How can I create a vector of 10 random numbers?

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I am looking to create a vector of 20 random numbers and then use 10 othjer random numbers to replace 10 of the data points with NaN

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Answer 1

Thomas 2012-10-22

编辑：Thomas 2012-10-22

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IS this what you need

A=rand(20,1)   % 20 random numbers use rand or randn
b=randi(20,10,1) % randomly choose 10
A(b)=NaN     % replace those 10 chosen above with NaN's

Answer 2

Kye Taylor 2012-10-22

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If you use an approach like

x = rand(20,1);
idx = randi(20,10,1);
x(idx) = NaN,

you may replace less than ten numbers since there may be repeated integers in idx.

If you need to replace exactly 10 numbers every single time, try

x = rand(20,1);
idx = randperm(20);
x(idx(1:10)) = NaN;