As it's a bit more elaborate than your previous question, it might be time to go for a regexp solution (even though you can always use STRFIND, SSCANF, etc).
Are these parameters listed in an increasing order? I.e. could we detect "parameter is" and get what follows iteratively, in order to build an array P whose 1st element is what you call P1, second element is what you call P2, etc?
I'm asking, because you could have a solution like
>> buffer = fileread('theFile.txt') ;
>> P = str2double(regexpi(buffer, '(?<=parameter is\s*)\d*', 'match'))
P =
1 5
If parameters are not ordered, we have to match them more specifically though.
