passing 3D arrrays from c++ to fortran and viceversa

N

NM

Hello all,

I am supposed to do some mixed programming with c++ and fortran.
I was succeeful in exchanging the 2D arrays from fortran to c++ and the
other way, but was unable
to that same with the 3D arrays, the values passed are not all the
same. I am also pasting the fortran and c++ codes so that you could
have a look at them.

////C++ Code

#include <math.h>
#include <iostream>
#include <stdlib.h>
#include <time.h>
using namespace std;

extern "C" {
void setup_(int *, int *, int *, int *, int *);
void getsetup_( float *,float *);

}


int main()
{

float **testarr,***arr3d;
int rowfor,colfor,i,j,k=1;
int three,two,one,inc;
setup_(&rowfor,&colfor,&three,&two,&one);

// 2D array dynamical allocation
testarr = new float*[colfor];

for (i=0; i < colfor; i++)
testarr= new float[rowfor];


//3d array dynamic allocation
//cout<<"\nThree = "<<three<<"\tTwo = "<<two<<"\tOne= "<<one;
arr3d = new float**[three];

for (i=0;i<three;i++)
arr3d=new float*[two];

for(i=0;i<three;i++)
for(j=0;j<two;j++)
arr3d[j]=new float[one];


// Assigning values to the 2D array of c++
inc=1;
for(i=0;i<colfor;i++)
for(j=0;j<rowfor;j++)
testarr[j]=inc++;


// Assigning values to the 3D array of c++
inc=1;
for(i=0;i<one;i++)
for(j=0;j<two;j++)
for(k=0;k<three;k++)
arr3d[k][j]=inc++;

//Printing the 2D array in c++ before getsetup
cout<<"\nC++ 2D Array IN C++ BEFORE GETSETUP----------";
for(i=0;i<colfor;i++)
{
cout<<endl;
for(j=0;j<rowfor;j++)
cout<<" "<<testarr[j];

}

//Printing the 3D array in c++ before getsetup
cout<<"\nC++ 3D Array IN C++ BEFORE GETSETUP----------";
for(i=0;i<three;i++)
{
cout<<"\n";
for(j=0;j<two;j++)
{
cout<<"\n";
for(k=0;k<one;k++)
cout<<" "<<arr3d[j][k];
}
}

getsetup_(*testarr,&arr3d[0][0][0]);

//Printing the 2D array in c++ after getsetup
cout<<"\n C++ 2D Array IN C++ AFTER GETSETUP ----------";
for(i=0;i<colfor;i++)
{
cout<<endl;
for(j=0;j<rowfor;j++)
cout<<" "<<testarr[j];
}


//Printing the 3D array in c++ after getsetup
cout<<"\nC++ 3D Array IN C++ BEFORE GETSETUP----------";
for(i=0;i<three;i++)
{
cout<<"\n";
for(j=0;j<two;j++)
{
cout<<"\n";
for(k=0;k<one;k++)
cout<<" "<<arr3d[j][k];
}
}

cout<<"\n";

return 0;

}


!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Fortran Code

module chek
integer rowfor
integer colfor,onefor,twofor,threefor
real*8, allocatable:: arrfor:),:)
real*8, allocatable:: arrfor3d:),:,:)
end module chek

subroutine setup(row, col, three, two, one)
use chek
integer row,col,i,j,k,three,two,one
k=1

rowfor = 3
colfor= 10

three = 4
two = 3
one = 2

allocate(arrfor(rowfor,colfor),stat=ierr)
allocate(arrfor3d(one,two,three),stat=ierr)

! Assinging values to 2D array of Fortran
do i=1,rowfor
do j=1,colfor
arrfor(i,j)= 222
end do
end do

! Assinging values to 3D array of Fortran
do i=1,one
do j=1,two
do k=1,three
arrfor3d(i,j,k)= 333
end do
end do
end do

onefor = one
twofor = two
threefor = three
col=colfor
row=rowfor

end subroutine




subroutine getsetup(arr,arr3d)
use chek
real arr(0:rowfor,0:colfor)
real arr3d(0:eek:nefor,0:twofor,0:threefor)
integer i,j,k

print *,''
print *,'@@@@@ C++ 2D array IN Fortran i.e IN GETSETUP @@@@@@@@@@@@@@'
do i=0,rowfor-1
print *, ' ',(arr(i,j),j=0,colfor-1)
end do


print*,'@@@@@c++ 3D array in fortran in Getsetup@@@@@@@@@@@@@ '
do i=0,onefor-1
do j=0,twofor-1
print *, ' ',(arr3d(i,j,k),k=0,threefor-1)
enddo
enddo

