Programming :: Double Pointers / Matrix GCC (fill It One Column With Zeros And The Other With Ones)
May 26, 2011
I have a 10x2 matrix, I create said matrix and fill it one column with zeros and the other with ones, now when I print the matrix I get this:
column 1:
0,0,0,0,0,0,0,0,1,1
column 2:
1,1,1,1,1,1,1,1,1,1
The first two rows of the second column are being replaced into the last two rows of the first column, now I even checked in visual studio and it works fine there. A friend tried my code and he gets it even worse:
column 1:
0,0,0,0,1,1,1,1,1,1
column 2:
1,1,1,1,1,1,1,1,1,1
As far as I've seen it must be a problem with GCC, unfortunately I need to have this up and running in GCC no matter what.
[Code].....
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Oct 17, 2010
I was using dd if=/dev/zero of=/dev/user name/wipe.conf however i got a message that my hard drive is full.
lots of this is scary - dangerous. what is the best way to fill in random or zeros in deleted files without the hard drive filling up ?
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Apr 13, 2011
I just can't find... why is my code seg-faulting?
PHP Code:
/*
Code name: Assignment #7.
File name: slice.c
Program name: Matrix multiplication (parallel version).
Version: 1.
[Code]...
Is giving my a seg-fault right at the ending point where I do the final gather from the MASTER processor.
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Jun 24, 2011
I want to add double quotation marks to contents of an column ,the column contains over 7000 cells with content already,so it would be heavy task to add "double quotation marks"one by one.Is there any way to do that quickly on Libre office?
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Jul 15, 2010
I have a multicolumn datas, like
a1 b1 ... f1
a2 b2 ... f2
. . ... .
[code]...
I would like to make a file with all these data in one column, like
a1
a2
.
.
[code]....
Can it be done with awk or some other command? Also, is it possible then do add another column in front of this one with numbers of the lines (for every previous column), like
1 a1
2 a2
. .
. .
[code].....
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Mar 27, 2010
I wonder why arrays in the C programming language are pointers to the first element of the array, not the first element of the array itself?
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Sep 13, 2010
i'm practicing in very basic c programs using the gcc compiler.I found that when i create two variables let's say
Code:
int a,b and Code: a=15;
b=3;
a=b;
b--;
then a equals 2.I thought that this isn't normal in C isn't it?I haven't had the time to read the gcc documentation yet...so i think it has something to do with my compiler's default settings.I use the
Code: gcc filename.c -o filename command to compile
Are all variables defined like pointers?
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Mar 23, 2010
So the place where I'm having a problem is here:
Code:
typedef struct {
void **Mem_Chunk;
[code]...
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Jun 1, 2010
What is the difference between *ptr++ and (*ptr)++. In my opinion the terminology is all over the place so if you could give an example it would be better.
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May 23, 2010
i'm a bit stuck playing with the following class setup for glut. The actual issue is with the function pointers.Basically the following code is the opengl redbook cube example slightly modified.
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Jul 14, 2011
I need to call functions that match an input string (if input str = "func1", call func1), so I have this:
Code:
#include <stdio.h>
#include <string.h>
void function_a(void) { printf("Function A
"); }
[Code].....
In the above example, the functions take no input arguments. Can they take a different number of arguments, for example, function_a(int), function_c(int, int), function_e(int, char, int)? How can I do that?
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Apr 12, 2010
I want to know is there some more efficient way of passing a pointer to a local variable as a parameter to a function in x86 asm? Right now I have to move the base pointer to a temp register, subtract from the register and pass that, like this (assuming a local var at esp-4):
Code:
mov eax, ebp
sub eax, 4
push eax
Is there a better way?
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Feb 18, 2010
I'm trying to figure out how to code for this specific type of instance - I want to use a hash and have the key be a reference to an array, and not use the key in the standard way of it being a scalar. Basically, I have a large output that I need to process line by line, and rather have access to it as an array than a big block in a scalar. For the big block hash as a scalar I would do -
Code:
foreach $CONTROLLER (<CONTROLLER_LIST>) {
$ALL_DISKS{$CONTROLLER} = `ssh -n <commands>`;
}
Now I know I could take the scalar and split it to another array after the fact like -
Code:
@TEMP_HOLD = split (/s+/,$ALL_DISKS{$CONTROLLER});
How would I code it that I would have access to the key information as an array and not a scalar? I know it needs to be a pointer and we're going to have -> in there somewhere, but not sure how to approach it. Some of the documentaiton I've been reading about referencing I've found a little confusing so far, and trying to figure out how to use them in context of what I'm working on.
