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Kenneth_Smith
Joined: 18 May 2012
Posts: 697
Location: Hamilton, Lanarkshire, Scotland.
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 Posted: Sat Aug 22, 2015 6:49 pm Post subject: Initialising data for derived types |
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I have recently started using derived types and found this quite useful. I am however finding it difficult to understand how to initialise the variables within a derived type within a parameter construction.
Consider the following code:-
| Code: | winapp
module conductor_lib
implicit none
type acsr !Standard acsr conductor parameters
character(len=10) name !Name
integer al_st !No of Al strands [-]
real al_st_dia !Al strand diameter [mm]
integer fe_st !No of Fe strands [-]
real fe_st_dia !Fr strand diameter [mm]
real csa_al !Area of Al [mm^2]
real csa_fe !Area of Fe [mm^2]
real csa_tot !Area in total [mm^2]
real over_dia !Overall diameter [mm]
real rdc_20 !DC resistance at 20 deg C [ohm/km]
end type acsr
integer rows_acsr_lib
type(acsr), dimension(1:14) :: acsr_lib
contains
subroutine load_acsr_lib
integer i
open (unit=10, file = 'acsr_lib.txt')
rewind 10
read (10,*) rows_acsr_lib
do i = 1, rows_acsr_lib
read(10,*) acsr_lib(i)%name, acsr_lib(i)%al_st, acsr_lib(i)%al_st_dia, acsr_lib(i)%fe_st, &
acsr_lib(i)%fe_st_dia, acsr_lib(i)%csa_al, acsr_lib(i)%csa_fe, &
acsr_lib(i)%csa_tot, acsr_lib(i)%over_dia, acsr_lib(i)%rdc_20
end do
rewind 10
close (unit=10, status = 'keep')
end subroutine load_acsr_lib
end module conductor_lib
program test
use conductor_lib
implicit none
integer i
call load_acsr_lib
do i = 1, rows_acsr_lib
write(6,*)acsr_lib(i)%name, acsr_lib(i)%al_st, acsr_lib(i)%al_st_dia, acsr_lib(i)%fe_st, &
acsr_lib(i)%fe_st_dia, acsr_lib(i)%csa_al, acsr_lib(i)%csa_fe, &
acsr_lib(i)%csa_tot, acsr_lib(i)%over_dia, acsr_lib(i)%rdc_20
end do
end program test
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Here the routine load_acsr_lib opens the file 'acsr_lib.txt' and reads the data describing each of the 14 data sets. The contents of the file is a mixture of character, integer, and reals:-
| Code: |
14
'Gopher', 6, 2.36, 1, 2.40, 26.20, 4.40, 30.60, 7.08, 1.093
'Weasel', 6, 2.59, 1, 2.60, 31.60, 5.30, 36.90, 7.77, 0.908
'Ferret', 6, 3.00, 1, 3.00, 42.40, 7.10, 49.50, 9.00, 0.676
'Rabbit', 6, 3.35, 1, 3.40, 52.90, 8.80, 61.70, 10.05, 0.542
'Horse', 12, 2.79, 7, 2.80, 73.40, 42.80, 116.20, 13.95, 0.393
'Dog', 6, 4.72, 7, 1.60, 105.00, 13.60, 118.50, 14.15, 0.273
'Tiger', 30, 2.36, 7, 2.40, 131.20, 30.60, 161.90, 16.52, 0.220
'Wolf', 30, 2.59, 7, 2.60, 158.10, 36.90, 194.90, 18.13, 0.182
'Dingo', 18, 3.35, 1, 3.40, 158.70, 8.80, 167.50, 16.75, 0.181
'Lynx', 30, 2.79, 7, 2.80, 183.40, 42.80, 226.20, 19.53, 0.157
'Caracal',18, 3.61, 1, 3.60, 184.20, 10.20, 194.50, 18.05, 0.156
'Jaguar', 18, 3.86, 1, 3.90, 210.60, 11.70, 222.30, 19.30, 0.137
'Panther',30, 3.00, 7, 3.00, 212.10, 49.50, 261.50, 21.00, 0.136
'Zebra', 54, 3.18, 7, 3.20, 428.90, 55.60, 484.50, 28.62, 0.067
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How do I initialise this data, within the module conductor_lib with a parameter (or data ?) statement, rather than using the subroutine load_acsr_lib to read the file 'acsr_lib.txt'. All my attempts to do this, have failed. Can somebody point me in the correct direction?
Thanks
Ken |
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mecej4
Joined: 31 Oct 2006
Posts: 1886
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| Posted: Sat Aug 22, 2015 9:39 pm Post subject: |
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One way is to add the following lines just before the line with CONTAINS in your module, as a replacement for the two preceding lines of code:
| Code: |
integer, parameter :: rows_acsr_lib = 14
type(acsr), dimension(1:rows_acsr_lib) :: acsr_lib = (/ &
acsr('Gopher', 6, 2.36, 1, 2.40, 26.20, 4.40, 30.60, 7.08, 1.093), &
acsr('Weasel', 6, 2.59, 1, 2.60, 31.60, 5.30, 36.90, 7.77, 0.908), &
acsr('Ferret', 6, 3.00, 1, 3.00, 42.40, 7.10, 49.50, 9.00, 0.676), &
acsr('Rabbit', 6, 3.35, 1, 3.40, 52.90, 8.80, 61.70, 10.05, 0.542), &
acsr('Horse', 12, 2.79, 7, 2.80, 73.40, 42.80, 116.20, 13.95, 0.393), &
acsr('Dog', 6, 4.72, 7, 1.60, 105.00, 13.60, 118.50, 14.15, 0.273), &
acsr('Tiger', 30, 2.36, 7, 2.40, 131.20, 30.60, 161.90, 16.52, 0.220), &
acsr('Wolf', 30, 2.59, 7, 2.60, 158.10, 36.90, 194.90, 18.13, 0.182), &
acsr('Dingo', 18, 3.35, 1, 3.40, 158.70, 8.80, 167.50, 16.75, 0.181), &
acsr('Lynx', 30, 2.79, 7, 2.80, 183.40, 42.80, 226.20, 19.53, 0.157), &
acsr('Caracal',18, 3.61, 1, 3.60, 184.20, 10.20, 194.50, 18.05, 0.156), &
acsr('Jaguar', 18, 3.86, 1, 3.90, 210.60, 11.70, 222.30, 19.30, 0.137), &
acsr('Panther',30, 3.00, 7, 3.00, 212.10, 49.50, 261.50, 21.00, 0.136), &
acsr('Zebra', 54, 3.18, 7, 3.20, 428.90, 55.60, 484.50, 28.62, 0.067) /)
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I have chosen to make rows_acsr_lib a parameter and acsr_lib an array variable, but you can change these as you please. |
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Kenneth_Smith
Joined: 18 May 2012
Posts: 697
Location: Hamilton, Lanarkshire, Scotland.
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| Posted: Sat Aug 22, 2015 10:18 pm Post subject: |
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Excellent mecej4 - thank you.
Ken |
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