# AMPL support

 2 Hello again, is there any good websites/online forums where people discuss AMPL modeling? appreciate your suggestions... Meanwhile, I'd like to know in AMPL, [x] == Biggest integer lower than 'x'  How do you define the above in AMPL? Thanks in advance asked 11 Dec '11, 11:29 Pavan 300●2●9●21 accept rate: 0% fbahr ♦ 4.6k●7●16 -2 I hope Robert Fourer is in this OR-Exchange group. That certain AMPL google group has been (to my knowledge) is inactive for quite sometime. Meanwhile, let me fine tune my model first. (12 Dec '11, 00:17) Pavan 3 AMPL google group is definitely active. Bob answered a question as late as today (12-dec). (12 Dec '11, 02:06) Erling

 5 AMPL questions should be asked in their discussion forum : AMPL Google Group But the outcome might be the same as asking here, since a certain fast typing Paul Rubin is answering lots of questions both here and on their forum (in fact any optimization forum :-)) answered 11 Dec '11, 11:40 Bo Jensen ♦ 5.0k●2●9●19 accept rate: 14%
 5 I follow OR Exchange though as yet I don't have enough (%#)(#@\$(^@% reputation points to use it all that effectively. Regarding the AMPL Google group, as of right now it shows 6 posts in the past 24 hours. answered 14 Dec '11, 14:07 4er 641●2●7 accept rate: 0% @4er: Afaik, with 41 karma points you can vote on questions and answers (up-votes only, though) and are able to edit community wikis/questions (was 100pts - but has been lowered to 30pts by @Michael Trick [btw, someone with 'super-powers' ought to update the FAQ entry on this]). 10pts left, and you are allowed to leave comments on posts. 50pts more, down-voting, and another 150pts more, re-tagging questions. - The usual way to achieve this would be: contribute like crazy...) (15 Dec '11, 07:52) fbahr ♦
 2 If x is a parameter: floor(x). If x is a continuous variable, let me point you to: http://yetanothermathprogrammingconsultant.blogspot.com/2009/02/floor-in-minlp-model.html#comment-form Make sure your specify finite bounds for your integer variable. As you can see, the floor function can potentially be very expensive if the range of x is large. answered 11 Dec '11, 14:33 Gilead ♦ 2.3k●5●14 accept rate: 15% Thank you Gilead, I just looked at your blog and let me try it asap! (12 Dec '11, 00:14) Pavan 1 That is not my blog but the blog of Erwin Kalvelagen. You should bookmark it for future reference. (12 Dec '11, 00:16) Gilead ♦ Ok... Thanks for the heads-up! (12 Dec '11, 00:18) Pavan
 0 A blog post on the subject : Erwin Kalvelagen's blog answered 15 Dec '11, 18:00 Bo Jensen ♦ 5.0k●2●9●19 accept rate: 14%
 toggle preview community wiki

By Email:

Markdown Basics

• *italic* or _italic_
• **bold** or __bold__
• image?![alt text](/path/img.jpg "Title")
• numbered list: 1. Foo 2. Bar
• to add a line break simply add two spaces to where you would like the new line to be.
• basic HTML tags are also supported

Tags:

×127
×29