problem with undefined index in variables

[Alessandro Oscar Gilardino Arias]

Dear Bob and Victor,

How are you?

I have a question about a problem I am having in my constraint, the constraint is the following

subject to Inventario_BH40 {(fa,t) in SETD11}:

if t=1 then -sum {(bm,col) in PATRON} PATRONES40[bm,col] * BMC[bm,col,fa,t] + sum{(bh,fa,t1) in SETD2 :t1=1 and t1=t and bh=1} IFBH[bh,fa,t1] - IIBH[bh,fa] + sum{(j,k,t) in SETD2:j=1 and k=fa} Y[j,k,t]

else -sum {(bm,col) in PATRON} PATRONES40[bm,col] * BMC[bm,col,fa,t] + sum{(bh,fa,t1) in SETD2 :t1>1 and t1=t and bh=1} IFBH[bh,fa,t1] - IFBH[bh,fa,t1-1] + sum{(j,k,t1) in SETD2:j=1 and k=fa and t1=t} Y[j,k,t1] = 0;

and I have the following mesages:

modelo_cortes.mod, line 71 (offset 2413):

bh is undefined

modelo_cortes.mod, line 72 (offset 2610):

t1 is not defined

modelo_cortes.mod, line 72 (offset 2610):

bh is undefined

Why I am having those messages??

Thanks in advance!

[Robert Fourer]

These errors occur because you need to parenthesize a summand that involves one term plus or minus another. See for example this explanation from an earlier post:

https://groups.google.com/d/msg/ampl/uhzjwNfxXDk/1XhB3bspAwAJ

Bob Fourer
am...@googlegroups.com

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