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Not enough input arguments.

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Why do I get an error when create the M-File "Lorenz" with the following input:
function xprime = Lorenz(t,x);
%LORENZ: Computes the derivatives involved in solving the Lorenz equations
sig = 10;
beta = 8/3;
rho=28;
xprime=[-sig*x(1) + sig*x(2);rho*x(1)-x(2)-x(1)*x(3);-beta*x(3) +x(1)*x(2)];
The error says:
Error in Lorenz (line 6)
xprime=[-sig*x(1) + sig*x(2);rho*x(1)-x(2)-x(1)*x(3);-beta*x(3) +x(1)*x(2)];
  1 Comment
per isakson
per isakson on 9 May 2021
I get the error (R2018b)
Error using vertcat
Dimensions of arrays being concatenated are not consistent.
Error in Untitled2>Lorenz (line 11)
xprime=[-sig*x(1) + sig*x(2); rho*x(1)-x(2)-x(1)*x(3); -beta*x(3) +x(1)*x(2)];
Error in Untitled2 (line 4)
xprime = Lorenz( t, x );
I cannot see that this statement (Lorenz (line 6)) could throw the error "Not enough input arguments."
Show your full error message.

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Accepted Answer

per isakson
per isakson on 9 May 2021
Edited: per isakson on 9 May 2021
You need to call the function, Lorenz, with two input arguments: t and x. E.g.
%%
x = (1:6);
t = nan;
xprime = Lorenz( t, x )
In your case the variable, x, is not defined in the workspace of Lorenz. Thus, the expression cannot be evaluated. Don't ask me why the error message isn't more informative.

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