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  • Basic C++ code for multiplication of 2 matrix or vectors (C++ beginner)

    - by Ice
    I am a new C++ user and I am also doing a major in Maths so thought I would try implement a simple calculator. I got some code off the internet and now I just need help to multiply elements of 2 matrices or vectors. Matrixf multiply(Matrixf const& left, Matrixf const& right) { // error check if (left.ncols() != right.nrows()) { throw std::runtime_error("Unable to multiply: matrix dimensions not agree."); } /* I have all the other part of the code for matrix*/ /** Now I am not sure how to implement multiplication of vector or matrix.**/ Matrixf ret(1, 1); return ret; }

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  • Same memory space being allocated again & again while using malloc()

    - by shadyabhi
    In each loop iteration, variable j is declared again and again. Then why is its address remaining same? Shouldn't it be given some random address each time? Is this compiler dependent? #include<stdio.h> #include<malloc.h> int main() { int i=3; while (i--) { int j; printf("%p\n", &j); } return 0; } Testrun:- shadyabhi@shadyabhi-desktop:~/c$ gcc test.c shadyabhi@shadyabhi-desktop:~/c$ ./a.out 0x7fffc0b8e138 0x7fffc0b8e138 0x7fffc0b8e138 shadyabhi@shadyabhi-desktop:~/c$

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  • zipping a file used by a process

    - by jaganath
    i accidently zipped a log file of process (the process wasnt writing in it though, it writes it only during weekends when the process get killed).I unzipped the file immediately back. will it affect the process when it is trying to write in the log file?

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  • how to send text to a process in a shell script?

    - by Martin
    So I have a Linux program that runs in a while(true) loop, which waits for user input, process it and print result to stdout. I want to write a shell script that open this program, feed it lines from a txt file, one line at a time and save the program output for each line to a file. So I want to know if there is any command for: - open a program - send text to a process - receive output from that program Many thanks.

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  • Format a timestamp into text

    - by user1257114
    I want to get the Modify date of a file and then format it into a human readable date. I am running a C program that gets information on when a particular file was last modified. My C Code contains a sytem cmd which contains a number of egreps, awks, seds separated by pipes. Using sed or awk or something similar, how can I convert 06 to June (This can be any month so an array or something is required) What I am trying to achieve is to end up with a string similar to: My C code contains: char string1[100] = ""; #define MAXCHAR 100 FILE *fp; char str[MAXCHAR], str2[MAXCHAR]; char* filename = "newfile"; /* stat: run 'stat' on the dtlName file to display status information. egrep: search for the pattern 'Modify' and print the lines containing it. awk: Get columns 2 & 3 sed: replace the . with a space, leaving 3 columns of output awk: only print cols 1 & 2 to newfile sed: replace '-' with ' ' in newfile awk: format output in newfile */ sprintf(string1, "/bin/stat %s \ | egrep Modify \ | /bin/awk '{print $2, $3}' \ | /bin/sed 's/\\./ /g' \ | /bin/awk '{print $1, $2}' \ | /bin/sed 's/-/ /g' \ | /bin/awk '{print $3,$2\", \"$1,\"at\",$4}' > newfile" , dtlName); system(string1); fp = fopen(filename, "r"); while (fgets(str, MAXCHAR, fp) != NULL) sprintf(str2,"%s", str); /* Write information to file */ DisplayReportFile (report); ReportEntry (report,L"Source file: %s, Created: %s\n\n",dtlName,str2);

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  • Basic PHP logic problem

    - by Joe Smalley
    $this->totplpremium is 2400 $this->minpremiumq is 800 So why would this ever return true?! if ($this->totplpremium < $this->minpremiumq){ The figures are definitely correct and I am definitely using the 'less than' symbol. I can't work it out.

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  • Visual Basic Display Square

    - by user1724157
    Alright I'm currently lost on a particular assignment I have for a class. I've seen many examples of this app but none of them see to help my problem is as follows: Write a Sub procedure "DisplaySquare" to display the solid square. The size should be specified by the integer parameter "size". The character that fills the square should be specified by the string parameter "fillCharacter. Use a For...Next statement nested within another For...Next statement to create the square. The outer For...Next specifies what row is currently being displayed. The inner For...Next appends all the characters that form the row to a display string. So it should come out like as follows: if a user enters "8" and "#" ######## ######## ######## ######## ######## ######## ######## ######## Any help would be appreciated.

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  • Basic CSS question regarding background images for divs

    - by Mike
    I'm a programmer trying to learn some css and I've already run into a stumbling block. I have the following HTML: <div class="container"> <div class="span-24 last"> Header </div> <div class="span-4"> Left sidebar </div> <div class="span-16"> <div class="span-8"> Box1 </div> <div class="span-4"> Box2 </div> <div class="span-4 last"> Box3 </div> <div class="span-16 last"> Main content </div> </div> <div class="span-4 last"> Right sidebar </div> <div class="span-24 last"> Footer </div> </div> In my css I have the following: body { background-color:#FFFFFF; } div.container { background:url(/images/bck.jpg); } I just want to display an image for the background area for the container div but nothing shows up. If I remove the background section from the css and add background-color:#000000; then I see a black background for the container div. What am I overlooking?

