How to change ASCII values?
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I have an assignment where I have to take a phrase, capitalize it, and use the 'double' command to change all of the letters to uppercase. I'm then supposed to loop through the resulting array of letters and change the ASCII values to values like: A=0 B=1 C=2, etc. The problem is that I've tried nearly everything to do that, but so far nothing is working. I was hoping that someone could point out what I am doing wrong and point me in the right direction. Thanks!
Here is what I have so far:
Star Strider on 25 Jan 2020
You are not using tthe result of the upper call.
u = upper(k)
y = double(u)
is more appropriate.
Allen on 25 Jan 2020
I simple way of converting characters values or character vectors to apply a numerical calculation directly to the characters.
k = 'Zoinks!';
y = upper(k)-0; % ASCII values for the uppercase versions of all characters. This includes "!" as well.
% Same as k = str2double(upper(k));
Since the ASCII value of A is 65, if you want to shift the values that are returned such that A = 0 you can do this at the same time you convert to ASCII values.
y = upper(k)-65; % Shifts ASCII values at the same time as converted so that A = 0;
If you need to remove punctuation from the characters you can use regular expressions to do this.
% Replaces anything that is not A-Z with an empty string (including whitespace characters) and converts
% to shifted ASCII values.
y = regexprep(upper(k),'[^A-Z]','')-65;