All Questions
72 questions
4
votes
0
answers
80
views
16x16 integer matrix transpose using SSE2 intrinsics in C
I was inspired by this and this to make a C function that would take an array of 16 __m128i, treat it as a matrix of 16x16 ...
- 171
3
votes
3
answers
495
views
Matrix Multiplication & Addition
I created this small library to perform basic arithmetic on matrices. I have written the code, and it runs fine. Is there any unexpected behavior or memory leaks? Any room for improvement?
...
- 103
2
votes
1
answer
110
views
Transpose matrix in ANSI C
Is there a way to transpose a matrix in ANSI C way much better than this ANSI C code?
Can I do transpose in a different and ...
- 183
3
votes
1
answer
601
views
Matrix-vector multiplication with block-column distribution and MPI_Reduce_scatter
I'm studying MPI and I'm trying to solve the exercise (number 3.5) taken from Pacheco's book Introduction to parallel programming. Essentially the exercise is:
Write an MPI program that computes the ...
- 227
2
votes
1
answer
137
views
Matrix led 7x10 with arduino
Good afternoon, a few days ago I finished a personal project of a 7x10 led matrix programmed with the ATMEGA328p microcontroller. To control the matrix I use 2 74HC595 shift registers in cascade in ...
- 103
4
votes
1
answer
435
views
Need for matrix multiplication speed
I need help to make matrix multiplication in C run as fast as
possible. On my AMD Phenom(tm) II X6 1090T, my program multiplies two
square singe precision 4096x4096 matrices in about 6.9
seconds. ...
- 1,394
1
vote
1
answer
143
views
multiply matrices
I wrote a program that calculates the multiplication of two matrices (of compatible dimensions) where each element of the resulting matrix is calculated by a separate thread. Each thread calculates ...
- 499
4
votes
2
answers
206
views
Two-dimensional arrays in C
The concrete purpose is transferring a string array to a matrix of coefficients and the solving it as a linear system of equations.
I have a bit of trouble with two-dimensional arrays in C. I want to ...
- 41
3
votes
3
answers
192
views
C string parser criticism
I have written a program to parse a string depending on the string the user provides.
Any advise/criticism is appreciated.
...
- 419
0
votes
2
answers
444
views
Matrix Calculator program in C language. How to avoid redundancy [closed]
I am trying to make a program for matrix Calculator and have done this so far. I want to avoid iteration or replication of the statements in my code but I want to restrict using the pointers in this. ...
1
vote
2
answers
275
views
Recursive Matrix Multiplication Algorithm
Can I improve on this any further. Is there a prettier way of passing the array sizes?
...
3
votes
1
answer
105
views
Print out symmetric matrix from compactly stored array
I have an array of the form (3x3 case as an example)
$$A = [a_{11}, a_{12}, a_{22}, a_{13}, a_{23}, a_{33}] $$
corresponding to the symmetric matrix
$$\begin{pmatrix} a_{11} & a_{12} & a_{13}\\...
- 153
3
votes
2
answers
171
views
C program that dynamically allocates and fills 2 matrices, verifies if the smaller one is a subset of the other, and checks a condition
Yesterday, I asked this question because I was asked to implement a software that used variably sized matrices with C89's limitation, so I had to practise dynamic pointer-to-pointer allocation. After ...
- 263
3
votes
3
answers
348
views
5
votes
1
answer
90
views
Striping a matrix concentrically, anticlockwise
Given a matrix you shall stripe the matrix, such that every number that has equal distance to the matrix border will be filled into an array.
For examples see code comments.
...
- 605