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Vector products: Difference between revisions
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</pre>
=={{header|Fortran}}==▼
{{works with|Fortran|95 and later}}▼
Specialized for 3-dimensional vectors.▼
<lang fortran>program VectorProducts▼
real, dimension(3) :: a, b, c▼
a = (/ 3, 4, 5 /)▼
b = (/ 4, 3, 5 /)▼
c = (/ -5, -12, -13 /)▼
print *, dot_product(a, b)▼
print *, cross_product(a, b)▼
print *, s3_product(a, b, c)▼
print *, v3_product(a, b, c)▼
contains▼
function cross_product(a, b)▼
real, dimension(3) :: cross_product▼
real, dimension(3), intent(in) :: a, b▼
cross_product(1) = a(2)*b(3) - a(3)*b(2)▼
cross_product(2) = a(3)*b(1) - a(1)*b(3)▼
cross_product(3) = a(1)*b(2) - b(1)*a(2)▼
end function cross_product▼
function s3_product(a, b, c)▼
real :: s3_product▼
real, dimension(3), intent(in) :: a, b, c▼
s3_product = dot_product(a, cross_product(b, c))▼
end function s3_product▼
function v3_product(a, b, c)▼
real, dimension(3) :: v3_product▼
real, dimension(3), intent(in) :: a, b, c▼
v3_product = cross_product(a, cross_product(b, c))▼
end function v3_product▼
end program VectorProducts</lang>▼
Output▼
<pre> 49.0000▼
5.00000 5.00000 -7.00000▼
6.00000▼
-267.000 204.000 -3.00000▼
</pre>▼
=={{header|Forth}}==
{{works with|Forth|with a separate floating point stack.}}<lang Forth>
Line 847 ⟶ 799:
a . [b x c] = 6.00000
a x [b x c] = -267.000 204.000 -3.00000
▲</pre>
▲=={{header|Fortran}}==
▲{{works with|Fortran|95 and later}}
▲Specialized for 3-dimensional vectors.
▲<lang fortran>program VectorProducts
▲ real, dimension(3) :: a, b, c
▲ a = (/ 3, 4, 5 /)
▲ b = (/ 4, 3, 5 /)
▲ c = (/ -5, -12, -13 /)
▲ print *, dot_product(a, b)
▲ print *, cross_product(a, b)
▲ print *, s3_product(a, b, c)
▲ print *, v3_product(a, b, c)
▲contains
▲ function cross_product(a, b)
▲ real, dimension(3) :: cross_product
▲ real, dimension(3), intent(in) :: a, b
▲ cross_product(1) = a(2)*b(3) - a(3)*b(2)
▲ cross_product(2) = a(3)*b(1) - a(1)*b(3)
▲ cross_product(3) = a(1)*b(2) - b(1)*a(2)
▲ end function cross_product
▲ function s3_product(a, b, c)
▲ real :: s3_product
▲ real, dimension(3), intent(in) :: a, b, c
▲ s3_product = dot_product(a, cross_product(b, c))
▲ end function s3_product
▲ function v3_product(a, b, c)
▲ real, dimension(3) :: v3_product
▲ real, dimension(3), intent(in) :: a, b, c
▲ v3_product = cross_product(a, cross_product(b, c))
▲ end function v3_product
▲end program VectorProducts</lang>
▲Output
▲<pre> 49.0000
▲ 5.00000 5.00000 -7.00000
▲ 6.00000
▲ -267.000 204.000 -3.00000
</pre>
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