Error using odearguments (line 113) Inputs must be floats, namely single or double.

code concerned is as below

%%

format long,qgin,c_g_in,c,c_l_in,vg,vl,m,ql,v_max,v,xp,yxco,yxh2,mu,kd,c0,c0g,ngout,qgout;
qgin=12.000;
c_g_in=[1.000 2.000 3.000 4.000 5.000 6.000 ];
c=zeros(13,1);
c_l_in=[1.000 3.000 5.000 7.000 3.000 5.000];
vg=27.000;
kla=[13.000 34.000 5.000 6.000 7.000 7.000 ];
vl=65.000;
m=[23.000 3.000 5.000 2.000 1.000 4.000];
ql=123.000;
v_max=[1.000 2.000 3.000 5.000 7.000 1.000];
for i=1:6
    v(i)=-v_max(i).*c(i);
end
xp=45.000;
yxco=3.000;
yxh2=5.000;
mu=-v(1)*yxco-v(2)*yxh2;
kd=15.000;
c0=[1.000 2.000 3.000 0.000 0.000 0.000 0.000 0.000 0.000 2.000 5.000 6.000 13.000];
c0g=c0(1:6);
ngout=qgin*sum(c_g_in,'all')-kla(1)*((c(1)/m(1))-c(7))*vl-kla(2)*((c(2)/m(2))-c(8))*vl-kla(3)*((c(3)/m(3))-c(9))*vl+kla(4)*((c(10)/m(4))-c(4))*vl+kla(5)*((c(11)/m(5))-c(5))*vl+kla(6)*((c(12)/m(6))-c(6))*vl;
qgout=ngout*R*t/(sum((psat.*c0g),'all'));
f=@(t,c)[((qgin.*c_g_in(1)-qgout.*c(1))./vg)-kla(1).*(vl/vg).*((c(1)./m(1))-c(7)), 
        ((qgin.*c_g_in(2)-qgout.*c(2))./vg)-kla(2).*(vl/vg).*((c(2)./m(2))-c(8)),
        ((qgin.*c_g_in(3)-qgout.*c(3))./vg)-kla(3).*(vl/vg).*((c(3)./m(3))-c(9)),
        ((qgin.*c_g_in(4)-qgout.*c(4))/vg)+kla(4).*(vl/vg).*((c(10)./m(4))-c(4)),
        ((qgin.*c_g_in(5)-qgout.*c(5))/vg)+kla(5).*(vl/vg).*((c(11)./m(5))-c(5)),
        ((qgin.*c_g_in(6)-qgout.*c(6))/vg)+kla(6).*(vl/vg).*((c(12)./m(6))-c(6)),
        ((ql/vl).*(c_l_in(1)-c(7))+kla(1).*((c(1)./m(1))-c(7))+v(1).*c(13)),
        ((ql/vl).*(c_l_in(2)-c(8))+kla(2).*((c(2)./m(2))-c(8))+v(2).*c(13)),
        ((ql/vl).*(c_l_in(3)-c(9))+kla(3).*((c(3)./m(3))-c(9))+v(3).*c(13)),
        ((ql/vl).*(c_l_in(4)-c(10))-kla(4).*((c(10)./m(4))-c(4))+v(4).*c(13)),
        ((ql/vl).*(c_l_in(5)-c(11))-kla(5).*((c(11)./m(5))-c(5))+v(5).*c(13)),
        ((ql/vl).*(c_l_in(6)-c(12))-kla(6).*((c(12)./m(6))-c(6))+v(6).*c(13)),
        ((ql/vl).*(-c(13).*xp)+mu.*c(13)-kd.*c(13))]
tspan=[0 600];
[t,c]=ode45(f,tspan,c0);

error is as follows

Error using odearguments (line 113)
Inputs must be floats, namely single or
double.

Error in ode45 (line 115)
  odearguments(FcnHandlesUsed,
  solver_name, ode, tspan, y0, options,
  varargin);

Error in gshs (line 39)
[t,c]=ode45(f,tspan,c0);

Answer 1

[Jan]

What is the purpose of this line:

format long,qgin,c_g_in,c,c_l_in,vg,vl,m,ql,v_max,v,xp,yxco,yxh2,mu,kd,c0,c0g,ngout,qgout;

It should fail, because these variables are not defined before.

When I run your code without this line, I get an error here:

qgout=ngout*R*t/(sum((psat.*c0g),'all'));
% Undefined function or variable 'R'.

I guess that you have defined these variables as symbolic.

[Sumeet Sinha]

Using the latest version there is no change in errors for this line

format long,qgin,c_g_in,c,c_l_in,vg,vl,m,ql,v_max,v,xp,yxco,yxh2,mu,kd,c0,c0g,ngout,qgout;

And there is no effect orchange in error even after defining R

R=8.314

[Sumeet Sinha]

format long,qgin,c_g_in,c,c_l_in,vg,vl,m,ql,v_max,v,xp,yxco,yxh2,mu,kd,c0,c0g,ngout,qgout;

this line even after getting omitted has no change and the purpose was to get rid of this error

Error using odearguments (line 113)
Inputs must be floats, namely single or
double.

[Jan]

It is your turn to find out, which variables are no floats. I cannot guess this, but you can check this using the debugger.