Originally posted by: 88Simon88

Hello everyone, 

I want to write an opl code to do the piecewise-linear function but the origin of the function is not zero. I appreciate you if could help me in this regard.

Best regards.

Hi,

the example in the OPL documentation answers this:

int n=2;
float objectiveforxequals0=300;
float breakpoint[1..n]=[100,200];
float slope[1..n+1]=[1,2,-3];
dvar int x;

maximize piecewise(i in 1..n) 
{slope[i] -> breakpoint[i]; slope[n+1]}(0,objectiveforxequals0) x; 

subject to
{
 true;  

}

 

but let me try to make this even clearer

 

int n=2;
float objectiveforxequals0=300;
float breakpoint[1..n]=[100,200];
float slope[1..n+1]=[1,2,-3];

pwlFunction f= piecewise(i in 1..n)
{slope[i] -> breakpoint[i]; slope[n+1]}(0,objectiveforxequals0) ;

float v=f(0);

execute
{
  writeln(v);
}

 

 

gives

 

300

 

regards

 

Originally posted by: 88Simon88

Thank you very much Alex. You are always helpful.