Programming :: Define A Structure Node In Graph?

Oct 27, 2010

I wanted to implement a graph.By graph I mean to say that I am writing programs for BFS,DFS and other such stuff and want to see them in action. For this I started writing a program.The first entry point is to define a graph. I took a pen and paper and made a graph. Now to be able to code this in C.I defined a structure but I am finding problem in defining this structure. I looked into Google and came across incidence list and adjacency list representation [URL] after understanding that I am not able to understand how do I define my structure that would be a node in graph. Here is what my graph looks like


| |
| 2---4---6---8
| |


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Programming :: KSH Script Behaving Differently On An HACMP Cluster Node (prod) & A Single Node (UAT)?

Dec 16, 2010

I have created a simple menu driven script for our Operations to take care of the basic monitoring and managing of our production application from the back-end. Now, the script when tested in UAT environment was fine, but when deployed to production it kind of behaved oddly.hen the Operator chooses an option from the menu he is given the output and at the end is prompted to return to the main menu by using ctrl+c. In production, this return does not occur for some strange reason and the program just sits there.The session becomes unresponsive after that and I'm forced to terminated it by closing the PuTTY.I tried enabling the debug mode too (set -x) and still was not able to find any useful hints/trails as to why.

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Programming :: Making A Graph In C

Dec 1, 2010

I am trying to understand how can I make a graph in C. So I wrote some program.

#include "declarations.h"
graph root = NULL;
int main()


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Programming :: Create Graph In Gnuplot ?

Jan 3, 2010

I need a script that takes data fom a file mydata.dat and create a graph. the content of mydata.dat is Bin Data1 Data2 Data3

Then it asks from the user to select which colums with use for x and which for y. the x and y titles must be generated automaticly by the names of each column from the first line of mydata.dat the limits must also be auto generated by the width of the column (for example for data2 is 12-45). in the end for graph title must shown the current time and date in this format:

So it asks for the user the columns and in the end it shows the graph with the above settings.

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Programming :: Define All Variables In Tcl Programming In A File For Instance Var.cfg?

Apr 27, 2010

I can define all variables in tcl programming in a file for instance var.cfgand source the same file in my tcl script such assource var.cfgIs this possible in perl too?

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Programming :: Build A 2D Graph In Java As A Picture?

Feb 3, 2011

I am trying to build a 2D plot for my data and I have the code for it. However, I want to save it as a jpg/png file so that I can have a link to it for my webpage. Below is the code:


import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import javax.swing.*;


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Programming :: Gnuplot Graph Using Trace File

May 1, 2011

How to plot graphs for trace files generated in ns2 using xgraph and gnuplot.

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General :: Make A DRBD Node Start Itself As A Primary Node Automatically?

Jan 28, 2010

I've set up DRBD on 2 machines, 1 of them is the master, another is the slave.

After each bootup, I need to run the following on the master machine:

drbdadm -- --overwrite-data-of-peer primary all

Do we need to specify which machine should be the primary node every time? Is there any method to make the machine "know" it's itself the primary node?

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Programming :: Graph Creation Software (Graphviz / NetworkX)?

Apr 15, 2011

I am going to be creating some graph representations of neural networks for my thesis. I am trying to find a good method for drawing them, preferably in a scripting manner. I like NetworkX since I know python, but am also curious about GraphViz (though the documentation is sparse) or any other solutions anyone may know of. It is important that there is a decent ability to interface with LaTeX.

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CentOS 5 Networking :: Setup The Cluster To Automatically Failover The Service To Another Node Case One Node Fails?

Mar 1, 2011

I am familiar with windows 2008 cluster servers, and I just started testing with centos cluster. I am creating a simple 2-node cluster, for a simple ping test.

Node 1:
Node 2:
Virtual ip:

So far, I can ping a virtual ip, and manually relocate it between the nodes, but I didn't figure out, how to do this automatically. So this is my question: How can I setup the cluster, to it automatically failover the a service to another node case one node fails?

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Programming :: Utility That Draw The Graph Or Flow Chart Of An Application?

Oct 28, 2010

Does any one know any software or utility that draw the graph or flow chart of an application (if application code is on multiple files)?

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Server :: Node Failover And Another Node Take Over Resources On HA Cluster?

