Running out of memory???

[babelproofreader]

Can anyone explain why the script below is failing with error message

error: memory exhausted or requested size too large for range of Octave's
index type -- trying to return to prompt
 

the script :-

clear

r2_critical_values_5=load("-ascii","r2_critical_values_5");

period = input( "Enter period length for sinewave: " );
sine_amp = input( "Enter sine amplitude: " );
trend_inc = input( "Enter incremental trend change: " );

sinevector=zeros(500,1)';
trendvector=zeros(500,1)';

for ii =2:500
 sinevector(ii)=sinevector(ii-1)+(360/period);
 trendvector(ii)=trendvector(ii-1)+trend_inc;
endfor

original_sine=sine_amp*(sin(sinevector.*(pi/180)));
trend_plus_sine=trendvector.+original_sine;

x = zeros(1:period)';
ydep = zeros(1:period)';
axis = (1:500)';
slope = zeros(1:500)';
r2 = zeros(1:500)';
sig_slope = zeros(1:500)';

for i=period:500

ydep=trend_plus_sine(i-(period-1):i,1)
[p,s]=polyfit(x,ydep,1);
slope(i,1)=p(1);
info=struct2cell(s);
sse=(cell2mat(info(5)))^2;
sst=sum((ydep.-mean(ydep)).*(ydep.-mean(ydep)));
r2(i,1)=(sst-sse)/sst;
if r2(i,1)>r2_critical_values_5(period)
sig_slope(i,1)=1;
endif

endfor

A=[axis,trend_plus_sine,slope,r2,sig_slope];
dlmwrite("calcs_output",A)

I can't believe that any of the arrays created exceed 2 GB of memory, or
that the memory on my computer is so limited that the script won't run - if
I had such limited memory my computer would be grindingly slow, which it
isn't?
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