How to assign numbers to letters of the alphabet. Ex. A/a=1 B/b=2

As the title stated. I need to write a function where the input of a certain letter will give me the output of its corresponding number. (based off ASCII table)

Ex. someFunction (A)

ans = 1

someFunction (f)

ans = 6

Thanks for the help in advanced!

Answer 1

[Walter Roberson]

https://www.mathworks.com/help/matlab/ref/lower.html

https://www.mathworks.com/help/matlab/ref/ismember.html

https://www.mathworks.com/help/matlab/ref/switch.html

Answer 2

[Vladimir Sovkov]

The ASCII codes can be found with the function double

double('A');
65

If you want to get its ordinal number in the alphabet, use something like

k=double('A');
if k>64 && k<91
    k=k-64;
elseif k>96 && k<123
    k=k-96;
else
    disp('not a letter')
end