Hello Guys, i need to create a "big" Variable but my Memory(4GB) is not big enough so i want now to split it into some numbered .mat-Files. With this code i would have the Variable Buff with 6.765.201 rows and 4 columns:
Buff = zeros(numel(1350:2:1450)*numel(-150:2:-50)*numel(825:2:925)*numel(1225:2:1325),4);
Ctr = 1;
for step1 = 1350:2:1450 for step2=-150:2:-50 for step3=825:2:925 for step4=1225:2:1325
Buff(Ctr, 1) = step1; Buff(Ctr, 2) = step2; Buff(Ctr, 3) = step3; Buff(Ctr, 4) = step4;
Ctr = Ctr+1; end end end end
But i want that matlab create Buff with 1 to 500.000 rows and 4 columns into saving_Buff_001.mat then the next 500.000 to 1.000.000 rows and 4 columns into saving_Buff_002.mat and 1.000.000 to 1.500.000 to saving_Buff_003 and so on...
My idea was something like this, but matlab creates first the big variable and then starts splitting
idx = mod(Ctr-1,500000)+1; if idx == 500000 index = Ctr/500000; save(sprintf('saving_Buff_%03d.mat',index),'Buff'); end
Hope somebody can help my, big thanks
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In addition to memmapfile, there is also matfile, and you could put the whole thing in one file. No need to split into multiple files, as far as I can see, though I would recommend writing column-wise instead of row-wise
for i=1:4 matObj.Buff(:,i)=...; end
Thx for the informations. This was only a example, my Real Variable has 215.000.0000 rows and 4 columns and thats a very large Variable so i need a pre initialization of the Variable an the Splitting. So any ideas how to solve this Problem. Thanks