. Reads in a root file with three branches, named TS, ns, and nserr. #include <iostream> #include "TFile.h" #include "TTree.h" #include <fstream> using namespace std; void dumpTreeTotxt(){ TFile *f=new

问题 I'm trying to load a sample from a 4GB+ mono WAV file (total file duration 24h, I'm loading a 15min slice). library(tuneR) so <- readWave( "file.wav", from = 1, to = 15, units = "minutes" ) This is the traceback Error in readBin(con, int, n = N, size = bytes, signed = (bytes != 1), : invalid 'n' argument 2 readBin(con, int, n = N, size = bytes, signed = (bytes != 1), endian = "little") 1 readWave(filePath, from = 1, to = 15, units = "minutes") This happens for every 'from' and 'to' params (5

问题 For my startup, I track everything myself rather than rely on google analytics. This is nice because I can actually have ips and user ids and everything. This worked well until my tracking table rose about 2 million rows. The table is called acts , and records: ip url note account_id ...where available. Now, trying to do something like this: SELECT COUNT(distinct ip) FROM acts JOIN users ON(users.ip = acts.ip) WHERE acts.url LIKE '%some_marketing_page%'; Basically never finishes. I switched

问题 I made a filter in SolR as following : <fieldtype name="tokenization_stopwords" class="solr.TextField" positionIncrementGap="100"> <analyzer type="query"> <tokenizer class="solr.StandardTokenizerFactory"/> <filter class="solr.StopFilterFactory" words="stopwords.txt" ignoreCase="true"/> </analyzer> </fieldtype> When I'm using this filter in the "Analysis" section, it works. However, I'd like to be able to get the result of this analysis as a JSON. Does anyone knows how to do this ? 回答1: In

问题 I have been thinking over this problem for a few days now and am hung up on calculating the number of times the second nested for-loop will run. I believe that I have the correct formula for determining the running time for the other two for-loops, but this third one has me hung up. I have the first loop running n-1 times. The equation to determine the number of times loop #2 runs is; The summation of 1 to n-1. If anyone could help me understand how to find the number of times loop #3 runs it

问题 I have the following formula that I have to simplify in order to get the time complexity of my algorithm : (n^2-n)/3. Are there any rules that apply that can allow me to simplify this expression even further to a more "common" Θ(n^2) or something like that (I'm assuming that's what the result will be, might be wrong). I simply don't know how to deal with the substraction here. Usually, if two values add each other, you only consider the one that is the highest to analyse the complexity of the

问题 Say I have conducted an experiment where I've left a python program running for some long time and in that time I've taken several measurements of some quantity against time. Each measurement is separated by some value between 1 and 3 seconds with the time step used much smaller than that... say 0.01s. An example of such an even if you just take the y axis might look like: [...0,1,-1,4,1,0,0,2,3,1,0,-1,2,3,5,7,8,17,21,8,3,1,0,0,-2,-17,-20,-10,-3,3,1,0,-2,-1,1,0,0,1,-1,0,0,2,0...] Here we have

问题 I have a dataset with 70 cases (participants in a study). Is there a function that can calculate the mean of these 70 cases such that each individual case is not included in the analysis. This would look like: "mean for case x = (value(1) + ... value(n) - value(x))/n" Any information will help. 回答1: You could just do what you've suggested and remove each case from the total: x <- c(1:10) (sum(x) - x) / (length(x) - 1) #[1] 6.000000 5.888889 5.777778 5.666667 5.555556 5.444444 5.333333 5

问题 I have a c# solution that contains some class files. With Roslyn I am able to parse a solution to obtain a list of projects within the solution. From there, I can get the documents in each project. Then, I can get a list of every ClassDeclarationSyntax. This is the starting point. foreach (var v in _solution.Projects) { //Console.WriteLine(v.Name.ToString()); foreach (var document in v.Documents) { SemanticModel model = document.GetSemanticModelAsync().Result; var classes = document