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Randomly return of a vector element. How to?

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Tasos Ampelas
Tasos Ampelas 2018-7-5
回答： dpb 2018-7-5
Hi everyone,
I have a vector A, of let's say, 30 elements.
I need Matlab (R2017b) to return the same element constantly and at random times return one of the rest elements, randomly chosen.
How can I do such a thing?
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Tasos Ampelas
Tasos Ampelas 2018-7-5
Thank you Dennis.
The ''if prob == 1'' gives the chance of the random pick right?
So if I write ''if prob == 2,5'' this will be 1 random pick in 4?
Dennis
Dennis 2018-7-5
编辑：Dennis 2018-7-5
randi only provides natural numbers (1,2,3,4). If you want a chance of 1 in 4 change the line above to
prob = randi(4);
short explanation:
prob = randi(4); %creates a random integer between 1 and 4 (1,2,3 or 4)
if prob ==1 % checks if the random integer is 1

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dpb
dpb 2018-7-5
ixFix = N; % set the particular element however is to be done...
iRet=[ixFix randperm(numel(A),1)]; % index vector of positions to return
B=A(iRet); % and get them...
Can, of course, eliminate temporaries shown for clarity if not needed for other purposes in the application.
B=A([N randperm(numel(A),1)]);

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