Disk space eaten up

vej samwedge at gmail.com
Sat Feb 2 05:54:02 CST 2008


Hello!

I'm not sure if this is a bug since it only occurs when I kill the Octave
process but I'd appreciate your help in this matter. If anyone tells me it's
a bug then I apologise and I'll post in the bug section.

I have two simple scripts. One performs a simple monte carlo integration
with N random numbers, and the other sends in values of N into the first and
plots a graph (value on integral vs N) to show that precision is improved
for larger N values.

I first set up my scripts to plot around 10000 different points which took
such a long time I decided to kill the process and start again with fewer
points. The second time I did it (with fewer points) it stalled halfway
leaving me with no option but to kill Octave this time as well. It turned
out that it stalled because of a lack of diskspace. Octave had been taking
up disk space which it normally gave back to me when I quit, but since the
Octave process was killed on both occasions it didn't. I now have 1.5Gb
missing somewhere on my hard drive.

Shouldn't Octave delete any temp files when it is restarted?

I've looked for my 1.5Gb in /tmp, every directory and sub-directory with
'octave' in the name and in my home folder with no luck. I have also tried
the usual reboot of my computer and restarting Octave.

Anyone know where the diskspace is being eaten up?

I really appreciate your time reading this.

Thanks in advance.

Sam

ps. Useful information:

Octave version 2.9.9 (i686-redhat-linux-gnu)

OS: Fedora 7

Here are my scripts:

vectorMC.m
function MCint = vectorMC(N)
x=rand(1,N+1);
y=e.^x;
yMC=(e^1)*rand(1,N+1);
check=(yMC<=y);
Ninside=sum(check);
MCint=(e^1)*Ninside/N;
end


p1mccon.m
for i=100:10:5000;
x=i;
y=vectorMC(i);
plot(x,y,'o')
hold on
end
grid on
plot([0 5000],[(e^1-1) (e^1-1)])
xlabel('The total number of random points')
ylabel('Value of integral')
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