how can i convert a string to a number (without using the str2num function) so if the string represents a number the value is 1? (otherwise the value is 0)...

for example:

st = '23487';

r = 1;

(also '00023487' is acceptable or any number of leading zeros).

but

st = '-4e';

r = 0;

[Daniel Shub]

I am closing this question. Please edit it to include what you have tried so far.

Answer 1

[Arthur]

r = ~isnan(str2double(st));

Answer 2

[Azzi Abdelmalek]

a='1.3125';
r=numel(regexp(a,'[0-9.]'))==numel(a)