# [closed] Translate AMPL code to GAMS

 0 Following is my model written in AMPL language. Could anyone kindly translate it to GAMS language? Thanks in advance! param m default 26; # must be even param n default 39; set X := {0..n}; set Y := {0..m}; set NODES := X cross Y; # A lattice of Nodes set ANCHORS within NODES := { x in X, y in Y : x == 0 && y >= floor(m/3) && y <= m-floor(m/3) }; param xload {(x,y) in NODES: (x,y) not in ANCHORS} default 0; param yload {(x,y) in NODES: (x,y) not in ANCHORS} default 0; param gcd {x in -n..n, y in -n..n} := (if x < 0 then gcd[-x,y] else (if x == 0 then y else (if y < x then gcd[y,x] else (gcd[y mod x, x]) ))); set ARCS := { (xi,yi) in NODES, (xj,yj) in NODES: abs( xj-xi ) <= 3 && abs(yj-yi) <=3 && abs(gcd[ xj-xi, yj-yi ]) == 1 && ( xi > xj || (xi == xj && yi > yj) ) }; param length {(xi,yi,xj,yj) in ARCS} := sqrt( (xj-xi)^2 + (yj-yi)^2 ); var comp {ARCS} >= 0; var tens {ARCS} >= 0; minimize volume: sum {(xi,yi,xj,yj) in ARCS} length[xi,yi,xj,yj] * (comp[xi,yi,xj,yj] + tens[xi,yi,xj,yj]); subject to Xbalance {(xi,yi) in NODES: (xi,yi) not in ANCHORS}: sum { (xi,yi,xj,yj) in ARCS } ((xj-xi)/length[xi,yi,xj,yj]) * (comp[xi,yi,xj,yj]-tens[xi,yi,xj,yj]) + sum { (xk,yk,xi,yi) in ARCS } ((xi-xk)/length[xk,yk,xi,yi]) * (tens[xk,yk,xi,yi]-comp[xk,yk,xi,yi]) = xload[xi,yi]; ; subject to Ybalance {(xi,yi) in NODES: (xi,yi) not in ANCHORS}: sum { (xi,yi,xj,yj) in ARCS } ((yj-yi)/length[xi,yi,xj,yj]) * (comp[xi,yi,xj,yj]-tens[xi,yi,xj,yj]) + sum { (xk,yk,xi,yi) in ARCS } ((yi-yk)/length[xk,yk,xi,yi]) * (tens[xk,yk,xi,yi]-comp[xk,yk,xi,yi]) = yload[xi,yi]; ; let yload[n,m/2] := -1; solve; printf: "%d \n", card({(xi,yi,xj,yj) in ARCS: comp[xi,yi,xj,yj]+tens[xi,yi,xj,yj] > 1.0e-4}) > structure.out; printf {(xi,yi,xj,yj) in ARCS: comp[xi,yi,xj,yj] + tens[xi,yi,xj,yj] > 1.0e-4}: "%3d %3d %3d %3d %10.4f \n", xi, yi, xj, yj, tens[xi,yi,xj,yj] - comp[xi,yi,xj,yj] > structure.out;  asked 04 Apr '18, 19:34 berkaycelik7 11●2 accept rate: 0% fbahr ♦ 4.6k●7●17 FYI, some starting points can be found @ https://www.or-exchange.org/questions/6021/translate-ampl-code-to-gams ...nevertheless & [most likely] unfortunately (for you), I have to "close" this thread since it -- at least somewhat -- violates the "No homework questions" rule (cf. FAQ). (11 Apr '18, 13:39) fbahr ♦

### The question has been closed for the following reason "Other" by fbahr 11 Apr '18, 13:41

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