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1 | function index = subv2ind(siz,sub)
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2 | %SUBV2IND Linear index from subscript vector.
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3 | % SUBV2IND(SIZ,SUB) returns an equivalent single index corresponding to a
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4 | % subscript vector for an array of size SIZ.
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5 | % If SUB is a matrix, with subscript vectors as rows, then the result is a
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6 | % column vector.
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7 | %
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8 | % This is the opposite of IND2SUBV, so that
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9 | % SUBV2IND(SIZ,IND2SUBV(SIZ,IND)) == IND.
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10 | %
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11 | % See also IND2SUBV, SUB2IND.
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12 |
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13 | % Written by Tom Minka
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14 |
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15 | prev_cum_size = [1 cumprod(siz(1:end-1))];
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16 | %index = (sub-1)*prev_cum_size' + 1;
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17 | index = sub*prev_cum_size' - sum(prev_cum_size) + 1;
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