Having Trouble With Preallocating

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Bailey Smith
Bailey Smith 2018-6-18
编辑： Stephen23 2018-6-18
When I run my code:
clear; clc;
tic
x=(0:pi/1000000:pi);
m=zeros(1000000);
y=sin(x);
n=1;
L=length(x);
while n<L
m(n,1)=x(n);
m(n,2)=(y(n+1)-y(n))/(x(n+1)-x(n));
n=n+1;
end
m(n,1)=x(n);
m(n,2)=NaN;
toc
I get an error stating: Error using zeros Requested 1000000x1000000 (7450.6GB) array exceeds maximum array size preference. Creation of arrays greater than this limit may take a long time and cause MATLAB to become unresponsive. See array size limit or preference panel for more information.
What should I do about this? I would like to keep the while loops in there and just preallocate if possible. Thanks!

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Stephen23
Stephen23 2018-6-18
编辑：Stephen23 2018-6-18
m = zeros(1000000,2);
Although a better idea would be to preallocate with the exact required size:
L = numel(x);
m = zeros(L,2);

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