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1 | function sub = ind2subv(siz,index)
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2 | %IND2SUBV Subscript vector from linear index.
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3 | % IND2SUBV(SIZ,IND) returns a vector of the equivalent subscript values
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4 | % corresponding to a single index into an array of size SIZ.
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5 | % If IND is a vector, then the result is a matrix, with subscript vectors
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6 | % as rows.
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7 |
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8 | % Written by Tom Minka
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9 | % (c) Microsoft Corporation. All rights reserved.
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10 |
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11 | n = length(siz);
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12 | cum_size = cumprod(siz(:)');
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13 | prev_cum_size = [1 cum_size(1:end-1)];
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14 | index = index(:) - 1;
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15 | sub = rem(repmat(index,1,n),repmat(cum_size,length(index),1));
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16 | sub = floor(sub ./ repmat(prev_cum_size,length(index),1))+1;
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17 |
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18 | % slow way
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19 | %for dim = n:-1:1
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20 | % sub(:,dim) = floor(index/cum_size(dim))+1;
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21 | % index = rem(index,cum_size(dim));
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22 | %end
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