i encountered an error saying Undefined function 'Linda' for input arguments of type 'char', while trying save a file and run a code

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oluwatayo ogunmiloro 2019-6-16

0
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https://ww2.mathworks.cn/matlabcentral/answers/467338-i-encountered-an-error-saying-undefined-function-linda-for-input-arguments-of-type-char-while-t

关闭： MATLAB Answer Bot 2021-8-20

Function Y = linda_77
N=100; % Total population size
en=50; % plot every enth time interval
T=zeros(N+1,N+1); % T is the transition matrix, defined below
v=linspace(0,N,N+1);
p=zeros(time+1,N+1);
p(1,3)=1; % Two individuals initially infected.
bt=beta*v.*(N-v)/N;
dt=(b+gama)*v;
for i=2:N % Define the transition matrix
T(i,i)=1-bt(i)-dt(i); % diagonal entries
T(i,i+1)=dt(i+1); % superdiagonal entries
T(i+1,i)=bt(i); % subdiagonal entries
end
T(1,1)=1;
T(1,2)=dt(2);
T(N+1,N+1)=1-dt(N+1);
for t=1:time
y=T*p(t,:)’;
p(t+1,:)=y’;
end
pm(1,:)=p(1,:);
for t=1:time/en;
pm(t+1,:)=p(en*t,:);
end
ti=linspace(0,time,time/en+1);
st=linspace(0,N,N+1);
mesh(st,ti,pm);
xlabel(’Number of Infectives’);
ylabel(’Time Steps’);
zlabel(’Probability’);
view(140,30);
axis([0,N,0,time,0,1]);

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Answer 1

Walter Roberson 2019-6-16

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https://ww2.mathworks.cn/matlabcentral/answers/467338-i-encountered-an-error-saying-undefined-function-linda-for-input-arguments-of-type-char-while-t#answer_379400

MATLAB is case sensitive. That code would not be recognized as a function because you used Function instead of function

With that change made, this code would define a function named linda_77 . With the _77 that cannot match Linda even if you fixed the case sensitivity problem.

If you want this function to be invoked as Linda then you should change it to function Linda and store it in Linda.m