FORTRAN 90
Lecturer : Rafel Hekmat Hameed
University of Babylon
Subject : Fortran 90
College of Engineering
Year : Second B.Sc.
Mechanical Engineering Dep.
Examples about Arrays
EXAMPLE 1
You have matrix a with shape (/3,5/) find the largest element in the matrix
and then find the summation of the row and column containing the largest
element, use format statement to print your results.
Program aa
Implicit none
Integer, parameter :: n=3, m=5
Integer, dimension (n,m):: a
Integer::I,j,s1,s2,j1,i1,maxa
Read(*,*) ((a(I,j),j=1,m),i=1,n)
Maxa=a(1,1)
Do i=1,n
Do j=1,m
If ( a(I,j) .gt.maxa)then
maxa=a(I,j)
i1=i
j1=j
endif
enddo
do j=1,m
ϭ
s1=s1+a(i1,j)
enddo
enddo
do i=1,n
s2=s2+a(I,j1)
enddo
write(*,40) ((a(i,j),j=1,m),i=1,n)
40 format( 5(2x,i3))
Write(*,50) maxa,s1,s2
50 format(2x,"maximum element=",i3,2x,"summation of row=",i5,2x,"summation&
& of column=",2x,i5)
end
EXAMPLE 2
Write a Fortran90 program to computes these two quantities from (10)
numbers; [read the numbers from output file]:
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Program bb
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Implicit none
Integer, parameter::n=10
Real, dimension (n)::x
real:: xbar=0 ,std=0
integer::i
open(1,file='data.dat')
do i=1,n
read(1,*) x(i)
xbar=xbar+x(i)
enddo
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xbar=xbar/n
do i=1,n
std=std+(x(i)-xbar)
enddo
std=sqrt(std/(n-1))
write(*,20)'mean=',xbar ; 20 format(2x,a,f12.8)
write(*,20)'std=',std
end
EXAMPLE 3
Array of rank 2 its shape (/3,4/) Write a program to ascending this matrix as
the sum of each row.
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Program aw
Implicit none
Integer, parameter:: n=3,m=4
Integer, dimension (n,m+1)::a
real,dimension (n)::s
integer:: i,j,z
Read(*,*) ((a(I,j),j=1,m),i=1,n)
Do i=1,n
S(i)=0
Do j=1,m
S(i)=s(i)+a(i,j)
Enddo ; enddo
Do i=1,n
A( i,m+1)=s(i)
enddo
do i=1,n-1
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Do j=1,m+1
If (a( I, m+1) .gt. a(i+1,m+1)) then
Z=a(I,j)
A(I,j) = a(i+1, j)
A( i+1 ,j) = z
Endif
Enddo;enddo
Write(*,67) ((a(I,j), j=1,m+1),i=1,n)
67 format ( 5(2x,i4))
End
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