Error: Subscript indices must either be real positive integers or logicals.

Question

dpr 2012-3-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/31119-error-subscript-indices-must-either-be-real-positive-integers-or-logicals

I have the following code and I am having this error

Subscript indices must either be real positive integers or logicals.
Error in ==> Markov_Chain at 64
cur_state = Rand_Vect(P(cur_state,:), 1);

How should I solve it?

Thanks

function [Chain] = Markvok_Chain( P, initial_state, n )
    P = [ 0.85 0.15; 0.05 0.95 ];
    initial_state = [0.4 0.6];
    n=20;
    sz = size(P);
    cur_state = round(initial_state);
%
% Verify that the input parameters are valid
%
if (sz(1) ~= sz(2))
   error('Markov_Chain:  Probability matrix is not square');
end
num_states = sz(1);
if (cur_state < 1) | (cur_state > num_states)
   error('Markov_Chain:  Initial state not defined in P')
end
for i=1:num_states
   if (sum(P(i,:)) ~=1 )
      error('Markov_Chain:  Transition matrix is not valid')
   end
end
%
% Create the Markov Chain 
Chain(1,1:2) = cur_state;
for i = 1:n
     cur_state = Rand_Vect(P(cur_state,:), 1);
     Chain(i,1:2) = cur_state;
end

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Daniel Shub 2012-3-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/31119-error-subscript-indices-must-either-be-real-positive-integers-or-logicals#answer_39589

在 MATLAB Online 中打开

Look at the error and then look at your code. Basically you have

cur_state = round([0.4 0.6]);

which is the same as

cur_state = [0, 1];

Now the error says "real positive integers or logicals". Since cur_state is not a logical array, all of its elements must be real positive integers, but 0 is not a positive integer.