×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# Change specific array elements from an array column

## Change specific array elements from an array column

(OP)
The following question is a repost to this FORTRAN dedicated forum (sorry about that)

Hello all,

although it might sound trivial to more experienced users, I am trying to create a code in FORTRAN (preferably f90 or higher) of a n series x 2 columns matrix, where a condition on some elements of column 1, will change the corresponding elements of column 2 (i.e. only those that have the same "i" with the elements affected by the condition). So far I have managed to do this by creating two (2) column arrays containing the elements and by using a simple "where" command I did what I wanted. Could someone please try to inform me how to perform the same job but without spliting the array into two sub-arrays?

Working example code of what I did follows:

#### CODE --> 95

program test
implicit none
integer::elem
real,dimension(:),allocatable::A
real,dimension(:),allocatable::B
integer::i,j

elem = 10

allocate(A(elem))
allocate(B(elem))

do i=1,10
A(i)=i
end do

do j=1,10
B(j)=0
end do

where (A>=3 .and. A<=6) B = 1

deallocate(A,B)

end program test 

Replies continue below

### RE: Change specific array elements from an array column

#### CODE

program q
integer :: c(10,2), i, j
c(:,1) = (/(i,i=1,10)/)    ;    c(:,2) = 0
write(*,'(I2,2x,I2)') ( (c(i,j),j=1,2), i=1,10 )
where ( c(:,1) >=3 .and. c(:,1) <=6 )  c(:,2) = 1
write(*,'(I2,2x,I2)') ( (c(i,j),j=1,2), i=1,10 )
end program q 

### RE: Change specific array elements from an array column

(OP)
Hi gsal! I found it myself and posted my reply to the other thread. Just when I was thinking to join this thread and delete my post, I came across your reply. Nice coding there mate! Thank you very much for your effort!

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!