??? Undefined function or method 'times' for input arguments of type 'function_handle'.

Hi! I'm having trouble with some of my code. I believe that my functions are not being evaluated properly so i'm getting this error message

??? Undefined function or method 'times' for input arguments of type
'function_handle'.

My code is:

Et=@(t)4*t*exp(-2*t/tbar)/tbar^2;
cCt=@(y)4/3.*(cAo-y(3))-2/3.*(cBo-y(4));

concs=@(t,y)[y(3).*Et;
             y(4).*Et;
             -k1.*y(3).*y(4);
             -0.5.*k1.*y(3).*y(4)-1.5.*k2.*y(4).*cCt];
[T,Y] = ode45(concs,[0 tbar*10],[cAo cBo 0 0]);

tbar, cAo cBo, k1, k2 are defined as scalars elsewhere. I think that my problem lies in the cCt function or maybe the Et function...

Thanks for your help.

PY

Answer 1

[Seth DeLand]

Patrick,

I believe that when you make calls to the functions inside of concs, you need to include the arguments for those functions. Should look something like:

 concs=@(t,y)[y(3).*Et(t);
              y(4).*Et(t);
              -k1.*y(3).*y(4);
              -0.5.*k1.*y(3).*y(4)-1.5.*k2.*y(4).*cCt(y)];

Answer 2

[Patrick Young]

thanks!