Re: [Help-glpk] Can I simulate step function in GLPK?

[Michael Hennebry]

On Wed, 1 Sep 2010, xiaomi wrote:

> Thanks, Michael. I am sorry there are several typo in my original statement. 
> Let me recify it as follows:
> for example: step function y=u(5);
> maxmize y
> y<=M(x-5) , where M is a large number to simulate sharp slope.
> y<=1;
>
> The only wired thing is that when x<5, y will be y  <= a number that is 
> negative. However if y  is  nongative as default, can this property restrict 
> y to be 0 when x<5? (without binary)

No.
If M(x-5) must be less than zero,
the problem described is infeasible.
You'll need to make y binary.

--
Michael   address@hidden
"Pessimist: The glass is half empty.
Optimist:   The glass is half full.
Engineer:   The glass is twice as big as it needs to be."