One Hot Encoder/Decoder in Octave/Matlab

label2mat.m

function mat = label2mat(label, size)

if ~exist('size', 'var') || isempty(size)
    size = 10;
end

if label > size
    error('Label (%d) should be < size (%d).', label, size);
end

I = eye(size);
mat = I(:, label);

end

mat2label.m

function label = mat2label(mat)

size = length(mat);

for i = 1:size
    if mat(i) == 1
        label = i;
        break;
    end
end

end