! Assinging values for the 2D array of c++ with 2d array of fortran
do i=0, rowfor-1
do j=0, colfor-1
arr(i,j)=arrfor(i+1,j+1)
end do
end do


! Assinging values to 3D array of c++ withe the 3D array of fortran
do i=1,onefor
do j=1,twofor
do k=1,threefor
arr3d(i-1,j-1,k-1)=arrfor3d(i,j,k)
enddo
enddo
enddo

end subroutine

////////////////////The Output!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
C++ 2D Array IN C++ BEFORE GETSETUP----------
1 2 3
4 5 6
7 8 9
10 11 12
13 14 15
16 17 18
19 20 21
22 23 24
25 26 27
28 29 30
C++ 3D Array IN C++ BEFORE GETSETUP----------

1 13
5 17
9 21

2 14
6 18
10 22

3 15
7 19
11 23

4 16
8 20

@@@@@ C++ 2D array IN Fortran i.e IN GETSETUP @@@@@@@@@@@@@@
1.000000 4.000000 7.000000 10.00000 13.00000 16.00000 19.00000
22.00000 25.00000 28.00000
2.000000 5.000000 8.000000 11.00000 14.00000 17.00000 20.00000
23.00000 26.00000 29.00000
3.000000 6.000000 9.000000 12.00000 15.00000 18.00000 21.00000
24.00000 27.00000 30.00000
@@@@@c++ 3D array in fortran in Getsetup@@@@@@@@@@@@@
1.000000 2.000000 3.000000 4.000000
0.0000000 0.0000000 0.0000000 0.0000000
0.0000000 0.0000000 0.0000000 0.0000000
13.00000 14.00000 15.00000 16.00000
5.000000 6.000000 7.000000 8.000000
0.0000000 0.0000000 0.0000000 0.0000000
12 24
C++ 2D Array IN C++ AFTER GETSETUP ----------
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
C++ 3D Array IN C++ BEFORE GETSETUP----------

333 333
333 17
9 21

333 333
333 18
10 22

333 333
333 19
11 23

333 333
333 20
12 24

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!////////////////////////////////////////

It can be observed that the 2D arrays are working fine, i.e the changes
done in c++ are reflected in fortran and vice versa, but it doesnt seem
to happen with 3D, some values are not changed as expected. I hope I
have made my point clear.
Any suggestions would be of great help
Thanks in advance

Regards,
NM
 
E

E. Robert Tisdale

NM said:
I am supposed to do some mixed [language] programming with C++ and Fortran.
I was successful in exchanging the 2D arrays from Fortran to C++
and the other way but was unable to the same with the 3D arrays.
The values passed are not all the same.
I am also posting the Fortran and C++ codes
so that you could have a look at them.
Click to expand...

Fortran array subscripts appear in order from left to right.
C & C++ array subscripts appear in *reverse* order from right to left.
So Fortran and C arrays appear to be transposes of each other.
For an N-dimensional array:

A[n_N]...[n_2][n_1] ~ A(n_1, n_2, ..., n_N)

Fortran 77/90/95 [sub]programs don't understand pointers to pointers
so you must pass a pointer to the first element of the array

&A[0]...[0][0]

For example:
> cat main.cc
Click to expand...
#include <math.h>
#include <iostream>
#include <stdlib.h>
#include <time.h>

extern "C" {
void setup_(int& rowfor, int& colfor,
int& three, int& two, int& one) {
rowfor = 3; colfor = 10;
three = 4; two = 3; one = 2;
}
void getsetup_(float* testarr, float* arr3d) {
// ?
}
}

int main(int argc, char* argv[]) {

int rowfor, colfor, three, two, one;
setup_(rowfor, colfor, three, two, one);

// 2D array dynamic allocation
// testarr[colfor][rowfor] ~ testarr(rowfor, colfor)
float** testarr = new float*[colfor];

testarr[0] = new float[rowfor*colfor];
for (int j = 1; j < colfor; ++j)
testarr[j] = testarr[j-1] + rowfor;

// 3D array dynamic allocation
// arr3d[three][two][one] ~ arr3d(one, two, three)
float*** arr3d = new float**[three];

arr3d[0] = new float*[three*two];
for (int i = 1; i < three; ++i)
arr3d = arr3d[i-1] + two;

arr3d[0][0] = new float[three*two*one];
for (int j = 1; j < two; ++j)
arr3d[0][j] = arr3d[0][j-1] + one;
for (int i = 1; i < three; ++i) {
arr3d[0] = arr3d[i-1][0] + two*one;
for (int j = 1; j < two; ++j)
arr3d[j] = arr3d[j-1] + one;
}

