Originally posted by: khadeejah

Hi All,

       I insert my data in the data file, i want to make sure that cplex read it as i meant it to be. is there such a command to read the data as cplex?

Hi,

is your data an excel file or flat data ?

Anyway in a .dat you can have some scripting. (prepare/invoke)

In the .mod you may use assert in order to check some assertions

regards

Originally posted by: khadeejah

Thanks alot Alex.

it's a .dat.

I'll do what you've suggested.

Thanks again.

Originally posted by: khadeejah

I read the help for (prepare/invoke).

My problem is that i have a demand that should be satisfied by period 3, one of the decision variables displays results beyond period 3 !!! thats why i thought maybe cplex is not reading my data as i meant it to be and hence i have to use a syntax to guarantee a correct declaration of the data; however  there are no errors in the mod nor data files.

so what is the right way to trigger the pitfall of the data? is it by using prepare/invoke or they should be used together. if so may you provide a simple example? 

If possible, I prefer to add asserts in the .mod

regards

Originally posted by: khadeejah

i put it before the constraint that produces such weird result, as follows: 

 assert   
forall ( i in MTOprod, s in stages, t in periods: t-1>=1 && s+1 in stages)
ctinv6: RQist [i][s][t]+ OQist [i][s][t]+ IQist [i][s][t-1]-RQist [i][s+1][t]- OQist [i][s+1][t]== IQist [i][s][t];

but i had an error : unexpected assert.

Hi

the assert should not be in the subject to block but before

regards

Originally posted by: khadeejah

you mean by block,

that it ignore / block that constraint so it doesnt execute it??

Hi,

I mean "assert" should not be in the "subject to" block.

Let me give you an example:

int n=3;

assert n<=4;

dvar int x;
maximize x;
subject to
{
x<=n;
}

regards