Could anyone please explain what difference does a fix statement make in the optmodel procedure?
Thanks in advance.
Initial value vs. actually fixed value. Compare results.
Proc optmodel;
var x;
x=2;
con con: x<=10;
max obj=x;
solve;
put x=;
quit;
Proc optmodel;
var x;
fix x=2;
con con: x<=10;
max obj=x;
solve;
put x=;
quit;
It sets/fixes a variable to a certain value.
Exactly as in:
proc optmodel;
var x{1..10};
fix x = 0;
fix x[10] = 1;
Thanks for the reply.
But, what's the diffrence between the following two programs?
1)
Proc optmodel;
var x;
x=2;
put x=;
quit;
2)
Proc optmodel;
var x;
fix x=2;
put x=;
quit;
Initial value vs. actually fixed value. Compare results.
Proc optmodel;
var x;
x=2;
con con: x<=10;
max obj=x;
solve;
put x=;
quit;
Proc optmodel;
var x;
fix x=2;
con con: x<=10;
max obj=x;
solve;
put x=;
quit;
It now explains. Thanks a lot.
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