SWITCH expression must be a scalar or string constant.
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i changed up the file a bit to see if it would run the same and im still getting errors
tspan=[0 25];
y0=[0.1;0;0.2;0];
options=odeset('mass','M(t,y)');
switch options
case ''
M1=1;
M2=1;
g=9.81;
l1=1;
l2=1;
a=M2*9.81;
b=M1*9.81;
p=zeros(4,1);
p(1)=y0(2);
p(2)=-(b+a)*sin(y0(1))+M2*l2*(y0(4)^2)*sin(y0(3)-y0(1));
p(3)=y0(4);
p(4)=-a*sin(y0(3))-M2*l1*(y0(2)^2)*sin(y0(3)-y0(1));
m=p;
case 'mass'
M1=1;
M2=1;
g=9.81;
l1=1;
l2=1;
a=[1,0,0,0];
b=[0,(M1+M2)*l1,0,M2*l2*cos(y0(3)-y0(1))];
c=[0,0,1,0];
d=[0,M2*l1*cos(y0(3)-y0(1)),0,M2*l2];
m=[a;b;c;d];
otherwise
error(['unknown flag ''' flag '''.']);
end
[t,y]=ode113(m,tspan,y0,options);
subplot(2,1,1)
plot(t,y(:,1))
grid
xlabel('Time')
ylabel('Theta1')
subplot(2,1,2)
plot(t,y(:,3))
grid
xlabel('Time')
ylabel('Theta2')
SWITCH expression must be a scalar or string constant.
Error in GSFE (line 5) switch options
1 comentario
Respuestas (2)
the cyclist
el 12 de Ag. de 2015
Your variable options is a struct. A struct cannot be used in that way in a switch statement.
2 comentarios
Muthu Annamalai
el 12 de Ag. de 2015
Editada: Walter Roberson
el 12 de Ag. de 2015
Seems like the questioner is using odeset in wrong format; please refer to
Stephen23
el 12 de Ag. de 2015
Editada: Stephen23
el 12 de Ag. de 2015
@garrett schander: In fact referring to the documentation would resolve your other question too. Although beginners seem to be allergic to reading the documentation, it does actually explain how functions and operators should be used.
Walter Roberson
el 12 de Ag. de 2015
Like I said in another Answer, you are using R11 or earlier.
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