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  • Debugging errors in c++

    - by user1513323
    I was working on a program that printed out the word count, character count and line count depending on the user's input. But I keep getting these error that are completely unknown to me. I was wondering if anyone could help. ** I've changed it from previous mistakes and am still receiving errors. Sorry I'm new to C++. The errors I got were filestat.cpp:47: error: ‘line’ was not declared in this scope filestat.cpp: In function ‘int wc(std::string)’: filestat.cpp:55: error: ‘line’ was not declared in this scope filestat.cpp: In function ‘int cc(std::string)’: filestat.cpp:67: error: ‘line’ was not declared in this scope #include<iostream> #include<fstream> #include<string> using namespace std; int lc(string fname); int wc(string fname); int cc(string fname); int main(){ string fname,line,command; ifstream ifs; int i; while(true){ cout<<"---- Enter a file name : "; if(getline(cin,line)){ if(line.length()== 4 && line.compare("exit")== 0){ cout<<"Exiting"; exit(0); }else{ string command = line.substr(0,2); fname= line.substr(4, line.length() -5); if( ifs.fail()){ ifs.open(fname.c_str()); cerr<< "File not found" <<fname <<endl; ifs.clear(); }else{ if(command.compare("lc")){ lc(fname); }else if (command.compare("wc")){ wc(fname); }else if(command.compare("cc")){ cc(fname); }else cout<<"Command unknown. "; } } } } return 0; } int lc(string fname){ int count; while(getline(fname, line)){ count++; } cout<<"Number of lines: "<<count ; } int wc(string fname){ int count; while(getline(fname, line)){ int pos=line.find_first_of("\n\t ",0); while(pos =! string::npos){ int length=line.length(); line = line.substr(pos+1, length - pos); count++; } } cout<< "Number of words: " <<count; } int cc(string fname){ int count; while(getline(fname, line)){ count = count + line.length(); } cout<< "Number of words: " <<count; }

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  • Same memory space being allocated again & again

    - by shadyabhi
    In each loop iteration, variable j is declared again and again. Then why is its address remaining same? Shouldn't it be given some random address each time? Is this compiler dependent? #include<stdio.h> #include<malloc.h> int main() { int i=3; while (i--) { int j; printf("%p\n", &j); } return 0; } Testrun:- shadyabhi@shadyabhi-desktop:~/c$ gcc test.c shadyabhi@shadyabhi-desktop:~/c$ ./a.out 0x7fffc0b8e138 0x7fffc0b8e138 0x7fffc0b8e138 shadyabhi@shadyabhi-desktop:~/c$

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  • Basic Java question?

    - by LAT
    Hi I am quite new to programming, i have a question please help me. ( this question is java question but i can't remember the syntax but what i write here is mostly it.) A class Person speaks i am a person A class Student speaks i am a student Student extends from Person Person p = new Student then what is p speaking then?

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  • Moq basic questions

    - by devoured elysium
    I made the following test for my class: var mock = new Mock<IRandomNumberGenerator>(); mock.Setup(framework => framework.Generate(0, 50)) .Returns(7.0); var rnac = new RandomNumberAverageCounter(mock.Object, 1, 100); rnac.Run(); double result = rnac.GetAverage(); Assert.AreEqual(result, 7.0, 0.1); The problem here was that I changed my mind about what range of values Generate(int min, int max) would use. So in Mock.Setup() I defined the range as from 0 to 50 while later I actually called the Generate() method with a range from 1 to 100. I ran the test and it failed. I know that that is what it's supposed to happen but I was left wondering if isn't there a way to launch an exception or throw in a message when trying to run the method with wrong params. Also, if I want to run this Generate() method 10 times with different values (let's say, from 1 to 10), will I have to make 10 mock setups or something, or is there a special method for it? The best I could think of is this (which isn't bad, I'm just asking if there is other better way): for (int i = 1; i < 10; ++i) { mock.Setup(framework => framework.Generate(1, 100)) .Returns((double)i); }

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  • Symlinking folders in bash

    - by user343223
    I want a folder /public_html to symlink to /current/app/webroot, both are in the same directory I have tried ln -s public_html current/app/webroot amongst other things, but no joy so far. Any ideas?

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  • Basic iphone timer example

    - by Rob
    Okay, I have searched online and even looked in a couple of books for the answer because I can't understand the apple documentation for the NSTimer. I am trying to implement 2 timers on the same view that each have 3 buttons (START - STOP - RESET). The first timer counts down from 2 minutes and then beeps. The second timer counts up from 00:00 indefinitely. I am assuming that all of the code will be written in the methods behind the 3 different buttons but I am completely lost trying to read the apple documentation. Any help would be greatly appreciated.

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  • C Allocating Two Dimensional Arrays

    - by Jacob
    I am trying to allocate a 2D dimension array of File Descriptors... So I would need something like this fd[0][0] fd[0][1] I have coded so far: void allocateMemory(int row, int col, int ***myPipes){ int i = 0,i2 = 0; myPipes = (int**)malloc(row * sizeof(int*)); for(i = 0; i < row;i++){ myPipes[i] = (int*)malloc(col * sizeof(int)); } } How can I set it all too zeros right now I keep getting a seg fault when I try to assign a value... Thanks

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  • php strtotime() some help

    - by sea_1987
    Hi there, I am taking credit card details and I am taking the expiration date in two form field, one for the expiration month and one for the expiration year, I am wanting to store the expiration date as timestamp. Will strtotime("05/2010") create a time stamp or do I need to pass a day as well or is there an alternative? Thanks

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