// Assigning values to the 2D array of C++
int inc = 0;
for (int i = 0; i < colfor; ++i)
for (int j = 0; j < rowfor; ++j)
testarr[j] = ++inc; // testarr(j, i)

// Assigning values to the 3D array of C++
inc = 0;
for (int i = 0; i < three; ++i)
for (int j = 0; j < two; ++j)
for (int k = 0; k < one; ++k)
arr3d[j][k]= ++inc; // arr3d(k, j, i)

//Printing the 2D array in C++ before getsetup
std::cout << "\nC++ 2D Array IN C++ BEFORE GETSETUP --------";
for (int i = 0; i < colfor; ++i) {
std::cout << std::endl;
for (int j = 0; j < rowfor; ++j)
std::cout << " " << testarr[j]; // testarr(j, i)
}

//Printing the 3D array in C++ before getsetup
std::cout << "\nC++ 3D Array IN C++ BEFORE GETSETUP --------";
for (int i = 0; i < three; ++i) {
std::cout << "\n";
for (int j = 0; j < two; ++j) {
std::cout << "\n";
for (int k = 0; k < one; ++k)
std::cout << " " << arr3d[j][k]; // arr3d(k,j,i)
}
}

getsetup_(&testarr[0][0], &arr3d[0][0][0]);

//Printing the 2D array in C++ after getsetup
std::cout << "\nC++ 2D Array IN C++ AFTER GETSETUP --------";
for (int i = 0; i < colfor; ++i) {
std::cout << std::endl;
for (int j = 0; j < rowfor; ++j)
std::cout << " " << testarr[j]; // testarr(j, i)
}

//Printing the 3D array in C++ after getsetup
std::cout << "\nC++ 3D Array IN C++ AFTER GETSETUP --------";
for (int i = 0; i < three; ++i) {
std::cout << "\n";
for (int j = 0; j < two; ++j) {
std::cout << "\n";
for (int k = 0; k < one; ++k)
std::cout << " " << arr3d[j][k]; // arr3d(k,j,i)
}
}

std::cout << "\n";

// Deallocate arrays in *reverse* order!
delete [] arr3d[0][0];
delete [] arr3d[0];
delete [] arr3d;
delete [] testarr[0];
delete [] testarr;

return 0;
}
> g++ -Wall -ansi -pedantic -o main main.cc
> ./main
Click to expand...

C++ 2D Array IN C++ BEFORE GETSETUP ----------
1 2 3
4 5 6
7 8 9
10 11 12
13 14 15
16 17 18
19 20 21
22 23 24
25 26 27
28 29 30
C++ 3D Array IN C++ BEFORE GETSETUP ----------

1 2
3 4
5 6

7 8
9 10
11 12

13 14
15 16
17 18

19 20
21 22
23 24
C++ 2D Array IN C++ AFTER GETSETUP ----------
1 2 3
4 5 6
7 8 9
10 11 12
13 14 15
16 17 18
19 20 21
22 23 24
25 26 27
28 29 30
C++ 3D Array IN C++ AFTER GETSETUP ----------

1 2
3 4
5 6

7 8
9 10
11 12

13 14
15 16
17 18

19 20
21 22
23 24

Of course, Fortran is off-topic in comp.lang.c++.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Fortran Code

module chek
integer rowfor
integer colfor,onefor,twofor,threefor
real*8, allocatable:: arrfor:),:)
real*8, allocatable:: arrfor3d:),:,:)
end module chek

subroutine setup(row, col, three, two, one)
use chek
integer row,col,i,j,k,three,two,one
k=1

rowfor = 3
colfor= 10

three = 4
two = 3
one = 2

allocate(arrfor(rowfor,colfor),stat=ierr)
allocate(arrfor3d(one,two,three),stat=ierr)

! Assinging values to 2D array of Fortran
do i=1,rowfor
do j=1,colfor
arrfor(i,j)= 222
end do
end do

! Assinging values to 3D array of Fortran
do i=1,one
do j=1,two
do k=1,three
arrfor3d(i,j,k)= 333
end do
end do
end do

onefor = one
twofor = two
threefor = three
col=colfor
row=rowfor

end subroutine




subroutine getsetup(arr,arr3d)
use chek
real arr(0:rowfor,0:colfor)
real arr3d(0:eek:nefor,0:twofor,0:threefor)
Click to expand...

