# Error when using the function ODE45

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Stephanie Velasco on 24 Feb 2017
Edited: Walter Roberson on 25 Feb 2017
I have written to the following function to solve a differential equation using ODE 45, but i always seem to come across an error saying the "Inputs must be floats, namely single or double.". I am trying to solve for dt/dx,t(x)= 1/(a*x^(0.6)-b*x)), to find the time. but i get an error every time. since I have x in the equation idk what I'm doing wrong.
script
x_interval=[0.5 10];
t0 = [0];
[x,t] = Ode45(diff_,x_interval,t0);
function dt/dx = diff_(x,t)
a = 10;
b=0.5;
syms x;
t = (1/(a*x^(0.6)-b*x));
dt_dx =t;
end
##### 2 CommentsShow 1 older commentHide 1 older comment
Stephanie Velasco on 25 Feb 2017
I wasn't sure if this one was clear enough, Im sorry about that. Have a blessed day

John Chilleri on 25 Feb 2017
Hello,
You just need to change a few things:
Script - missing an @ symbol.
x_interval=[0.5 10];
t0 = 0;
[x,t] = ode45(@diff_,x_interval,t0);
Function - don't use sym and you have a / in the name.
function dt_dx = diff_(x,t)
dt_dx = (1/(10*x^(0.6)-.5*x));
end
I simplified your function, but you can leave it as,
function dt_dx = diff_(x,t)
a = 10;
b=0.5;
t = (1/(a*x^(0.6)-b*x));
dt_dx =t;
end
Hope this helps!
Stephanie Velasco on 25 Feb 2017
Thank you so much! Have a great day!