how can I change a character string from low case to upper case without using the formula of 'low()' and 'upper()' ?

Hi I´m trying to find the way of doing an algorithm in where I will need to change a character string from low case to upper case or vice versa the thing is that I dont want to to it through the formula that Matlab gives, I´m trying to do it manually without that formula, at this moment this is all the progress I have:

function outString = Revrselow(inString)

outString= '';

for idx=1:length(inString)
    outString = [outString inString(idx)];
     if double(inString(idx)) >= 97 && double(inString(idx)) <= 122
      ret= double(inString(idx)) >= 65 && double(inString(idx)) <= 90;
    end
end
end

Thanks in advance.

Answer 1

[Walter Roberson]

Subtract 32 from the character code. Which you might want to phrase as

variable - 'a' + 'A'