MATLAB: Question about single digits.

single digits

Hi everyone. Is there any function that converts "complex" number for example [123] to constituent elements [1 2 3] ?

Its not the most elegant, but this works:

A = str2num(num2str(123)')'

Question 1:

perms(1:3) * [100; 10; 1]

Or the general case:

v = [2,5,4,8];
r = perms(v) * 10.^(numel(v)-1:-1:0).'

The multiple conversions by str2double, cellstr, and int2str are too indirect. If you want to work with numbers, stay at working with numbers.

If speed matters, replace perms by FEX: VChooseKO, which is about 10 times faster.

In your loop move the calculation of the power of 10 outside the loop.

a=[1 2 3 4 5];
b=str2double(sprintf('%d',round(a)));

Another method would be to use positional information:

a=[1 2 3 4 5];
b=sum(a.*10.^((length(a)-1):-1:0));

This second method will often work better, but if values larger than 9 are present in a, this will not return the result you might mean.