Not Enough Input Arguments in a Function
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Hi everyone. I download a code from a website to perform some calculations using the following ODE solver function:
function [dYfuncvecdW] = ODEfun(W,Yfuncvec);
Fa = Yfuncvec(1);
Fb = Yfuncvec(2);
Fc = Yfuncvec(3);
Fd = Yfuncvec(4);
p = Yfuncvec(5);
% Explicit equations
Ft = Fa + Fb + Fc + Fd;
k1a = 100;
k2c = 1500;
Cto = 0.2;
Ca = Cto * Fa / Ft * p;
Cb = Cto * Fb / Ft * p;
Cc = Cto * Fc / Ft * p;
r1a = 0 - (k1a * Ca * Cb ^ 2);
r1b = 2 * r1a;
rb = r1b;
r2c = 0 - (k2c * Ca ^ 2 * Cc ^ 3);
r2a = 2 / 3 * r2c;
r2d = -1 / 3 * r2c;
r1c = 0 - r1a;
rd = r2d;
ra = r1a + r2a;
rc = r1c + r2c;
v = 100;
Cd = Cto * Fd / Ft * p;
alpha = 0.0019;
Fto = 20;
if (W > 0.0001)
Scd = Fc / Fd;
else
Scd = 0;
end
% Differential equations
dFadW = ra;
dFbdW = rb;
dFcdW = rc;
dFddW = rd;
dpdW = 0 - (alpha / 2 / p * Ft / Fto);
dYfuncvecdW = [dFadW; dFbdW; dFcdW; dFddW; dpdW];
The problem is that is giving me the following error:
Not enough input arguments.
Error in ODEfun (line 2)
Fa = Yfuncvec(1);
At first, I thought that it was an error regarding a misspelled variable, but no. I do not what else to do. I would appreciate your help because I am a little bit rusty in Matlab.
回答（1 个）
Walter Roberson
2019-3-28
You appeared to have tried to run this function by clicking on the green Run button. You need to instead invoke it as part of an ode*() call such as a call to
ode45(@ODEfun, tspan, y_initial)
2 个评论
Arturo Zelaya Gealdinno
2019-3-28
Walter Roberson
2019-3-28
Create a separate .m that contains
tspan = [0 20]; %adjust to your actual time span
y_initial = [0 0 0 0 0]; %vector of length 5, adjust to your actual initial conditions
[t, Y] = ode45(@ODEfun, tspan, y_initial);
plot(t, Y(:,1))
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