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identification division.
program-id. elastic.
* aus D.Nowottny p. 77
* Mathematik am Computer
author. "JD".
date-written. 24.9.2006.
date-compiled.
data division.
working-storage section.
78 anz pic 9(4) value 100.
78 n pic 9(4) value 100.
78 n2 pic 9(4) value 200.
78 m pic 9(4) value 100.
78 m2 pic 9(4) value 200.
01 occurs n.
05 mm pic 9(4)V99 occurs n.
77 i pic 9(4).
77 j pic 9(4).
77 k pic 9(4).
77 te pic 9(4).
77 c pic 9(4).
77 hi pic 9(4).
77 l pic 9(4).
77 h pic 9(4).
77 y pic 9(4).
77 nenner pic 9(4).
01 diff pic 9(4) occurs n2.
linkage section.
01 p pic 9(4)V99 occurs n2.
01 f pic 9(4)V99 occurs m2.
01 a pic 9(4)V99 occurs n2.
01 x pic 9(4)V99 occurs m2.
procedure division using p f a x.
* Tragwerk auf 2 Stützen
* p= koordinaten f=Kräfte, a=Topologie, x=Verschiebungen
perform varying i from 1 until i > n
perform varying j from 1 until i > n
move 0 to mm(i,j)
end-perform
end-perform
perform varying k from 1 until k > anz
move a(1,k) to i
move a(2,k) to j
move a(3,k) to c
perform varying l from 1 until l > n
compute diff(l) = p(j)-p(i)
end-perform
move 0 to nenner
perform varying l from 1 until l > n
compute nenner=nenner+diff(l)*diff(l)
end-perform
* dyadisches produkt
perform varying i from 1 until i > n
perform varying j from 1 until i > n
compute hi(i,j) = c/nenner * x(i)*y(j)
end-perform
end-perform
* [ Hi -Hi; -Hi Hi]t
perform varying i from 1 until i > n
perform varying j from 1 until i > n
compute h(i,j) = Hi(i,j)
compute h(i+n,j) = - Hi(i,j)
compute h(i,j+n) = Hi(i,j)
compute h(i+n,j+n) = Hi(i,j)
end-perform
end-perform
compute te=2*i-1
compute m(te,te)=M(te,te)+H
end-perform.
perform varying i from 1 until i > n
perform varying j from 1 until i > n
if (i>n) or (j>n) then
move 0 to m(i,j)
move 0 to Hi(i,j)
end-perform
end-perform
call agev using X M F
* X=Reshape(X,2,m)
call reshape using X 2 M
* nun sind die Verschiebungen berechnet
end-program elastic.
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