gfortran - 2D array concatenation in fortran -

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fortran 2003 has square bracket syntax array concatenation, intel fortran compiler supports too. wrote simple code here matrix concatenation:

program matrix implicit none real,dimension (3,3) :: mat1,mat2 real,dimension(3,6):: mat3 integer  mat1=reshape( (/1,2,3,4,5,6,7,8,9/),(/3,3/)) mat2=reshape( (/1,2,3,4,5,6,7,8,9/),(/3,3/)) mat3=[mat1,mat2]  !display i=1,3,1 write(*,10) mat3(i,:) 10 format(f10.4) end  end program

but error 

mat3=[mat1,mat2] error: incompatible ranks 2 , 1 in assignment

i expect output as

1 2 3 1 2 3 4 5 6 4 5 6 7 8 9 7 8 9

can comment going wrong? rank 2 , 1 here? guess arrays have rank 2.

the array concatenation in fortran 2003 doesn't work think. when concatenate, it's not going stack 2 arrays side side. pick elements first array 1 one , put one-dimensional array. same thing second array append 1-d form of first array.

the following code works.

program matrix implicit none real,dimension (3,3) :: mat1,mat2 real,dimension(18) :: mat3 integer  mat1=reshape( (/1,2,3,4,5,6,7,8,9/),(/3,3/)) mat2=reshape( (/1,2,3,4,5,6,7,8,9/),(/3,3/)) mat3=[mat1,mat2]  print*, shape([mat1,mat2])  !check shape of concatenated array !display i=1,18,1 write(*,10) mat3(i) 10 format(f10.4) end  end program

however, result wanted can achieved using following code

program matrix implicit none real,dimension (3,3) :: mat1,mat2 real,dimension(3,6) :: mat3 integer  mat1=reshape( (/1,2,3,4,5,6,7,8,9/),(/3,3/)) mat2=reshape( (/1,2,3,4,5,6,7,8,9/),(/3,3/))  i=1,3 mat3(i,:)=[mat1(:,i),mat2(:,i)] enddo  !display i=1,3,1 write(*,*) mat3(i,:) end  end program

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