index out of bounds because numel(x)=1

Question

wen 2014-10-26

0
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https://ww2.mathworks.cn/matlabcentral/answers/160159-index-out-of-bounds-because-numel-x-1

回答： Image Analyst 2014-10-26

Hi guys, I am writing a simple code to calculate probability of a two dimension t random number distribution with the Monte-Caro method as you can see. While there is error "Attempted to access x(2); index out of bounds because numel(x)=1." Many thanks for your help!

% MC estimate of probability
clear;clc;
n=10000;
x=trnd(6)*1+3;
y=trnd(6)*1+3;
%figure(1);
%plot(x,y,'r+')
c=0;s=0;
for i=1:n
    s=s+1;
    if 2<x(i)&&x(i)<4&&y(i)>4||x(i)>4&&y(i)>2 % inside the shadow
        c=c+1;
%        figure(2);
%        plot(x(i),y(i),'b+');
%        hold on;
    else % outside the shadow
%        figure(2);
%        plot(x(i),y(i),'r+');
    end   
end
p=c/s;
Attempted to access x(2); index out of bounds because numel(x)=1.
Error in normal (line 13)
    if 2<x(i)&&x(i)<4&&y(i)>4||x(i)>4&&y(i)>2 % inside the shadow