A weird blank matrix....

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Emma Humphrey
Emma Humphrey 2018-10-18
回答： Walter Roberson 2018-10-18
Hello all, I am new to matlab and trying to figure out the following code. As you can see I have commented out the line in question and marked it. Apart from preallocation, I fail to see the point in the code Xu as it doesn't appear to affect the final result.
Many thanks
hold on
title('Plot of uniform random numbers')
Xu = [];
for i=1:nn
x = rand(mm,2) %create a random 2 column matrix of numbers
%Xu = [Xu;x] %what does this do?
plot(x(:,1),x(:,2),'*');
end

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回答（1 个）

Walter Roberson
Walter Roberson 2018-10-18
It does not affect the final plotted result. It does, however, keep a record of all of the x values that were generated, in case you want them later.

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