GLPK：访问可变长度的数据数组

Question

set ORIG;
set DEST;
set LINKS within {ORIG,DEST};

printf {i in ORIG, j in DEST} "LINKS[%s,%s] = %g \n",i,j,LINKS[i][j];

data;

set ORIG := GARY CLEV PITT;
set DEST := FRA DET LAN WIN STL FRE LAF;

set LINKS := 
   (GARY,*) DET LAN STL LAF
   (CLEV,*) FRA DET LAN WIN STL LAF
   (PITT,*) FRA WIN STL FRE;

end;

这将停止并显示此错误消息：

LINKS cannot be subscripted

如何定义 LINKS 以便可以使用 LINKS[i][j] 访问它？

Answer 1

根据 gnu-help 的一些建议，这似乎是一个更好的语法对于这个问题：

set ORIG;
set DEST;

param LINKS{ORIG, DEST} default 0;

for {i in ORIG, j in DEST} printf "LINKS[%s,%s] = %g \n",i,j,LINKS[i,j];

data;

set ORIG := GARY CLEV PITT;
set DEST := FRA DET LAN WIN STL FRE LAF;


param LINKS : FRA DET LAN WIN STL FRE LAF :=
     GARY   1 2 3 4 5 6 .
     CLEV   . 2 . 4 . 6 .
     PITT   1 2 3 4 5 6 7;
end;

GLPK：访问可变长度的数据数组

GLPK: access to data array with variable length

glpk