How do you fix a 'function_handle' error?

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John Morabito
John Morabito 2019-5-3
回答： Jan 2019-5-3
I am trying to solve an IVP by using an ODESolver function that calls two other defined functions. I keep getting a message saying, "Undefined function 'ODESolver1' for input arguments of type 'function_handle'. " I don't know how to fix this.
Below is the ODESolver function that I have created
function[X,Y] = ODESolver1(Integrator,RHS,A,B,YA,DX)
NI = int64(((B-A)/DX)+1);%Number of Integration Steps
X = zeros(NI,1);
Y = zeros(NI,1);
%Initial Condition
X(1)=A;
Y(1)=YA;
for i = 1:NI-1
[X(i+1),Y(i+1)]=Integrator(X(i),Y(i),DX,RHS);
end
end
And now this is my script that keeps getting me function_handle errors
[X1,Y1] = ODESolver1(@Euler,@HK20,0,0.2,0.4,0.01)
[X2,Y2] = ODESolver1(@Euler,@HK30,0,0.2,0.4,0.01)
[X3,Y3] = ODESolver1(@Euler,@HK40,0,0.2,0.4,0.01)
figure (1)
plot(X1,Y1,X2,Y2,X3,Y3)
xlabel('Time')
ylabel('H Concentration')
legend('K20','K30','K40')
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John Morabito
John Morabito 2019-5-3
编辑：Jan 2019-5-3
This is my Euler function:
function [X,Y]=Euler(X0,Y0,DX,RHS)
F=RHS(X0,Y0);
Y=Y0+DX*F;
X=X0+DX;
end
And this is my concentration function:
function [F] HK20(t,L)
K = 20;
L = .4*exp(-K*t);
M = -K*L;
end
Jan
Jan 2019-5-3
There is a missing "=" in the definition of HK20()

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回答（1 个）

Jan
Jan 2019-5-3
Where is thze function ODESolver1 stored? In an M-files called "ODESolver1.m"? Is this stored in a folder, which is contained in the path? The error message means, that this function is not found, so either there is a typo in the file name or the parent folder is not contained in Matlab's path.

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