Fortran thinks that these arrays
are larger than they actually are.
You need to make up your mind here.
It's either

real arr(0:rowfor-1, 0:colfor-1)
real arr3d(0:eek:nefor-1, 0:twofor-1, 0:threefor-1)

or it's

real arr(1:rowfor, 1:colfor)
real arr3d(1:eek:nefor, 1:twofor, 1:threefor)


You can simply write

arr = arrfor

and

arr3d = arrfor3d

to copy the arrays.
integer i,j,k

print *,''
print *,'@@@@@ C++ 2D array IN Fortran i.e IN GETSETUP @@@@@@@@@@@@@@'
do i=0,rowfor-1
print *, ' ',(arr(i,j),j=0,colfor-1)
end do


print*,'@@@@@c++ 3D array in fortran in Getsetup@@@@@@@@@@@@@ '
do i=0,onefor-1
do j=0,twofor-1
print *, ' ',(arr3d(i,j,k),k=0,threefor-1)
enddo
enddo

! Assinging values for the 2D array of c++ with 2d array of fortran
do i=0, rowfor-1
do j=0, colfor-1
arr(i,j)=arrfor(i+1,j+1)
end do
end do


! Assinging values to 3D array of c++ withe the 3D array of fortran
do i=1,onefor
do j=1,twofor
do k=1,threefor
arr3d(i-1,j-1,k-1)=arrfor3d(i,j,k)
enddo
enddo
enddo

end subroutine

////////////////////The Output!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
C++ 2D Array IN C++ BEFORE GETSETUP----------
1 2 3
4 5 6
7 8 9
10 11 12
13 14 15
16 17 18
19 20 21
22 23 24
25 26 27
28 29 30
C++ 3D Array IN C++ BEFORE GETSETUP----------

1 13
5 17
9 21

2 14
6 18
10 22

3 15
7 19
11 23

4 16
8 20

@@@@@ C++ 2D array IN Fortran i.e IN GETSETUP @@@@@@@@@@@@@@
1.000000 4.000000 7.000000 10.00000 13.00000 16.00000 19.00000
22.00000 25.00000 28.00000
2.000000 5.000000 8.000000 11.00000 14.00000 17.00000 20.00000
23.00000 26.00000 29.00000
3.000000 6.000000 9.000000 12.00000 15.00000 18.00000 21.00000
24.00000 27.00000 30.00000
@@@@@c++ 3D array in fortran in Getsetup@@@@@@@@@@@@@
1.000000 2.000000 3.000000 4.000000
0.0000000 0.0000000 0.0000000 0.0000000
0.0000000 0.0000000 0.0000000 0.0000000
13.00000 14.00000 15.00000 16.00000
5.000000 6.000000 7.000000 8.000000
0.0000000 0.0000000 0.0000000 0.0000000
12 24
C++ 2D Array IN C++ AFTER GETSETUP ----------
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
C++ 3D Array IN C++ BEFORE GETSETUP----------

333 333
333 17
9 21

333 333
333 18
10 22

333 333
333 19
11 23

333 333
333 20
12 24

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!////////////////////////////////////////

It can be observed that the 2D arrays are working fine,
i.e., the changes done in C++ are reflected in Fortran and vice versa
but it doesn't seem to happen with 3D.
Some values are not changed as expected.
I hope [that] I have made my point clear.
Any suggestions would be of great help
Click to expand...
 
N

NM

E. Robert Tisdale said:
NM said:
I am supposed to do some mixed [language] programming with C++ and Fortran.
I was successful in exchanging the 2D arrays from Fortran to C++
and the other way but was unable to the same with the 3D arrays.
The values passed are not all the same.
I am also posting the Fortran and C++ codes
so that you could have a look at them.
Click to expand...

Fortran array subscripts appear in order from left to right.
C & C++ array subscripts appear in *reverse* order from right to left.
So Fortran and C arrays appear to be transposes of each other.
For an N-dimensional array:

A[n_N]...[n_2][n_1] ~ A(n_1, n_2, ..., n_N)

Fortran 77/90/95 [sub]programs don't understand pointers to pointers
so you must pass a pointer to the first element of the array

&A[0]...[0][0]

For example:
cat main.cc
Click to expand...
#include <math.h>
#include <iostream>
#include <stdlib.h>
#include <time.h>

extern "C" {
void setup_(int& rowfor, int& colfor,
int& three, int& two, int& one) {
rowfor = 3; colfor = 10;
three = 4; two = 3; one = 2;
}
void getsetup_(float* testarr, float* arr3d) {
// ?
}
}

int main(int argc, char* argv[]) {

int rowfor, colfor, three, two, one;
setup_(rowfor, colfor, three, two, one);

