MATLAB: More than 580 billion possibilities

580 billion iterationsMATLAB

Is it possible to check more than 580 billion possibilities in matlab without getting out of memory.

Best Answer

Sure, for example,


count=0;
for i=1:580*1e9
    
    possibility=rand;
    
    if possibility>0.5
       count=count+1; 
    end
end

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MATLAB: How to plot billions of points efficiently

Here is one way to subsample the data to produce almost identical plots:

% Fake data:
X = 10.^randn(2e4,1);
Y = 10.^randn(2e4,1);
figure()
scatter(X,Y,'filled')
set(gca,'xscale','log','yscale','log','title','AllData')

% Merge data points:
Xb = log10(X);
Yb = log10(Y);
Xf = 0.05; % adjust factor to suit

Yf = 0.05; % adjust factor to suit
Xb = Xf*round(Xb/Xf);
Yb = Yf*round(Yb/Yf);
[~,idx] = unique([Xb,Yb],'rows');
figure()
scatter(X(idx),Y(idx),'filled')
set(gca,'xscale','log','yscale','log','title','SubData')

The number of points plotted:

>> numel(X) % AllData
ans =  20000
>> nnz(idx) % SubData
ans =  6653

You can also see that all extrema are still clearly visible.

PS: you might be able to save some memory by putting the merging onto one line:

[~,idx] = unique([Xf*round(log10(X)/Xf),Yf*round(log10(Y)/Yf)],'rows');

MATLAB: Possibility to add inputs

Hi Alberto,

You can find the documentation for bagOfFeatures here, where you can see that there are other arguments given along side the image.

Best Answer

Related Solutions

MATLAB: How to plot billions of points efficiently

MATLAB: Possibility to add inputs

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