Subscript indices must either be real positive integers or logicals. Error in erlang3 (line 4) erlang = lambda*exp​(-1*lambda​*xk)*(lamb​da*xk)^2/2​;

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vanitha usika
vanitha usika 2016-3-28
评论： Robert 2016-3-29
clc;
clear scr;
xk = rand(10000);
erlang = lambda*exp(-1*lambda*xk)*(lambda*xk)^2/2;
y = histogram(erlang,'Normalization','pdf');
subplot(2,1,1);
plot(xk,y);
% xlabel('X');
% ylabel ('Y');
title ('Erlang-3 Distribution');

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回答（3 个）

Robert
Robert 2016-3-28
Is there any chance you defined a variable exp before executing this code? My best guess (given the limited information provided) is that MATLAB is interpreting (-1*lambda*xk) as an indexing operation into the variable exp, which could happen if exp is not pointing to the function as you expect but is instead pointing to a variable.
  2 个评论
Robert
Robert 2016-3-29
Exactly; however, there is nothing stopping you from replacing exp for example
clear
exp(1)
exp(2)
exp = 42
exp(1)
exp(2)
As Walter suggested, you can use the command which to ask MATLAB from where it is getting exp
clear
which exp
exp = 42
which exp

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Star Strider
Star Strider 2016-3-28
The most likely possibility is that somewhere in your code you have a variable called ‘exp’. The solution is to find it and name it something else.
Walter Roberson
Walter Roberson 2016-3-28
At the command prompt command
dbstop if error
and run the code. When (if) it stops with the error, please report the results of
which exp

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