concatenate all value in a matrix into one number

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Terek Li
Terek Li 2016-10-17
评论： Guillaume 2016-10-17
if I have a matrix [1 2 3 4], is there a quick and easy way to obtain 1234 ?

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Thorsten
Thorsten 2016-10-17
This works even if the numbers are not single digits, i.e., in in {1,2,...,9}
v = [10 20 4];
num = sscanf(sprintf('%d', v), '%f')
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Guillaume
Guillaume 2016-10-17
Indeed, however if they are single digits (as I assumed), conversion to string and back to number is going to be several order of magnitude slower than simple mathematical manipulation.
Not that it matters for such trivial code.

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Guillaume
Guillaume 2016-10-17
v = [1 2 3 4];
assert(all(v >= 0 & v < 10 & mod(v, 1) == 0), 'elements of v are not single digits');
sum(10.^(numel(v)-1:-1:0) .* v)

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