Reply-to: gamsworld@googlegroups.com
Ah okay, that might mean that GAMS calculates values for the other variables but due to the =G=, FSDC(g) is zero.
The equation is:
VMCE(g)… leos_ww(g)*mc(“w1”)*x(“w1”) + leos_ww(g)*mc(“w1”)*x(“w2”) + leos_s(g)*mc(“s”)*x(“s”) +
leos_r(g)*mc(“r”)*x(“r”) + leos_b(g)*mc(“b”)*x(“b”) + leos_p_P(g)*mc(“p”)*x(“p”) + leos_sm(g)*mc(“sm”)*x(“sm”) + leos_p_S(g)slpx(“p”) =G= FSDC(g);
leos_…(g) are variables (pre-triangular ones)
mc(…) is a parameter
x(…) is a decision variable
the SolVAR for x(…)
---- VAR x activities (ha)
LOWER LEVEL UPPER MARGINAL
w1 1.000 50.000 +INF .
w2 1.000 7.473 +INF .
s 1.000 15.227 +INF .
r 1.000 25.000 +INF .
b . . +INF -64.291
p 1.000 2.300 +INF .
sm . . +INF -27.811
and for leos_…(g) (as an example since these variables exist for each x(…))
---- VAR leos_ww labour requirement for wheat depending on field size (in Akh p
er ha)
LOWER LEVEL UPPER MARGINAL
gew1 1.000 7.717 +INF .
gew2 1.000 7.248 +INF .
gew3 1.000 7.151 +INF .
gew4 1.000 7.352 +INF .
gew5 1.000 6.956 +INF .
gew6 1.000 7.083 +INF .
gew7 1.000 7.550 +INF .
gew8 1.000 7.770 +INF .
gew9 1.000 6.860 +INF .
gew10 1.000 7.006 +INF .
gew11 1.000 7.786 +INF .
gew12 1.000 7.371 +INF .
When I put =E= instead of =G= in the equation above, it is the other way around: GAMS gives out the SolVAR for FSDC (which are constant what should not be since they are dependend on field size expressed in leos_…(g)) and at the same time the SolEQU is zero.
I don’t get the GAMS-language. How can I get different FSDC variables for each g? Or is there a logical mistake?
Thanks a lot,
Amanda
Am Dienstag, 18. März 2014 09:54:06 UTC+1 schrieb Arne Stolbjerg Drud:
Amanda:
You only show us the aggregate numbers for an equation and one variable. You need to combine the math for the equation with ALL the variables that appear in the equations you are interested in.
Arne
\
Arne Stolbjerg Drud
ARKI Consulting & Development A/S
Bagsvaerdvej 246A, DK-2880 Bagsvaerd, Denmark
Phone: (+45) 44 49 03 23(+45) 44 49 03 23, Fax: (+45) 44 49 03 33, email: ad…@arki.dk
From: gams...@googlegroups.com [mailto:gams...@googlegroups.com] On Behalf Of Amanda Eigner
Sent: Tuesday, March 18, 2014 9:26 AM
To: gams...@googlegroups.com
Cc: ad…@arki.dk
Subject: Re: solution report interpretation
Dear Arne,
you are right, it is zero and not empty. Sorry for being unclear… The example for the SolEQU is:
---- EQU VMCE Field sice dependend costs (variable maschine and seasonal labour
costs equation for Gewanne) equation
LOWER LEVEL UPPER MARGINAL
gew1 . 10353.265 +INF .
gew2 . 9754.945 +INF .
gew3 . 9630.668 +INF .
gew4 . 9887.303 +INF .
gew5 . 9380.966 +INF .
gew6 . 9543.683 +INF .
gew7 . 10140.322 +INF .
gew8 . 10421.646 +INF .
gew9 . 9258.424 +INF .
gew10 . 9444.933 +INF .
gew11 . 10441.528 +INF .
gew12 . 9911.471 +INF .
…
and for the SolVAR:
---- VAR FSDC Field Size Dependend Costs (variable maschine and seasonal labour
costs) in Euro
LOWER LEVEL UPPER MARGINAL
gew1 . . +INF EPS
gew2 . . +INF EPS
gew3 . . +INF EPS
gew4 . . +INF EPS
gew5 . . +INF EPS
gew6 . . +INF EPS
gew7 . . +INF EPS
gew8 . . +INF EPS
gew9 . . +INF EPS
gew10 . . +INF EPS
gew11 . . +INF EPS
gew12 . . +INF EPS
…
Why does GAMS calculate s.th. in SolEQU that it doesn’t show in the SolVAR?
Thanks a lot,
Amanda
Am Montag, 17. März 2014 17:56:57 UTC+1 schrieb Arne Stolbjerg Drud:
Amanda:
Could you be interpreting the dot (“.â€) in the LEVEL column as meaning empty? The dot means zero, in the same was as in the LOWER, UPPER, and MARGINAL columns.
If this is not your problem, show us something we do not have to guess.
---- VAR x shipment quantities in cases
LOWER LEVEL UPPER MARGINAL
seattle .new-york . 50.0000 +INF .
seattle .chicago . 300.0000 +INF .
seattle .topeka . . +INF 0.0360
san-diego.new-york . 275.0000 +INF .
Regards
Arne
Arne Stolbjerg Drud
ARKI Consulting & Development A/S
Bagsvaerdvej 246A, DK-2880 Bagsvaerd, Denmark
Phone: (+45) 44 49 03 23(+45) 44 49 03 23(+45) 44 49 03 23(+45) 44 49 03 23, Fax: (+45) 44 49 03 33, email: ad…@arki.dk
From: gams...@googlegroups.com [mailto:gams...@googlegroups.com] On Behalf Of Amanda Eigner
Sent: Monday, March 17, 2014 3:32 PM
To: gams...@googlegroups.com
Subject: solution report interpretation
Dear all,
I have problems with understanding the solution report of GAMS.
Within the SolEQU GAMS shows the results of an equation which calculates a variable for a set (several rows) in the column “levels”.
However, in the SolVAR GAMS doesn’t show the levels of the variables calculated in the equation. Instead, the level column is empty.
Can anyone give me a hint what could be wrong?
Thanks in advance.
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