I am writing matrix multiplication and trying to return a two dimensional array from a function but I keep getting errors. Can someone please help me?
here is my code (it is just the skeleton of my program):
Code:
void main ()
{
...
int *matmultiply (int, int, int, int [] [mat_cols], int [] [vec_cols], int [][vec_cols])
...
}
int *matmultiply (int mat_rows, int mat_cols, int vec_cols, int matrix [] [mat_cols], int vector [] [vec_cols], int result [][vec_cols])
{
for (int i = 0; i < mat_rows; i++)
{
res = 0; //Stores result of multiplication
for (int k = 0; k < vec_cols; k++)
{
int vrows = 0;
for (int j = 0; j < mat_cols; j++)
{
res = res + ((matrix [i] [j]) * (vector [vrows] [k]));
vrows++;
}
result [i] [k]= res;
}
}
return result; //This is the problem
}
//matmultiply performs multiplication and returns the result matrix.
I am trying to reference a two dimensional array in a
subroutine and can't seem to figure this one out in Perl.
Does anybody know? Please enlighten me.
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I have a large size of file, File contains looks like
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Hi.
I have a problem with passing two dimensional array to a function.
First, let me show my code to explain what i am going to do:
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Hello, all
For a 1-dimensional array, such as
myarr_1=1
myarr_1=2
myarr_1=3I know I can write a loop as below to show the array member one by one:
for (i in myarr_1){print i, myarr_1}Now, suppose I have a two dimensional array such as:
myarray_2=1 myarray_2=2
myarray_2=10 myarray_2=20My... (3 Replies)
I have an array of names. Each one of the name, has a number represented to it.
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Hi,
I have a 10*10 two dimensional array. How do I assign value to all it's 100 elements at once? I don't want to open two for loops and assign one by one.
Thanks,
Shuri (1 Reply)
Discussion started by: shurimano
1 Replies
LEARN ABOUT CENTOS
zlacpy.f
zlacpy.f(3) LAPACK zlacpy.f(3)NAME
zlacpy.f -
SYNOPSIS
Functions/Subroutines
subroutine zlacpy (UPLO, M, N, A, LDA, B, LDB)
ZLACPY copies all or part of one two-dimensional array to another.
Function/Subroutine Documentation
subroutine zlacpy (characterUPLO, integerM, integerN, complex*16, dimension( lda, * )A, integerLDA, complex*16, dimension( ldb, * )B,
integerLDB)
ZLACPY copies all or part of one two-dimensional array to another.
Purpose:
ZLACPY copies all or part of a two-dimensional matrix A to another
matrix B.
Parameters:
UPLO
UPLO is CHARACTER*1
Specifies the part of the matrix A to be copied to B.
= 'U': Upper triangular part
= 'L': Lower triangular part
Otherwise: All of the matrix A
M
M is INTEGER
The number of rows of the matrix A. M >= 0.
N
N is INTEGER
The number of columns of the matrix A. N >= 0.
A
A is COMPLEX*16 array, dimension (LDA,N)
The m by n matrix A. If UPLO = 'U', only the upper trapezium
is accessed; if UPLO = 'L', only the lower trapezium is
accessed.
LDA
LDA is INTEGER
The leading dimension of the array A. LDA >= max(1,M).
B
B is COMPLEX*16 array, dimension (LDB,N)
On exit, B = A in the locations specified by UPLO.
LDB
LDB is INTEGER
The leading dimension of the array B. LDB >= max(1,M).
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Definition at line 104 of file zlacpy.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Version 3.4.2 Tue Sep 25 2012 zlacpy.f(3)