I need to take characters out of a string using isnan and str2double.

Basically I need to take out the numeric values out of a string using these functions. I keep trying but some of the characters still come out as numbers.

This is an example

a='281-890-8905';

o=length(a);

for k=1:o

    x=isnan(a(k));

    if x==0

    y=str2double(a(k));

    end
end

Answer 1

[Thorsten]

cellfun(@(x) sscanf(x, '%f'), regexp(a, '(\d+)', 'match'))

[Guillaume]

str2double(regexp(a, '\d+', 'match'))

will do the same and is arguably simpler.

[Rafael Perales]

This worked I just took out the plus sign to make it a single vector.Thank you

[Thorsten]

Thank you Guillaume for pointing this out.

Answer 2

[Jan]

Faster and simpler:

a = '281-890-8905';
s = a(a >= '0' & a <= '9') - '0';

Or:

s = a(isstrprop(a, 'digit')) - '0';