fread | 易学教程

Read multiple csv files in several directories in r

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问题 I want to read multiple .csv files from differents directories then put it in a single dataframe. I have two kinds of directories to read: E:/R_Process/R_Input_UDM/Greater Europe/CEW Hub/Austria/Ap deo/Variant/Ap_deo_1.csv E:/R_Process/R_Input_UDM/Greater Europe/CEW Hub/Austria/Ap deo/Variant/Ap_deo_2.csv E:/R_Process/R_Input_UDM/Greater Europe/CEW Hub/Austria/Bar soap/Variant/Bar_soap_1.csv E:/R_Process/R_Input_UDM/Greater Europe/CEW Hub/Austria/Bar soap/Variant/Bar_soap_2.csv E:/R_Process/R

Reading and writing 64bits by 64 bits in C

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问题 I have this super simple code where I read blocks of 8 bytes (I will encrypt them later in the code) and then write them down in a new file. It works well but for the last 8 bytes which don't get written. Any idea why? #include <stdbool.h> #include <stdlib.h> #include <stdio.h> #include <stdint.h> int main() { uint64_t data; FILE *input, *output; // create output file output = fopen("output.txt", "w"); // read file input = fopen("test.txt", "rb"); if(input) { while(fread(&data, 8, 1, input) =

Read through a file, and add numbers to array parts

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问题 I have a CSV file with thousands of numbers underneath each other. Let's simplify by using this: 4 7 1 9 3 3 8 6 2 What I want is to output an array with 3 numbers per key (imploded by a comma): array ( [0] => 4,7,1 [1] => 9,3,3 [2] => 8,6,2 ) I've managed to get to this, reading the CSV: $path = "data.csv"; $row = 1; if (($handle = fopen($path, "r")) !== FALSE) { while (($data = fgetcsv($handle, 1000, "\r\n")) !== FALSE) { $cell = 0; $table[$row][$cell] = $data[0]; $cell++; } fclose($handle)

PHP fread() Function Returning Extra Characters at the Front on UTF-8 Text Files

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问题 While I'm using fread() on a normal text file (for example: ANSI file saved normally with Notepad), the returned content string is correct, as everyone knows. But when I read the UTF-8 text file, the returning content string contains invisible characters (at the front). Why I said invisible is that the extra characters can't be seen normally on output (e.g.. echo for just read). But when the content string is used for processing (for example: Build a link with href value), problem is arisen

fread skip and autostart issue

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问题 I have the following code: raw_test <- fread("avito_test.tsv", nrows = intNrows, skip = intSkip) Which produces the following error: Error in fread("avito_test.tsv", nrows = intNrows, skip = intSkip, autostart = (intSkip + : Expected sep (',') but new line, EOF (or other non printing character) ends field 14 on line 1003 when detecting types: 10066652 Ð¢Ñ€Ð°Ð½ÑÐ¿Ð¾Ñ€Ñ‚ ÐÐ²Ñ‚Ð¾Ð¼Ð¾Ð±Ð¸Ð»Ð¸ Ñ Ð¿Ñ€Ð¾Ð±ÐµÐ³Ð¾Ð¼ Nissan R Nessa, 1998 Ð¢Ð°Ñ€Ð°Ð½Ñ‚Ð°Ñ Ð² Ð¾Ñ‚Ð»Ð¸Ñ‡Ð½Ð¾Ð¼ ÑÐ¾ÑÑ‚Ð¾ÑÐ½Ð¸Ð¸. Ð½Ð° Ð¿Ñ

PHP压缩与解压Zip(PHPZip类)

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<?php class PHPZip { private $ctrl_dir = array (); private $datasec = array (); /********************************************************** * 压缩部分 **********************************************************/ // ------------------------------------------------------ // // #遍历指定文件夹 // // $archive = new PHPZip(); // $filelist = $archive->visitFile(文件夹路径); // print "当前文件夹的文件:<p>\r\n"; // foreach($filelist as $file) // printf("%s<br>\r\n", $file); // ------------------------------------------------------ // var $fileList = array (); public function visitFile( $path ) { global $fileList ; $path = str

PHP SOAP fread() dynamic POST size

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问题 Looking to read the file size of the SOAP POST, any best practices? $data = fopen('php://input','rb'); $content = fread($data,5000); $dom = new DOMDocument(); $dom->loadXML($content); Would like the 5000 to be dynamic as each SOAP POST size will be different or does this matter? Using fread() would be great 回答1: Umm. If you can read it with ' fread ', I see no reason you cannot read EXACT same text with ' file_get_contents() '. I use this a few times and remembering that I've try both. As far

question with fread and fwrite in C

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问题 the following is my code to write some hardcoded int values(1,2,3,4,5) into a file, close that file, open the same file in read mode and read the elements written. The fwrite happens properly as seen from the output but the fread does not read correctly. #include<stdio.h> int main() { FILE *fptr; FILE *optr; const char *filepath = "E:\\testinput.txt"; int buf[5]={1,2,3,4,5}; int obuf[5]; int value; int *ptr = &value; int num_bytes_read; int no_of_iterations; int i; int ret;//return value for

Why is fread() stopping at a string of 0s?

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问题 I am trying to read a binary file with the following binary configuration 00 00 00 1A 79 20 83 DB 44 ... using the following function static BitArray getBitArray(string filename) { FILE *fs = fopen(filename.data(),"r"); fseek (fs , 0 , SEEK_END); unsigned long s = ftell (fs); rewind (fs); unsigned char *buffer = new unsigned char[s+1]; fread(buffer,1,s,fs); BitArray bArray; for(int i=0; i<s; i++) bArray.add(buffer[i]); delete[] buffer; fclose(fs); return bArray; } where BitArray is just my

fread ignores sep and dec when reading from weblink

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问题 I have a weblink to get some test data which is in the form of a .csv file (European). I've tried using the following command: dat <- fread(file_link, sep = ";", dec = ",") Where file_link is the weblink - since it can not be accessed from outside the private network, here is a sample https://drive.google.com/file/d/0BwghuckSBss7ZmtEMXBYMGNSOWs/view?usp=sharing The data.tables shows the different observations as chr : > str(dat) Classes ‘data.table’ and 'data.frame': 377 obs. of 7 variables: