binary-data

This question was migrated from Cross Validated because it can be answered on Stack Overflow. Migrated 5 years ago . Learn more . In R, I want to generate a random sample of a discrete random variable: X , where: P(X=a)=P(X=-a)=1/2 . I have been searching for a function online, but there seems no direct function doing this. I think you are looking to generate samples of a Bernoulli random variable. A Bernoulli random variable is a special case of a binomial random variable. Therefore, you can try rbinom(N,1,p) . This will generate N samples, with value 1 with probability p , value 0 with

I am trying to search and replace some of the text (eg 'Smith, John') in this pdf form file (header.fdf, I presumed this is treated as binary file): '%FDF-1.2\n%\xe2\xe3\xcf\xd3\n1 0 obj\n<</FDF<</Fields[<</V(M)/T(PatientSexLabel)>><</V(24-09-1956 53)/T(PatientDateOfBirth)>><</V(Fisher)/T(PatientLastNameLabel)>><</V(CNSL)/T(PatientConsultant)>><</V(28-01-2010 18:13)/T(PatientAdmission)>><</V(134 Field Street\\rBlackburn BB1 1BB)/T(PatientAddressLabel)>><</V(Smith, John)/T(PatientName)>><</V(24-09-1956)/T(PatientDobLabel)>><</V(0123456)/T(PatientRxr)>><</V(01234567891011)/T(PatientNhsLabel)>><<

This question is related to this one . I was having no problems while printing raw binary data from a CGI script in Python 2, for example: #!/usr/bin/env python2 import os if __name__ == '__main__': with open(os.path.abspath('test.png'), 'rb') as f: print "Content-Type: image/png\n" print f.read() Here are the relevant response headers: > GET /cgi-bin/plot_string2.py HTTP/1.1 > User-Agent: curl/7.32.0 > Host: 0.0.0.0:8888 > Accept: */* > * HTTP 1.0, assume close after body < HTTP/1.0 200 Script output follows < Server: SimpleHTTP/0.6 Python/3.3.2 < Date: Fri, 13 Sep 2013 16:21:25 GMT < Content

I'm writing an ActiveX control for my friend, that should encapsulate encryption routines. It will be used from VB6 primarily. What data type should I choose for binary data like encryption key, initialization vector, input and output data so that it would be convenient for my friend to use it from VB6? I'm using Delphi 7 to write this ActiveX, if that matters. One choice is to use hexadecimal strings. What can be the other? kobik VB6 Binary data stored in Byte variables and arrays. Dim arrData() As Byte VB6 Application should pass that variable to your Delphi COM as OleVariant . Delphi COM

How does one process large binary data files in Clojure? Let's assume data/files are about 50MB - small enough to be processed in memory (but not with a naive implementation). The following code correctly removes ^M from small files but it throws OutOfMemoryError for larger files (like 6MB): (defn read-bin-file [file] (to-byte-array (as-file file))) (defn remove-cr-from-file [file] (let [dirty-bytes (read-bin-file file) clean-bytes (filter #(not (= 13 %)) dirty-bytes) changed? (< (count clean-bytes) (alength dirty-bytes))] ; OutOfMemoryError (if changed? (write-bin-file file clean-bytes)))) ;

I have some experience with Pragmatic-Programmer-type code generation: specifying a data structure in a platform-neutral format and writing templates for a code generator that consume these data structure files and produce code that pulls raw bytes into language-specific data structures, does scaling on the numeric data, prints out the data, etc. The nice pragmatic(TM) ideas are that (a) I can change data structures by modifying my specification file and regenerating the source (which is DRY and all that) and (b) I can add additional functions that can be generated for all of my structures

There appear to be some similar-looking long alphanumeric strings that commonly occur in Mach-O 64 bit executables and ELF 64-bit LSB executables among other symbols that are not alphanumeric: cat /bin/bash | grep -c "AWAVAUATSH" has 181 results, and cat /usr/bin/gzip | grep -c "AWAVAUATSH" has 9 results. What are these strings? Interesting question. Since I didn't know the answer, here are the steps I took to figure it out: Where in the file does the string occur? strings -otx /bin/gzip | grep AWAVAUATUSH 35e0 AWAVAUATUSH 69a0 AWAVAUATUSH 7920 AWAVAUATUSH 8900 AWAVAUATUSH 92a0 AWAVAUATUSH

I need to convert some images to binary for OCR. Here are the functions I am using: Mat binarize(Mat & Img, Mat& res, float blocksize, bool inverse) { Img.convertTo(Img,CV_32FC1,1.0/255.0); CalcBlockMeanVariance(Img,res, blocksize, inverse); res=1.0-res; res=Img+res; if (inverse) { cv::threshold(res,res,0.85,1,cv::THRESH_BINARY_INV); } else { cv::threshold(res,res,0.85,1,cv::THRESH_BINARY); } cv::resize(res,res,cv::Size(res.cols/2,res.rows/2)); return res; } Where CalcBlockMeanVariance : void CalcBlockMeanVariance(Mat& Img,Mat& Res,float blockSide, bool inverse) //21 blockSide - the parameter