Not enough input arguments in function? Help!!

I have the function

function z = funct(t,S)
z = 0.4*S-((0.4*S.^2)./10);

and

function euler(func,S0,dt,t0,tf)

% Time interval
t=t0:dt:tf;

% Loop using Euler's method
for i = 1:length(t)-1
    S(i+1) = S(i) + dt*(feval(func,t(i),S(i)));
end

t=t'
S=S'

plot(t,N)
xlabel('Time')
ylabel ('S')

when I type this into command window

euler(funct,7,.001,0,25)

I get this error

Not enough input arguments.

Error in funct (line 2)
z = 0.4*S-((0.4*S.^2)./10);

PLEASE HELP!!!!-

[jgg]

Are you sure you posted all your code? I can't replicate your error: I get that S is undefined in Euler, since you never declare it anywhere. If I correct it so S = S0 (to start) I then get another error about N.

Also I notice that funct doesn't use t at all.

Answer 1

[Walter Roberson]

Don't type that into the command window. Instead type

euler(@funct,7,.001,0,25)