# Error using fmincon (line 288) A must have 1 column(s).

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tahseen alshmary on 28 Nov 2018
Commented: Walter Roberson on 29 Nov 2018
i have this problem any one know how can i solve it
Error using fmincon (line 288)
A must have 1 column(s).
Error in Untitled3 (line 34)
[x,fval,exitflag,output] = fmincon(fun,nvars,A,b,Aeq,beq,LB,UB,nonlcon,IntCon,options)
the code is
clc
clear all
fun=@(x) 2.633*x(1)+2.992*x(2)+3.134*x(3)+3.678*x(4)+3.620*x(5)+2.948*x(6)+1.607*x(7)+2.952*x(8)+3.348*x(9)+3.680*x(10)+3.774*x(11)+2.995*x(12)+3.237*x(13)+1.608*x(14);
nvars = 14; % Number of variables
LB = [0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05]; % Lower bound for (x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12 x13 x14)
UB = [1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1 1.1]; % Upper bound for (x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12 x13 x14)
A=zeros(20,14); b=zeros(20,1);
A(1,1)=+2.633; A(1,6)=-4.112; b(1)=-0.3; %first row
A(2,1)=-4.870; A(2,2)=+2.992; b(2)=-0.3; %second row
A(3,2)=+2.992; A(3,7)=-2.178; b(3)=-0.3; %third row
A(4,2)=-3.857; A(4,3)=+3.130; b(4)=-0.3; %fourth row
A(5,3)=-3.989; A(5,4)=+3.678; b(5)=-0.3; %fifth row
A(6,4)=-4.979; A(6,5)=+3.620; b(6)=-0.3; %sixth row
A(7,5)=-5.756; A(7,6)=+2.948; b(7)=-0.3; %seventh row
A(8,5)=-5.826; A(8,7)=+1.607; b(8)=-0.3; %eighth row
A(9,6)=+2.948; A(9,14)=-2.150; b(9)=-0.3; %nighth row
A(10,7)=+1.607; A(10,13)=-6.920; b(10)=-0.3; %tenth row
A(11,7)=-2.144; A(11,8)=+2.952; b(11)=-0.3; %eleventh row
A(12,8)=+2.952; A(12,9)=-5.365; b(12)=-0.3; %tweleventh row
A(13,9)=+3.348; A(13,10)=-4.863; b(13)=-0.3; %thirteenth row
A(14,10)=+3.680; A(14,11)=-5.073; b(14)=-0.3; %fourteenth row
A(15,11)=+3.774; A(15,12)=-3.774; b(15)=-0.3; %fiveteenth row
A(16,12)=+2.995; A(16,13)=-6.920; b(16)=-0.3; %sixteenth row
A(17,12)=+2.995; A(17,14)=-2.151; b(17)=-0.3; %seventennth row
A(18,8)=-4.288; A(18,13)=+3.237; b(18)=-0.3; %eighteenth row
A(19,1)=-4.870; A(19,14)=+1.608; b(19)=-0.3; %nighnteenth row
A(20,9)=-5.365; A(20,14)=+1.608; b(20)=-0.3; %twinty row
Aeq=[];
beq=[];
nonlcon=[];
IntCon=[];
rng default % For reproducibility
options = optimoptions('fmincon','Display','iter','Algorithm','sqp');
[x,fval,exitflag,output] = fmincon(fun,nvars,A,b,Aeq,beq,LB,UB,nonlcon,IntCon,options)
##### 2 CommentsShowHide 1 older comment
tahseen alshmary on 28 Nov 2018
how can i write it again for 1 column with 14 variables
can you write it please

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### Answers (1)

Walter Roberson on 28 Nov 2018
fmincon does not take aa nvars parameter . It takes an x0 parameter .
##### 12 CommentsShowHide 11 older comments
Walter Roberson on 29 Nov 2018
https://www.mathworks.com/help/matlab/math/parameterizing-functions.html

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