How can i write a MATLAB function named dedbi that takes input xtx as string and returns another string xtxx as output.

Question

dedbi reverse the words that is, ‘a’ will be replaced by ‘z’, ‘b’ will be replaced by ‘y’, ‘c’ will be replaced by ‘x’ and so on. dedbi will do the same for capital letter t

Answer 1

Here's a way to do that:

alphabet = 'abcdefghijklmopqrstuvwxyz';
ALPHABET = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
ralphabet = fliplr(alphabet);
RALPHABET = fliplr(ALPHABET);

txt = 'abc d ?!.< n AC';

[~, index] = ismember(txt,alphabet);
target  = index ~= 0;
src     = index(target);

[~, INDEX] = ismember(txt,ALPHABET);
TARGET  = INDEX ~= 0;
SRC     = INDEX(TARGET);

txtInvert = txt;
txtInvert(target) = ralphabet(src);
txtInvert(TARGET) = RALPHABET(SRC);

Output:

zyx w ?!.< n ZX