How to make this string a = '(0 0 0)' into a double b = [0 0 0]?

Suppose I don't know what are the number inside the a string, it could be:

a = '(12 2.8 1.22)' % each number is separated by a single space

which should then be:

b = [12 2.8 1.22]

Answer 1

[Kevin Holly]

a = '(12 2.8 1.22)' 

a = '(12 2.8 1.22)'

a = strrep(a,')',']');
a = strrep(a,'(','[');
b = str2num(a)

b = 1×3

12.0000 2.8000 1.2200

[Wictor Oliveira]

Thank you so much!

Answer 2

[Fangjun Jiang]

a = '(12 2.8 1.22)';
b=sscanf(a,'(%f %f %f)')

b = 3×1

12.0000 2.8000 1.2200

b=transpose(sscanf(a,'(%f %f %f)'))

b = 1×3

12.0000 2.8000 1.2200

[Wictor Oliveira]

Great!!! Thank you very much!!!

[Walter Roberson]

This is more robust.