MATLAB: How to remove the error showing undefined function or variable

undefined function or variable

hello, i am using function block in matlab simulation .in that want to generate matrix X1 from matrix A

for j1=1:k2

for j2=1:m1

for j3=1:n1

X1(m1*(j1-1)+j2,j3)=A(j2,j3);

end

but executing code am getting error….

Undefined function or variable 'X1'. The first assignment to a local variable determines its class.

Function 'Subsystem9/Mtesting' (#53.2154.2156), line 66, column 16:

"X1"

Launch diagnostic report.

Best Answer

Preallocate X1 before the loop.

X1=zeros(m1*k2,n1);

Related Solutions

MATLAB: Failure in initial user-supplied objective function evaluation. FSOLVE cannot continue

Hi,

this runs - not sure if it is really efficient, but it works:

x0=[1,1,1,1,1];
fsolve(@F,x0)
function m=F(x)
syms  y1 y2 y3 y4 z1 k11 k12 k13 k14 l11 
h=1/1000;
f1(y1,y2,y3,y4,z1)=(-(z1^3)/(y3^2))*(3*(y2-y1+y3^(-1)-z1/10)^2+(1/5)*(y2-y1+y3^(-1)-(z1)/10))-y4;
f2(y1,y2,y3,y4,z1)=1/10*z1-y4;
f3(y1,y2,y3,y4,z1)=(z1^3)*(3*(y2-y1+y3^(-1)-z1/10)^2+(1/5)*(y2-y1+y3^(-1)-(z1)/10));
f4(y1,y2,y3,y4,z1)=y1-y3^(-1);
g(y1,y2,y3,y4,z1)=(y1-y3^(-1))^2+y4^2-1/10*z1;
J1(y1,y2,y3,y4,z1)=jacobian([f1,f2,f3,f4],[y1,y2,y3,y4]);
J1=double(J1(2,2,1,0,10));
J2(y1,y2,y3,y4,z1)=jacobian([f1,f2,f3,f4],z1);
J2=double(J2(2,2,1,0,10));
J3(y1,y2,y3,y4,z1)=jacobian(g,[y1,y2,y3,y4]);
J3=double(J3(2,2,1,0,10));
J4(y1,y2,y3,y4,z1)=jacobian(g,z1);
J4=double(J4(2,2,1,0,10));
k11=x(1);
k12=x(2);
k13=x(3);
k14=x(4);
l11=x(5);
k1=[k11;k12;k13;k14];
m(1)=double(h*(f1(2,2,1,0,10)+0.44*(J1(1,:)*k1 +J2(1,:)*l11))-k11);
m(2)=double(h*(f2(2,2,1,0,10)+0.44*(J1(2,:)*k1 +J2(2,:)*l11))-k12);
m(3)=double(h*(f3(2,2,1,0,10)+0.44*(J1(3,:)*k1 +J2(3,:)*l11))-k13);
m(4)=double(h*(f4(2,2,1,0,10)+0.44*(J1(4,:)*k1 +J2(4,:)*l11))-k14);
m(5)=double(g(2,2,1,0,10)+0.44*(J3*k1 +J4(1,:)*l11));
end

Best regards

Stephan

MATLAB: How to get intersection point of two curves

Try this:

syms Rb
R1=200;
R3=100;
R2=(R1+R3)/2;
theta=135;
Rb=vpasolve((tan(acos(Rb/R1))-tan(acos(Rb/R2))-(acos(Rb/R1))+(Rb/R2))*(180/pi)==180-theta,Rb);
disp(Rb)
alpha=(tan(acos(Rb/R2))-acos(Rb/R2))*(180/pi);
disp(alpha)
t=linspace(0,2*pi);
x1=Rb*(cos(t-alpha)+t.*sin(t-alpha));
y1=Rb*(sin(t-alpha)-t.*cos(t-alpha));
x2=R1*cos(t);
y2=R1*sin(t);
x1 = double(x1);
y1 = double(y1);
x2 = double(x2);
y2 = double(y2);
plot(x1,y1,x2,y2)
hold on
% q1=InterX([x1;y1],[x2;y2])
[D,I] = pdist2([x1;y1]',[x2;y2]','euclidean','Smallest',1);
[minD,idx] = min(D);
P = [x1(I(idx)); y1(I(idx))];
plot(x1,y1,x2,y2,P(1,:),P(2,:),'ro')

It uses the pdist2 function to return the smallest distance between the points in the two sets, approximating the intersection.

Best Answer

Related Solutions

MATLAB: Failure in initial user-supplied objective function evaluation. FSOLVE cannot continue

MATLAB: How to get intersection point of two curves

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