// 2D array dynamic allocation
// testarr[colfor][rowfor] ~ testarr(rowfor, colfor)
float** testarr = new float*[colfor];

testarr[0] = new float[rowfor*colfor];
for (int j = 1; j < colfor; ++j)
testarr[j] = testarr[j-1] + rowfor;

// 3D array dynamic allocation
// arr3d[three][two][one] ~ arr3d(one, two, three)
float*** arr3d = new float**[three];

arr3d[0] = new float*[three*two];
for (int i = 1; i < three; ++i)
arr3d = arr3d[i-1] + two;

arr3d[0][0] = new float[three*two*one];
for (int j = 1; j < two; ++j)
arr3d[0][j] = arr3d[0][j-1] + one;
for (int i = 1; i < three; ++i) {
arr3d[0] = arr3d[i-1][0] + two*one;
for (int j = 1; j < two; ++j)
arr3d[j] = arr3d[j-1] + one;
}

// Assigning values to the 2D array of C++
int inc = 0;
for (int i = 0; i < colfor; ++i)
for (int j = 0; j < rowfor; ++j)
testarr[j] = ++inc; // testarr(j, i)

// Assigning values to the 3D array of C++
inc = 0;
for (int i = 0; i < three; ++i)
for (int j = 0; j < two; ++j)
for (int k = 0; k < one; ++k)
arr3d[j][k]= ++inc; // arr3d(k, j, i)

//Printing the 2D array in C++ before getsetup
std::cout << "\nC++ 2D Array IN C++ BEFORE GETSETUP --------";
for (int i = 0; i < colfor; ++i) {
std::cout << std::endl;
for (int j = 0; j < rowfor; ++j)
std::cout << " " << testarr[j]; // testarr(j, i)
}

//Printing the 3D array in C++ before getsetup
std::cout << "\nC++ 3D Array IN C++ BEFORE GETSETUP --------";
for (int i = 0; i < three; ++i) {
std::cout << "\n";
for (int j = 0; j < two; ++j) {
std::cout << "\n";
for (int k = 0; k < one; ++k)
std::cout << " " << arr3d[j][k]; // arr3d(k,j,i)
}
}

getsetup_(&testarr[0][0], &arr3d[0][0][0]);

//Printing the 2D array in C++ after getsetup
std::cout << "\nC++ 2D Array IN C++ AFTER GETSETUP --------";
for (int i = 0; i < colfor; ++i) {
std::cout << std::endl;
for (int j = 0; j < rowfor; ++j)
std::cout << " " << testarr[j]; // testarr(j, i)
}

//Printing the 3D array in C++ after getsetup
std::cout << "\nC++ 3D Array IN C++ AFTER GETSETUP --------";
for (int i = 0; i < three; ++i) {
std::cout << "\n";
for (int j = 0; j < two; ++j) {
std::cout << "\n";
for (int k = 0; k < one; ++k)
std::cout << " " << arr3d[j][k]; // arr3d(k,j,i)
}
}

std::cout << "\n";

// Deallocate arrays in *reverse* order!
delete [] arr3d[0][0];
delete [] arr3d[0];
delete [] arr3d;
delete [] testarr[0];
delete [] testarr;

return 0;
}
g++ -Wall -ansi -pedantic -o main main.cc
./main
Click to expand...

C++ 2D Array IN C++ BEFORE GETSETUP ----------
1 2 3
4 5 6
7 8 9
10 11 12
13 14 15
16 17 18
19 20 21
22 23 24
25 26 27
28 29 30
C++ 3D Array IN C++ BEFORE GETSETUP ----------

1 2
3 4
5 6

7 8
9 10
11 12

13 14
15 16
17 18

19 20
21 22
23 24
C++ 2D Array IN C++ AFTER GETSETUP ----------
1 2 3
4 5 6
7 8 9
10 11 12
13 14 15
16 17 18
19 20 21
22 23 24
25 26 27
28 29 30
C++ 3D Array IN C++ AFTER GETSETUP ----------

