Selection with no direct repeatition

2020 4 22
2 个回答
回答已采纳
更新时间：2020 4 22
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0 个投票

Hello everyone,
I want to create 10 vectors with the following conditions:
Element number (i) is not equal to element number (i+1) and they have to be selected from set "a".
Length of each vector is 10 elements.
I am new to programming and I'd appreciate it if you can help me.
Here is me attempt:
%------------------------------------------------------------------------%
clear variables;
close all;
clc;
%------------------------------------------------------------------------%
%% variables definition
n=10;
a=[0 4/3 2];
n1=nan;
%------------------------------------------------------------------------%
%% memory allocation
%------------------------------------------------------------------------%
i1=zeros(1,n);
i2=zeros(1,n);
n1=zeros(1,n);
n2=zeros(1,n);
%------------------------------------------------------------------------%
%% selection process
for i=1:n
i1(i) = randi(length(a));
n1(i) = a(i1(i));
i2(i) = randi((length(a)-1)); % to provide better selection ( picking from 2 element instead of 3)
i2(i) = i2(i) + (i2(i) >= i1(i));
n2(i) = a(i2(i));
while (n1==n2)
n2(i) = a(i2(i));
end
n1=n2;
end
n2

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 采纳的回答

Hamzah Faraj
Hamzah Faraj 2020-4-22

0 个投票

idxr = randi(length(a),1,10); %// create the first batch of numbers
idx = diff(idxr)==0; %// logical array, where 1s denote repetitions for first batch
while nnz(idx)~=0
idx = diff(idxr)==0; %// logical array, where 1s denote repetitions for
%// subsequent batches
rN = randi(length(a),1,nnz(idx)); %// new set of random integers to be placed
%// at the positions where repetitions have occured
idxr(find(idx)+1) = rN; %// place ramdom integers at their respective positions
end
r=a(idxr);
end

更多回答（1 个）

Ameer Hamza
Ameer Hamza 2020-4-22

0 个投票

See randperm(): https://www.mathworks.com/help/releases/R2020a/matlab/ref/randperm.html
>> randperm(10)
ans =
2 3 9 7 5 8 10 6 4 1

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Hamzah Faraj
Hamzah Faraj 2020-4-22
hello Amer,
Thank you for your attempt to answer the question. However, this is not the right answer as this generates random numbers, but not from set a in the question.

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