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Questions tagged [file-processing]

333 questions
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Replacing String placeholders with different characters

I'm in an intro cse class using Java and I have a new homework where I create a Mad Lib game using File Processing. I am wondering what the best approach is to replace a String placeholder with an adjective like "cool" Here is a small portion of my…
Strategiger
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How to process continuously updating file from start of fail? .

1 How to process from start of a continuously updating file( 1 --> infinite) ? 2 tail -f / tail -n10 -f solution is not correct, because it processing the file from end or some n lines form end of file. But i need to process the file from start of…
sasi kiran
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Run - Time Check Failure #2 in C File processing

Run-Time Check Failure #2 - Stack around the variable 'filename' was corrupted. My code works whenever I try to process the first memory location. I can process the .txt file correctly, and I can print it. Nevertheless, when I ask for a second…
Miguel Tovar
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Line/Token based processing (java)

I'm writing a program to read data from files with various sports statistics. Each line has information about a particular game, in say, basketball. If a particular line contains an "@" symbol, it means that one of the teams is playing at home. I'm…
Hector
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Efficient way to group data in a large file using Java

Consider a file of the following format containing n number of records & i number of columns. If data needs to be grouped by the first column, what is the efficient way to process it using Java? Let's say that n = 40 million. The standard way could…
ram
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Trouble reading objects from binary file in Java

I'm trying to read the serialized data from a .dat file into its corresponding java class file. My .readObject() method keeps throwing ClassNotFoundException though. Why cant it read the data from the file? I'm trying to read it into a student class…
ComicalGamer
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File Input cuts off first word

I am writing a program that should be able to take input, create a file, and store that information. I have successfully done that part. The program should also be able to print a previous file to the screen. The problem I get is that it cuts off…
user5336127
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PHP preg_match_all vs custom file search

I need to parse out some strings from two types of files File type one lines with subpattern l('some string') l('some other string', $mod = "anything") File type two lines with subpattern {l s='some string' mod='anything'} {l s='some other string'…
jave.web
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how to process plenty of files by multi-thread in java

Now I have plenty of JSON files on local, I need read these files and transfer them to JSONObject then do some business logical, such as find out the child-node then return, count some special value then return. As the single file, I have finished…
leo
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rsync script expands variable incorrectly

I have a script that takes in a unique location number from a file. These are formatted like this 7325-05, 5269-09 and 7479-14, for example. The first four numbers are what the folder is called and the second number is the first two characters of…
Emil Visti
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delete lines from file in python

I have a file formated like this： #1 0.13297254902 0.324803921569 0.434835294118 ...#many floats in one line #2 0 #3 0.377305882353 0.595870588235 0.353215686275 ... #4 1 #0/1 for the second line #5 .... I want to process the file so that all…
Mandary
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remove line from file if more than one pattern appears in different line

I have a file with a patter like this: 1 1 1 2 0 1 0.5 1 2 2 2 0 2 0.5 2 1 1 1 0 1 0.25 2 1 2 2 0 2 0.5 2 3 3 3 0 3 0.25 I want to remove a line if another line in the file has the same last two entries. In the example above this means that line 4…
Aplln
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File processing using try-catch C++

I'm working on a project about file processing. The users input ID, hours, and payrate. The output will be ID, hours, payrate and grosspay. I got those parts done. I really need help on try and catch, where users input a non-numeric, the project…
Van Le
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How to replace single quote to double quote by awk when under Windows?

I tried gsub() but it didn't work. Here is the command: awk -v a="'" b=" \" " "gsub(a,b,$0){print $0}" D:\re.json or anybody could tell me what is the right escape character in Windows command line?
wanderlustwei
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How to deal with big JSON file in R?

I have a JSON file sizing in 500mb, and need to process it in R using fromJSON. I've tried bigmemory packages but still failed. Either crashed or reached the memory limits. Some code I had used like these raw<-…
wanderlustwei
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