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Nov 28, 2023, 4:59:23 PM11/28/23

to AMPL Modeling Language

Hello, I´m trying to model a problem in AMPL with Baron;

But when I run the model, this is the result

BARON 23.3.11 (2023.03.11):

Could not find "".

Could not find "".

0 iterations, optimal within tolerances.

Objective 0

Any idea why this is happen?

Here is the code of the problem

set pol; #Objetos

set ver =1..4; #Vertices

param I:=3;

set vert{2..I} within ver;

param area {pol}>=0;

#variables

var r >=0;

var X {k in pol, j in ver};

var Y {k in pol, j in ver};

var A {k in pol, l in pol};

var B {l in pol, k in pol};

var Vx {k in pol, j in ver};

var Vy {k in pol, j in ver};

minimize obj: r;

#Objeto

s.t. Rad{k in pol, j in ver}: X[k,j]^2+Y[k,j]<=r^2;

s.t. la1{k in pol, j in 2..I}: ((X[k,j-1]-X[k,j])*(Y[k,j-1]-Y[k,j]))+((X[k,j]-X[k,j+1])*(Y[k,j]-Y[k,j+1]))=0;

s.t. la2{k in pol}: ((X[k,4]-X[k,3])*(Y[k,4]-Y[k,3]))+((X[k,1]-X[k,4])*(Y[k,1]-Y[k,4]))=0;

s.t. are{k in pol}:((X[k,4]-X[k,3])^2 + (Y[k,2]-Y[k,1])^2) * ((X[k,3]-X[k,2]^2) + (Y[k,3]-Y[k,2])^2)==area[k]**2;

Greetings

Nov 28, 2023, 8:36:59 PM11/28/23

to AMPL Modeling Language

Given only the information that you have provided, I have not been able to exactly reproduce your error messages. To get more help, you'll need to provide also the data for the model.

If you set any options for BARON, then also include the option string or listing that you used.

If you set any options for BARON, then also include the option string or listing that you used.

--

Robert Fourer

We're switching to a new, enhanced user forum.

Join it now at discuss.ampl.com.

Message has been deleted

Nov 30, 2023, 3:10:13 PM11/30/23

to AMPL Modeling Language

ampl: include ModG.run; BARON 23.3.11 (2023.03.11): 0 iterations, optimal within tolerances. Objective 0 ampl: display _varname, _var; : _varname _var := 1 r 0 2 'X[1,1]' 0 3 'X[1,2]' 1 4 'X[1,3]' 1.1727 5 'X[1,4]' 1.4175 6 'X[2,1]' 2.1032 7 'X[2,2]' -1.16572 8 'X[2,3]' 2.18376 9 'X[2,4]' -2.22046 10 'Y[1,1]' -3.80619 11 'Y[1,2]' -2.99452 12 'Y[1,3]' -7.69438 13 'Y[1,4]' -4.37879 14 'Y[2,1]' -5.17345 15 'Y[2,2]' -5.17345 16 'Y[2,3]' -5.17345 17 'Y[2,4]' -5.17345 18 'A[1,1]' 3.36632 19 'A[1,2]' 4.71849 20 'A[2,1]' 6.79761 21 'A[2,2]' 6.27885 22 'B[1,1]' -4.77927 23 'B[1,2]' -7.51784 24 'B[2,1]' -10.3926 25 'B[2,2]' -7.58207 26 'Vx[1,1]' -0.984735 27 'Vx[1,2]' -0.982566 28 'Vx[2,1]' -0.555897 29 'Vx[2,2]' -0.614571 30 'Vy[1,1]' 0.174063 31 'Vy[1,2]' -0.185912 32 'Vy[2,1]' -0.831251 33 'Vy[2,2]' -0.788861 ;

I did find a similar message, when incorrectly setting a local solver for BARON to use:

ampl: option baron_options 'lsolver='; ampl: solve; BARON 23.3.11 (2023.03.11): lsolver= Cannot find ""; ignoring lsolver. BARON 23.3.11 (2023.03.11): 0 iterations, optimal within tolerances. Objective 0

Here are some things you might check:

- Are you trying to use a subsolver or an options file, which perhaps BARON cannot find?
- I ran my tests on Windows. Are you using a different operating system? Maybe the "Could not find" messages only appear on a certain platform.
- When you run BARON, after the "Could not find" messages, it reports "0 iterations, optimal within tolerances. Objective 0" -- just like on my computer. If you execute "display _varname, _var;" after solving, do you see the same results that I have shown above?

{#HS:2436133898-120873#}

On Wed, Nov 29, 2023 at 6:10 PM UTC, AMPL Modeling Language <am...@googlegroups.com> wrote:

Here's all files from the model

On Wed, Nov 29, 2023 at 6:10 PM UTC, AMPL Modeling Language <am...@googlegroups.com> wrote:

Sorry, here's all the data, I added more code but same error

On Wed, Nov 29, 2023 at 1:36 AM UTC, AMPL Google Group <am...@googlegroups.com> wrote:

Given only the information that you have provided, I have not been able to exactly reproduce your error messages. To get more help, you'll need to provide also the data for the model.

If you set any options for BARON, then also include the option string or listing that you used.

--

Robert Fourer

We're switching to a new, enhanced user forum.

Join it now at discuss.ampl.com.

Dec 1, 2023, 12:50:11 PM12/1/23

to AMPL Modeling Language

The option of display _ varname, _var works.

Thanks alot!

Happy Holidays!

Happy Holidays!

Dec 4, 2023, 12:22:32 PM12/4/23

to AMPL Modeling Language

Good! For other ways to use the "display" command, see Chapter 12 Display Commands in the AMPL book.

{#HS:2436133898-120873#}

On Fri, Dec 1, 2023 at 5:50 PM UTC, AMPL Modeling Language <am...@googlegroups.com> wrote:

The option of display _ varname, _var works.

Thanks alot!

Happy Holidays!

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