pmt = 'Enter a positive number: ';
num = str2double(input(pmt,'s'));
vec = [];
while num>0
vec = [vec,num];
num = str2double(input(pmt,'s'));
end
And tested:
Enter a positive number: 5
Enter a positive number: 3
Enter a positive number: 1
Enter a positive number: -1
>> vec
vec =
5 3 1
Note that I used the 's' option and wrapped input in str2double, which avoids the unnecessary risk of the user inputting arbitrary code (which would then be executed by input) or unsuitable values.
