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mixed-integer LP

by

Sherif Tawfik

 

23 Feb 2005 (Updated )

This function solves the mixed integer linear programming problems.

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Description

This function solves the mixed integer linear programming problems. It uses the linprog.m function that comes with the optimization toolbox of MATLAB. It employs the branch and bound algorithm. It uses depth first search.

Required Products Optimization Toolbox
MATLAB release MATLAB 6.5 (R13)
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Comments and Ratings (30)
16 Oct 2014 ABY SUBIN

ABY SUBIN

Thank you very much for the code.It saved a lot of my time.For binary integer (0,1) problems , just set the upper and lower bound as 0 and 1.

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18 Feb 2014 Thalita Monteiro

Thalita Monteiro

 
02 Nov 2013 Muhammad Faraz Sahito

Muhammad Faraz Sahito

It was very helpful, Thanks

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02 Nov 2013 Muhammad Faraz Sahito

Muhammad Faraz Sahito

a

25 Jun 2013 Ziba

Ziba

Thank you very much

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05 May 2013 mostafa amer

mostafa amer

how to u use?

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19 Sep 2012 protein

protein

 
16 May 2012 Tung Le

Tung Le

thank you very much!

08 May 2012 Marino Pagan

Marino Pagan

Thank you!

24 Feb 2012 Erdal Bizkevelci

Erdal Bizkevelci

 
06 Jan 2012 Hamidreza Nourzadeh

Hamidreza Nourzadeh

Try a large scale Integer linear programming problem (e.g. 100000 variable). Because of rec function you will get the following error.

Maximum recursion limit of 500 reached. Use set(0,'RecursionLimit',N)
to change the limit. Be aware that exceeding your available stack space can
crash MATLAB and/or your computer.

Error in optimget>optimgetfast
is there any way to fix it ?

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29 Oct 2011 Sivaramakrishnan Raman

It does not work for only 2 integer variables. Please bother to at least understand the syntax. M is a vector which denotes the indices of 'x' which are integers.

12 Oct 2011 Tom

Tom

what datatype do the inputs have to be? I've tried all except 'e' being single, double, int16/32/64, uint16/32/64 with no luck...i keep getting the error message 'Undefined function 'IP1' for input arguments of type 'XXXX'.'

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22 Jul 2011 Naveen

Naveen

some of my variables are binary integers (0 or 1). how can i specify them by using this function?

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19 Nov 2008 Varun

Varun

Does this code work for only 2 variable problems???

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18 Nov 2008 Varun

Varun

I used the code for a model but I got the following error- Please Comment on the same:

??? Error using ==> vertcat
CAT arguments dimensions are not consistent.
Error in ==> IP>rec at 86
b1=[b;floor(br_value)];
Error in ==> IP at 36
[x,val,status,b]=rec(f,A,b,Aeq,beq,lb,ub,x0,val0,M,e,bound); % a recursive function that processes the BB tree
Error in ==> Full at 573
[x v s]= IP(f,A,b,Aeq,beq,lb,ub,M,e)

I am getting very close to my deadline so a fast solution would be appreciated.

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09 Aug 2008 Ez Zaza

Can you provide the code for finding 0/1 optimization? Thank you

13 May 2008 Bojan Oslaj  
15 Sep 2007 Arendo B

Many Thanks, but for some example if i chang the arrangment of rows for A(and b) or Aeq(and beq), the result is changed. for exapmle when the A or Aeq are very narrow. (the columns are more than rows)

29 Jun 2007 P Banerjee

I spent 5 days trying to write my code on similar lines to the way bintprog is written and finally I gave up. This free code is simply very good and serves all my purposes.

29 May 2007 Hanen Hanna  
22 Jan 2007 akro makro  
02 Aug 2006 sun bo

This is a very good function However m=1 or 2 respectively mean?

03 May 2006 3adel Emam

it solves a problem with 2 integer variables only. what if we have more continues or discrete variables?
the other thing is the MILP function has to create and search the whole branch and bound tree,not just two subproblems.

06 Apr 2006 Altaf Alfarhan

IP function is excellent for solving pure integer linear programming problems.
It was very helpful for me as a student.

14 Feb 2006 David Zeng

Only one word, Excellent!

08 Jan 2006 Vincenzo Manzoni

I am an italian student of engineering. Thanks a lot for your Matlab function: it works very good.

04 Sep 2005 Ruoyu Cheng

Based on the solution to several test MILP problems, I would like to say that this function is rather valuable for academic studies on mixed-integer linear programming.
The interested researchers can conveniently modify the file to adapt to their own purposes, .e.g., to incorporate more advanced techniques.

14 Jun 2005 zhang lipu

ok,tks
i am a teacher from china.
tks a lot.
locustzhang@163.com

Comment only
26 May 2005 Toni Jarimo  
Updates
28 Feb 2005

An example of how to use the function is added

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