ode45 with an input

I'd like to integrate a function with a variable that is taken from the user. For example, to integrate the function below:

function dydt = test(t,y)
dydt = -t*y/sqrt(2-y^2);

,I would call it with something like [t,y] = ode45('test',[0:0.1:5],1), but if I want to integrate dydt = -ty/sqrt(2-y^2)*b, where b is taken from the user, how would I do that?
Here's what I've tried:

function dydt = test(t,y,b)
dydt = -ty/sqrt(2-y^2)*b;

,and calling it with [t,y] = ode45('test',[0:0.1:5],1,3), where b = 3 in the call, but it's giving me an error. Is there a way to integrate a function with a variable that is taken from the user?

Answer 1

[Azzi Abdelmalek]

tspan=[0:0.1:5]
[T,Y] = ode45(@(t,y),test(t,y,b),tspan,y0)

[Jan]

Some tiny modifications:

tspan = 0:0.1:5;  % This is a vector already
b     = 23.4;     % Define b as wanted
[T,Y] = ode45(@(t,y) test(t,y,b), tspan, y0);  % One comma removed

Answer 2

[Jan]

See http://www.mathworks.de/matlabcentral/answers/1971