Error using the randi function
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Here is my code:
function EPS
Score=zeros(1,20);
X=[0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1];
for j=1:20
Dealer=X(randi(numel(X)));
if sum(X)-.5*length(X)==0
Pick=X(randi(numel(X)));
else
if sum(X)>size(X)
Pick=1;
if sum(X)<size(X)
Pick=0;
end
end
end
if Pick==Dealer
Score(j)=1;
end
X=X(X~=Dealer);
end
disp(sum(Score)/20);
end
When I run this I get an error on line 11 (Dealer variable as the for loop is line 10): Error using randi First input must be a positive scalar integer value IMAX, or two integer values [IMIN IMAX] with IMIN less than or equal to IMAX.
If I define X as I did in my code and in my command window type X(randi(numel(X))) I do not get an error.
Why is my code giving me the error if in the command window it is working?
3 个评论
KSSV
2017-8-24
This line:
X=X(X~=Dealer);
gives a empty matrix after few loops....so randi(emptymatrix) popping error.
Walter Roberson
2017-8-24
Right. You have multiple equal values so X(X~=Dealer) is deleting multiple entries, all of the duplicates of Dealer. You only have two unique values in X, so after the second time you execute the line you would have deleted everything out of X.
Perhaps you should instead keep track of the random index and delete only that one item.
Tony
2017-8-26
采纳的回答
KSSV
2017-8-24
Score=zeros(1,20);
X=[0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1];
for j=1:20
idx = randi(numel(X)) ;
Dealer=X(idx);
if sum(X)-.5*length(X)==0
Pick=X(randi(numel(X)));
else
if sum(X)>size(X)
Pick=1;
if sum(X)<size(X)
Pick=0;
end
end
end
if Pick==Dealer
Score(j)=1;
end
X(idx) = [] ;
end
disp(sum(Score)/20);
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