Oct 27, 2010

I don't have much experience in clustering. And I'm deploying a cluster system on CentOS.But I don't know how long a node failover and another node take over those resouces to continue running service is good, fast or slow? 1s, 10s or

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Programming :: C Define Char* Array With Calloc?

Mar 6, 2011

This works for "char" but i need "char*",how do I do it?


char* tk = (char*) calloc(ctk+1,sizeof(char*));

Error when I use it:


error: invalid conversion from har* to har

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Programming :: How To Pull Node Pointers Out Of The Model

Mar 25, 2010

I am trying to find a way to pull Node Pointers out of the model, for use in other areas of the program. The solution is probably simple but I haven't had any luck finding it.

Model for a QTreeView:


class testModel : public QAbstractItemModel


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Programming :: Define A Static Member In A Template Class?

Oct 6, 2009

i have trouble to define a static member in a template, and i search from google, but didn't find any similar case, my case is a little complex, i paste the code below.code in xxx.h

template <class T> class FreeListManager


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Programming :: BASH: Read + Define + Modify A Numeric Value From/to A File?

Mar 25, 2010

I want my bash file to read from "input.dat" the two values emin emax. My input file looks like that:

#cat input.dat
emin 10.00 !minimum energy
emax 30.00 !maximum energy

Now this seems to be not so hard with the command awk

awk '{FS=" "}/emin/{print $2}' input.dat
awk '{FS=" "}/emax/{print $2}' input.dat


So far so good. Now, I want to define two variables (e.g. e1,e2) in the bash file, so that their values would correspond to 00.00 and 30.00, as read from the input file. This one I have not found yet, thus asking for your advice. At the end, writing echo $e1 $e2, I should get 10.00 30.00 This is even harder to me: I want to replace the values emin,emax in a new file "modify.dat" which looks like that:

c---- energy interval
emin = 1.00
emax = 2.00

with the values e1 and e2 I have in my bash file. In other words, I want to call "modify.dat", find these two lines and replace the numeric values with the e1 and e2. At the end, my file should be like:

c---- energy interval
emin = 10.00
emax = 30.00

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Programming :: C - How To Malloc For A Structure

Mar 7, 2010

How do you malloc a struct in C? I have a structure of the form:

typedef struct child_req_to_parent


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Programming :: Initializing A Structure To Zero?

Nov 20, 2009

I have a struct (small instance so not using code brackets )

struct random {
int a;
int b;

What i am trying is


and it gives an error how to initialize all the entries within a struct to zero? In the above example i have used integers but what if they are some other data structure for example another structure?

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Programming :: Structure Of PCI ID Not Clear?

Nov 2, 2010

I am learning Kernel Programming these days I came across a structure

static DEFINE_PCI_DEVICE_TABLE(rtl8139_pci_tbl) = {
{0x10ec, 0x8139, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
{0x10ec, 0x8138, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
{0x1113, 0x1211, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
{0x1500, 0x1360, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },


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Programming :: Structure Of The Main Function In C?

Sep 22, 2010

I have started learning C and am following Ivor Horton's "Beginning C - From Novice to Professional". I've noticed that in the book the structure of the main function is:

int main (void) however on the internet I found a lot of cases: void main (void)Which one is preferred and why?

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Programming :: Access In-memory Structure And Its Members?

Dec 13, 2010

I am implementing c program to access ext3 file system's metadata. I want to know how to access members of the in-memory superblock structure. I am able access on-disk ext3_super_block structure but dont know how to access in- memory structure and its members.

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Programming :: Data Structure To Manage Memory?

Oct 1, 2010

I have a mxn matric (which is my simplified way of saying it is RAM with bytes on it) Some of the locations on this metric is filled with some data and some places are empty. The mxn are very big numbers in size. I am trying to make a program so that if a system call wants to write some thing on empty locations on this mxn metric it should be able to do so without any problem. The thing which I want to understand or logic of a data structure is what data structure do you people feel should I be maintaining so that I can allocate the requested space immediately from the above mxn matric when some system call requests for some (k) number of locations from above metrics.

The logic initially I thought was to maintain a hashtable

1bytes requested----------> location 1,location 2,location 3.........location n
2bytes requested----------> location 1,location 2,location 3.........location n
3bytes requested----------> location 1,location 2,location 3.........location n


but the problem with above logic is size of the pointers where I will be writing this problem is unsigned 64 byte.So to know location of one free byte if I am maintaining one pointer of type u64 this is not a feasible solution.

