An error occurs when the.run file is written in matlab

New to AMPL
,
1

I am a new user of ampl and recently tried to make calls in matlab. This is the.run file I wrote.

reset;
model model.mod;
include data.INIVAL;
#option solver path “E:/AMPL/amplbundle.mswin64/ampl.mswin64”;
#option solver path ‘E:/AMPL/amplbundle.mswin64/ampl.mswin64’;
option solver ipopt;
solve;

However, when I run it, I get an error with the following message:

Ipopt 3.12.13:
Error at _cmdno 507 executing “solve” command
(file r0.run, line 7, offset 194):
can’t open C:\Users\WYM\AppData\Local\Temp\at2444.sol .

I would appreciate it if anyone could give me some answers.

1 Like
2

Hi @Yuanmin,

It looks like ipopt crashed. What happens when you run it directly from the AMPL prompt? Isn’t there any additional output from ipopt?

3

Thank you very much for your reply.
Typing directly at the ampl command line looks like this

ampl: model E:/AMPL/ampl_model/M0.mod
ampl: data E:/AMPL/ampl_model/ig0.dat
ampl: solve;
MINOS 5.51:
Sorry, a demo license is limited to 300 variables and
300 constraints and objectives.
You have 1111 variables, 808 constraints, and 1 objective.
exit value 1

I am a graduate student. Can I apply for such a free license?

4

Hi @Yuanmin,

That error message is due to minos being the default solver. Could you please set option solver ipopt; before solve; and send us the output?