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Jul 3, 2010
I've seen all three uses:
type * pointer
type *pointer
type* pointer
Are these 3 forms essentially the same, i.e., is the spacing as used here a non-factor when declaring pointers?
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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:
Code:
class testModel : public QAbstractItemModel
{
public:
testModel();
~testModel();
[code]....
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Feb 17, 2011
I have the most strange problem ever in programming. I fork a process into a parent and a child. In every forked process i declare a pointer, malloc and define a different value for every pointer.When i printf the value and the address guess what? They both have the SAME ADDRESS but DIFFERENT values, as assigned..Here's the portion of my code:
pid = fork ();
switch (pid)
{
[code]....
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Mar 20, 2011
i did this code:
reads 1 matrix 2x2 and print!
Code:
# include <stdio.h>
int main()
{
int t, i, M[2][2];
int big[2];
[Code]....
Now i want to create 2 vectors:
1 vector: has the biggest number of every line on the matrix
2 vector: has the lowest number of every column on the matrix
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Jul 31, 2011
Dear Linux/c++/g++ programmers: the run result on my system, ubuntuLinux10.04(kernel2.6.35-25), gcc4.5.2 is not what book predict
source code
http://examples.oreilly.com/9780596007614/
11-28
11-29
11-24
#include "matrix.hpp"
[Code]...
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Apr 30, 2010
I'm writing a command-line flash card program in Python. I've tried many existing applications, but none fit my specialized needs.
All of the words I'd like to study are manually added to a text file (study.txt). Each time the software is loaded, it checks for new words in that file and also compares them to a dictionary (a tab-separated file, dictionary.txt), and adds that to a matrix. The flash cards are thus automatically generated from study.txt and dictionary.txt.
Now, the software must manage lots of information about each word I'd like to study and add new information made while interacting with the program (such as when that word should be studied next).
That seems easy to put into a matrix. But what is the best way to put that information in a place where I can pull it back when I run the software tomorrow? Do I need to save the matrix to a CSV file, then convert the CSV file back to a matrix the next time the application is run?
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Jul 2, 2010
I following structure
typedef struct
{
[code]...
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Dec 17, 2008
How do i fill a file with <n> bytes at a given value ,for example 3?
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Dec 8, 2010
This is one of the strangest problems I've run into while programming. Maybe there's just something wrong with my version of gcc or something.
The main problem comes at this point in the code:
Code:
po = makePoFromScorbotXYZPR(X, Y, Z, P, R);
h = makeHB2GFromPo(po);
printf("%le", *h[1][0]); //##################################### Here it has the right value
printf("%s", "
[Code].....
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May 15, 2010
As you know, in C++ you can use setfill(char c); and setwidth( int length) to fill a line of a character.
It's line making a line of a character for output
Code:
NAME DEPARTMENT LOCATION
==========================================
Pete R&D Chicago
...
==========================================
As you see, a line of a '=' character drawn to output.
I'm wondering, how can I draw this line in C using printf() to format?
( no loop or repetiton )
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Mar 21, 2010
I have around 600 empty text files that I need to add the name of this file as part of the data, I meanfiles from "file1.txt to "file599.txt, all of them empty, and I need to get the name inside the file, so, when I open the file show the name as part the data "file1".these files were created on my web site, I am thinking in a small script in bash
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Feb 5, 2010
I need to control matrix 5x4 keypad, on a processor
i am doing by making one row low at a time, and keeping all other rows high,
by scaning coloums, the corresponding key value becomes low.
my problems is that it is taking much time to respond, like to make gpio
low to high and high to low...
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Jun 6, 2010
In bash I need to use some equivalent of double quotes inside double quotes (or the other way around.)I need to run the following statement to get the output of foo and store it in a variable while passing foo the $file which probably contains spaces.
Code:
variable=$(foo "$file")
The problem is that foo might return an empty string and if it does I need to catch it
[code]...
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Sep 2, 2010
I'm making a multimedia library to speedup vector and matrix computation. But I'm getting a strange error, in this code
[Code]....
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Jan 29, 2011
I have a .txt file with the format
0.01
0.04
0.07
...
0.83
I am wanting to load this into octave and perform operations on the data.
[Code]...
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Dec 8, 2010
i am new to scriptingi have a file : file.dat with following data
Code: STORAGE PERCENTAGE FLAG:
/storage_01 64% 0
/storage_02 17% 1
[code]...
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Jan 13, 2010
Here is the txt file
Code:
I want to use a script to statistic the results like that
I want to know the the same string in the first column and how many different in the second column ?
how awk to write ?
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