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Programming :: Structure Pointing To Character Array

Aug 9, 2010

I am currently writing a program using raw sockets. This program is used to send out ARP reply frames. The problem that I have is that I do not seem to be able to fill out a structure that is pointing to part of a character array.

struct eth_header *eth;
struct arp_header *arp;
char buf[8];
eth = (struct eth_header *)buf;
arp = (struct arp_header *)(buf+sizeof(struct arp_header));

Whilst I can fill out the variables of eth, I cannot fill out the variables of arp. If I fill them out and then send the contents of the array using send to, only the first structure (the ethernet header) is sent out. The rest of the data appears to be the original junk data in the array. I have checked the address of the structure pointer and it is pointing to the right place in the array. If I write a raw sockets program that uses an IP header struct and TCP header struct I can point these into the array and write to both of them without any issues.

The difference here is that the call to socket is different:
/* For ethernet */
fd = socket(AF_INET, SOCK_PACKET, htons(ETH_P_ARP));
/* For IP */

If I just create one structure containing all of the variables needed this gets around the issue, however, I would like to know what I am doing wrong in the first instance.

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Programming :: Getting Error While Accessing Inode Structure Member / Why Is This?

Dec 16, 2010

I have added new member "i_mymember" to inode on-disk structure in ext3_fs.h file and tried to access this in userspace program, but gives me error that "error: �struct ext3_inode� has no member named �i_mymember� "

I have compiled my kernel source code.

why this error is coming ...?

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Programming :: Data Structure For Implementing A Text Editor?

Nov 15, 2010

Options:A double linked list with fixed size character arrays. New nodes will be added when previous ones get filled. Dynamic arrays using realloc(). Linked list has the disadvantage of not having an O(1) search like an array but I think using realloc() will be more dangerous since it moves the whole block to a new location and if the new location is not big enough to hold the whole block, realloc fails !! this case will not occur with the linked list since its nodes are scattered.

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Programming :: C++ - Store A Text File In A Data Structure?

May 25, 2009

I am writting a program that reads a text file (music.txt) & stores it in a Data Structure. I am a novice learning over the internet so I this is something I have never done. How do I do this?


Write a program that reads the data from the music.txt file and store it in a data structure. To implement this data structure you must use an array of songs and each song must be represented by a struct with appropriate fields. So far all I can do is open to file to read it (very simple I know) but so far is it correct?


#include <iostream>
#include <fstream>
#include <strstream>


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Programming :: Ctime() On Ut_tv.tv_sec Of Utmp Structure?

Jul 30, 2010

I'm using ubuntu9.10 (x86_64) and have some code,

void show_utmp(struct utmp* ent)
time_t tmp;
if (ent->ut_type != USER_PROCESS)


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Programming :: Disable Structure Alignment Using Gcc Compiler Options?

Jan 25, 2010

How can I disable structure alignment feature of gcc using command-line options ?I recently migrated to 64-bit OS, and doubt that I might be experiencing a structure alignment problem due to the new 64-bit architecture.I checked the sizes of the same C-style struct in both x86 and x86_64, and found out that they appear to be different by 20 bytes.I am not sure if this is due to structure alignment or the differences in data type lengths between two platforms.Hence, I will first disable the structure alignment feature, and then check the struct sizes again.

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Programming :: Macro To Access Kernel Objectys Structure?

Jan 29, 2011

telling the exact macro name and location, by which I can gain control over the following kernel base level structure

1. strct super_block of Virtual File System, for super block object.
2. strct inode for inode ofject of VFS.
3 file structure for file object of VFS.

in addition to these if you know location to access other kernel structure.Please let me know.My main objective is to get the access to the structure pointer of these structure by which i can have access over the individual fields o these structure.

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Programming :: Compiling Recursive Makefile In Directory Structure

May 18, 2011

I'm having problems with compiling recursive Makefiles in my directory structure:
My folder layout is:
top/|- one/|- one.c (With main function)|- zero.c|- two/|- two.cin my top folder the make file looks like:

.PHONY: all

@echo $@
$(MAKE) --directory=$@
in my one and two folder I have the following Makefile:

.PHONE: all
@echo $@
$(CC) $(CFLAGS) *.c
But when I compile it from top folder: make

I get following output:
Which states that directory statement by echo in main Makefile is ok but the files are not compiled in one and two.

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