Inserting a randomized array into a for loop

Question

Justin Brangiforte 2020-5-29

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/537091-inserting-a-randomized-array-into-a-for-loop

关闭： MATLAB Answer Bot 2021-8-20

Hey guys and girls I have been trying to insert an array that has been randomized by the randi and randperm command built into MATLAB. I then want to take each number in the array and run it through a series of if and elseif statements and then output that to a resutlant array. Thanks for the help

XA = [5 6 2 6 5 3 3 5 3 3 6 5];
for i = XA,length(XA)
if XA == 6
    Y = randi([2,4],1);
elseif XA == 5
    Y = randi([2,4],1);
elseif XA == 4
    Y = randi([5,6],1);
elseif XA == 3
    Y = randi([5,6],1);
elseif XA == 2
    Y = randi([5,6],1);
end
end

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KSSV 2020-5-29

What exactly you are trying? Can you show us the expected output?

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Answer 1

Adam Danz 2020-5-29

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https://ww2.mathworks.cn/matlabcentral/answers/537091-inserting-a-randomized-array-into-a-for-loop#answer_442355

编辑：Adam Danz 2020-6-2

No need for the conditional statements. Use indexing instead. Indexing is the life and blood of Matlab.

XA = [5 6 2 6 5 3 3 5 3 3 6 5];
y = nan(size(XA)); 
y(XA==6) = randi([2,4],1,sum(XA==6)); 
y(XA==5) = randi([2,4],1,sum(XA==5)); 
y(XA==4) = randi([5,6],1,sum(XA==4)); 
y(XA==3) = randi([5,6],1,sum(XA==3)); 
y(XA==2) = randi([2,4],1,sum(XA==2)); 

The lines above could be simplified further since many of them use the same randi ranges but this is a simpler way to see what's going on.