### Highlights from mixed-integer LP

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# mixed-integer LP

### Sherif Tawfik (view profile)

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)
27 Jan 2016 RK

27 Jan 2016 RK

### RK (view profile)

Hi Amani,

Click on the tag ( general integer linear programming), then you will see the code.

Best

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04 Jan 2016 Amani mahdy

### Amani mahdy (view profile)

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16 Oct 2014 ABY SUBIN

### ABY SUBIN (view profile)

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 (view profile)

02 Nov 2013 Muhammad Faraz Sahito

### Muhammad Faraz Sahito (view profile)

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02 Nov 2013 Muhammad Faraz Sahito

a

25 Jun 2013 Ziba

### Ziba (view profile)

Thank you very much

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05 May 2013 mostafa amer

### mostafa amer (view profile)

how to u use?

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19 Sep 2012 protein

### protein (view profile)

16 May 2012 Tung Le

### Tung Le (view profile)

thank you very much!

08 May 2012 Marino Pagan

### Marino Pagan (view profile)

Thank you!

24 Feb 2012 Erdal Bizkevelci

### Erdal Bizkevelci (view profile)

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

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

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29 Oct 2011 Sivaramakrishnan Raman

### Sivaramakrishnan Raman (view profile)

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 (view profile)

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 (view profile)

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 (view profile)

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

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18 Nov 2008 Varun

### Varun (view profile)

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?

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

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26 May 2005 Toni Jarimo