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Why do I keep getting the error message array indices must be positive integers or logical values?
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Array indices must be positive integers or logical values.
Error in Drift (line 12)
X(h) = X(0) + mu*h + sigma*Z;
for the following code...
T = 10;
N = 100;
h = T/N;
mu = 0.1;
sigma = 0.2;
X = zeros(1,N+1);
for k = 1:100
for i = 1:N+1
Z = normrnd(0,h);
X(h) = X(0) + mu*h + sigma*Z;
end
plot(Time,X);
hold on
end
1 commentaire
John D'Errico
le 27 Sep 2019
MATLAB has an index origin of 1, not 0. So X(0) will fail, and give you exactly that error.
Réponses (3)
John D'Errico
le 27 Sep 2019
MATLAB has an index origin of 1, not 0. So X(0) will fail, and give you exactly that error. (Matt pointed that out.)
But also
T = 10;
N = 100;
h = T/N;
...
X = zeros(1,N+1);
X(h) = X(0) + mu*h + sigma*Z;
What is h? h=10/100 = 0.1.
X is a vector. Can you index a vector at the 0.1 location? Where is that? Sort of between location 0 (which does not even exist in MATLAB anyway) and memory location 1?
Sorry. Start with the getting started tutorials. You need to learn how MATLAB does indexing.
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