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commercial diameter - declare

Posted: Tue Aug 13, 2019 8:32 pm
by Alexanre.ito
Hi,
I have a problem where I have to calculate the diameter of a pipe, using the equations I will find the diameter value that is a decimal number.
But the diameter I will use is the commercial value, always selecting the next commercial size of the value found by the equations.
Then I must analyze the cost of these pipes as a function of the diameter and the length of the mesh.

d (mm) pre├žo($/m)
100 7,5
150 10,25
...

I don't know how to enter this information.
If I must use the dollar, table, scalar, equation or upper and lower limit condition.

which of these methods is the best practice to use in GAMS because I would use (VLOOKUP, ..., IF...) table between intervals in EXCEL.

Re: commercial diameter - declare

Posted: Fri Sep 06, 2019 6:58 pm
by Alexanre.ito
I founded the answer:
Special Features for Mathematical Programs:
https://www.gams.com/latest/docs/UG_Lan ... tures.html