How can I create a vector of 10 random numbers?

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

Answer 1

[Thomas]

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]

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;