arrays - Return vector elements as a single integer

Question

In MATLAB, how can I return the contents of a vector as a single integer. For example, if a = [ 1 2 3 4 5 6 7 8 9 ], then I want a function that returns the number 123456789.

It's almost squeeze but removing all dimensions!!

My current solution is to read the vector as a string using sprintf with a format of '%i', then convert it to a number using str2double. That's ok if you only need to use it a few times, but fairly inefficient if it's being used 100000 times.

Answer 1

You can use

result = a*10.^(numel(a)-1:-1:0).';

or equivalently

result = sum(a.*10.^(numel(a)-1:-1:0));

They seem to be about equally fast.