1 2
3 4
5 6

7 8
9 10
11 12

13 14
15 16
17 18

19 20
21 22
23 24

Of course, Fortran is off-topic in comp.lang.c++.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Fortran Code

module chek
integer rowfor
integer colfor,onefor,twofor,threefor
real*8, allocatable:: arrfor:),:)
real*8, allocatable:: arrfor3d:),:,:)
end module chek

subroutine setup(row, col, three, two, one)
use chek
integer row,col,i,j,k,three,two,one
k=1

rowfor = 3
colfor= 10

three = 4
two = 3
one = 2

allocate(arrfor(rowfor,colfor),stat=ierr)
allocate(arrfor3d(one,two,three),stat=ierr)

! Assinging values to 2D array of Fortran
do i=1,rowfor
do j=1,colfor
arrfor(i,j)= 222
end do
end do

! Assinging values to 3D array of Fortran
do i=1,one
do j=1,two
do k=1,three
arrfor3d(i,j,k)= 333
end do
end do
end do

onefor = one
twofor = two
threefor = three
col=colfor
row=rowfor

end subroutine




subroutine getsetup(arr,arr3d)
use chek
real arr(0:rowfor,0:colfor)
real arr3d(0:eek:nefor,0:twofor,0:threefor)
Click to expand...

Fortran thinks that these arrays
are larger than they actually are.
You need to make up your mind here.
It's either

real arr(0:rowfor-1, 0:colfor-1)
real arr3d(0:eek:nefor-1, 0:twofor-1, 0:threefor-1)

or it's

real arr(1:rowfor, 1:colfor)
real arr3d(1:eek:nefor, 1:twofor, 1:threefor)


You can simply write

arr = arrfor

and

arr3d = arrfor3d

to copy the arrays.
integer i,j,k

print *,''
print *,'@@@@@ C++ 2D array IN Fortran i.e IN GETSETUP @@@@@@@@@@@@@@'
do i=0,rowfor-1
print *, ' ',(arr(i,j),j=0,colfor-1)
end do


print*,'@@@@@c++ 3D array in fortran in Getsetup@@@@@@@@@@@@@ '
do i=0,onefor-1
do j=0,twofor-1
print *, ' ',(arr3d(i,j,k),k=0,threefor-1)
enddo
enddo

! Assinging values for the 2D array of c++ with 2d array of fortran
do i=0, rowfor-1
do j=0, colfor-1
arr(i,j)=arrfor(i+1,j+1)
end do
end do


! Assinging values to 3D array of c++ withe the 3D array of fortran
do i=1,onefor
do j=1,twofor
do k=1,threefor
arr3d(i-1,j-1,k-1)=arrfor3d(i,j,k)
enddo
enddo
enddo

end subroutine

////////////////////The Output!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
C++ 2D Array IN C++ BEFORE GETSETUP----------
1 2 3
4 5 6
7 8 9
10 11 12
13 14 15
16 17 18
19 20 21
22 23 24
25 26 27
28 29 30
C++ 3D Array IN C++ BEFORE GETSETUP----------

1 13
5 17
9 21

2 14
6 18
10 22

3 15
7 19
11 23

4 16
8 20

@@@@@ C++ 2D array IN Fortran i.e IN GETSETUP @@@@@@@@@@@@@@
1.000000 4.000000 7.000000 10.00000 13.00000 16.00000 19.00000
22.00000 25.00000 28.00000
2.000000 5.000000 8.000000 11.00000 14.00000 17.00000 20.00000
23.00000 26.00000 29.00000
3.000000 6.000000 9.000000 12.00000 15.00000 18.00000 21.00000
24.00000 27.00000 30.00000
@@@@@c++ 3D array in fortran in Getsetup@@@@@@@@@@@@@
1.000000 2.000000 3.000000 4.000000
0.0000000 0.0000000 0.0000000 0.0000000
0.0000000 0.0000000 0.0000000 0.0000000
13.00000 14.00000 15.00000 16.00000
5.000000 6.000000 7.000000 8.000000
0.0000000 0.0000000 0.0000000 0.0000000
12 24
C++ 2D Array IN C++ AFTER GETSETUP ----------
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
222 222 222
C++ 3D Array IN C++ BEFORE GETSETUP----------

333 333
333 17
9 21

333 333
333 18
10 22

333 333
333 19
11 23

333 333
333 20
12 24

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!////////////////////////////////////////

It can be observed that the 2D arrays are working fine,
i.e., the changes done in C++ are reflected in Fortran and vice versa
but it doesn't seem to happen with 3D.
Some values are not changed as expected.
I hope [that] I have made my point clear.
Any suggestions would be of great help
Click to expand...
Click to expand...


I was pleased to get a quick reply and
Thanks a lot Robert, I fixed my problemm.
 

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