Solver IPOPT "presolve" in AMPL IDE and NEOS

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Mar 26, 2020, 2:52:49 AM3/26/20

to AMPL Modeling Language

Dear all,

I try to do a code on AMPL IDE and NEOS, and both of the solver are IPOPT (3.12.13 version), and there are presolve the code in NEOS, but doesn't in AMPL IDE, how can I do to let AMPL IDE presolve or let NEOS not to presolve?

I have try "option 'presolve 0';" this command on NEOS, but it still presolve that.

The picture are the result at AMPL IDE and NEOS.

擷取1.PNG

擷取.PNG

Thank you,

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AMPL Google Group

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Mar 26, 2020, 11:57:10 AM3/26/20

to AMPL Modeling Language

In the AMPL command file that you send to NEOS, to turn off AMPL's presolve, you should specify

option presolve 0;

without any quotes around the 'presolve 0' part. If that does not work, send a reply to this group with all of your files attached.

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Robert Fourer
am...@googlegroups.com

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AMPL Google Group

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Mar 27, 2020, 2:47:57 PM3/27/20

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This was answered in another thread.

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Robert Fourer
am...@googlegroups.com

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On Thu, Mar 26, 2020 at 4:48 PM UTC, AMPL Modeling Language <am...@googlegroups.com> wrote:

I have try the 'presolve 0' without any quotes, but there are another error appear. There are my file attached, the picture is the error message on NEOS, thanks for your help.

AMPL Google Group於 2020年3月26日星期四 UTC+8下午11時57分10秒寫道：

In the AMPL command file that you send to NEOS, to turn off AMPL's presolve, you should specify

option presolve 0;

without any quotes around the 'presolve 0' part. If that does not work, send a reply to this group with all of your files attached.

--
Robert Fourer

[url=javascript:]am...@googlegroups.com

On Thu, Mar 26, 2020 at 3:54 PM UTC, AMPL Google Group <am...@googlegroups.com> wrote:

In the AMPL command file that you send to NEOS, to turn off AMPL's presolve, you should specify

option presolve 0;

without any quotes around the 'presolve 0' part. If that does not work, send a reply to this group with all of your files attached.

--
Robert Fourer
am...@googlegroups.com

湯定展

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Mar 29, 2020, 11:26:41 PM3/29/20

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OK~thanks for your help.

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AMPL Google Group <am...@googlegroups.com> 於 2020年3月28日週六上午2:47寫道：

To view this discussion on the web visit https://groups.google.com/d/msgid/ampl/reply-77152-1120055647-3186527116-1585334866-248849425%40helpscout.net.

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