same code but with different behavior each time

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huda nawaf
huda nawaf 2011-12-3
I have file with large length (2444546), so I segmented it into 2 parts,each part with length(1222273).With total length i got out of memory and run this code:
fid = fopen('d:\matlab\r2011a\bin\flixsterdata\finalflix0.txt','r');
c = textscan(fid,'(%d,%d)\t%d')
c1=c{1};c2=c{2};c3=c{3};
LL=length(c1)
L=round(LL/2)
w=double(c1(1:L)); w1=double(c2(1:L)); w2=double(c3(1:L));
flix0=accumarray([w,w1],w2);
[m,n]=size(flix00);
f=fopen('flix00.txt','w');
for i=1:m
for j=1:n
fprintf(f,'%d',flix00(i,j));
end
end
fclose all
I ran this code for the first part, and no problem
But when I ran the same code for the second part , where start from 1222274(code below), I got this error:
??? Error using ==> accumarray
Out of memory. Type HELP MEMORY for your
options.
Error in ==> g at 8 flix0=accumarray([w,w1],w2);
the same code and for the same size of file , but it's behavior is different
fid = fopen('d:\matlab\r2011a\bin\flixsterdata\finalflix0.txt','r');
c = textscan(fid,'(%d,%d)\t%d','headerLines', 1222274); c1=c{1};
c2=c{2};c3=c{3}; LL=length(c1) L=round(LL/2) w=double(c1(1:L));
w1=double(c2(1:L)); w2=double(c3(1:L));
flix0=accumarray([w,w1],w2);

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回答（1 个）

Walter Roberson
Walter Roberson 2011-12-3
Like I told you before, use %f format in doing your reads, and skip the double() step. You should be avoiding making copies of your input.

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