# Solving a linear programming problem uising linprog

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Sergio am 23 Mai 2024 um 9:40
Kommentiert: Sergio am 23 Mai 2024 um 13:16
I have the given linear program to solve.
To solve this I prepare the following for the constraints on each of the six variables:
A = [110 205 160 160 420 260;
4 32 13 8 4 14;
2 12 54 285 22 80];
b = [2000 55 800];
where the function to be minimized with constraints:
f = [3 24 13 9 20 19];
lb = [0,0,0,0,0,0];
ub = [4,3,2,8,2,2];
Is solved by:
options = optimoptions('linprog','Algorithm','dual-simplex');
[x,fval,exitflag,output] = linprog(f,A,b,lb,ub,options)
.
I get "Error using linprog (line 182)
LINPROG requires the following inputs to be of data type double: 'LB'"
How do I prepare the linear inequalities correctly?
With Thanks
##### 2 KommentareKeine anzeigenKeine ausblenden
Ayush Modi am 23 Mai 2024 um 9:57
Try this ->
beq = [2000;55;800];
Sergio am 23 Mai 2024 um 10:09
@Ayush Modi I found that out, it was wrong to have beq in the code. I removed it, now it should be right, but the error is completely different now..

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### Akzeptierte Antwort

Torsten am 23 Mai 2024 um 11:55
Bearbeitet: Torsten am 23 Mai 2024 um 11:56
A = -[110 205 160 160 420 260;...
4 32 13 8 4 14;...
2 12 54 285 22 80];
b = -[2000; 55; 800];
Aeq = [];
beq = [];
where the function to be minimized with constraints:
f = [3 24 13 9 20 19];
lb = [0,0,0,0,0,0];
ub = [4,3,2,8,2,2];
Is solved by:
options = optimoptions('linprog','Algorithm','dual-simplex');
[x,fval,exitflag,output] = linprog(f,A,b,Aeq,beq,lb,ub,options)
Optimal solution found.
x = 6x1
4.0000 0 0 4.5000 2.0000 0
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fval = 92.5000
exitflag = 1
output = struct with fields:
iterations: 3 algorithm: 'dual-simplex-highs' constrviolation: 0 message: 'Optimal solution found.' firstorderopt: 1.7764e-15
##### 1 Kommentar-1 ältere Kommentare anzeigen-1 ältere Kommentare ausblenden
Sergio am 23 Mai 2024 um 13:16
Formidable. Thanks Torsten!

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### Weitere Antworten (1)

Ayush Modi am 23 Mai 2024 um 10:14
Bearbeitet: Ayush Modi am 23 Mai 2024 um 10:14
Hi Sergio,
The error you are getting is because of extra parameters in the function call. Here is how you can make the call to the "linprog" function with lower and upper bounds:
x = linprog(f,A,b,Aeq,beq,lb,ub,options) % Maximum 8 parameters
Refer to the following MathWorks documentation for more information on syntax of "linprog" function:
##### 1 Kommentar-1 ältere Kommentare anzeigen-1 ältere Kommentare ausblenden
Sergio am 23 Mai 2024 um 10:24
Sorry, that doesn't work.

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