Character Frequency of String

I'm trying to figure out how to get groups and group counts for a string.

For example, if you input

string = "SunnyDay"

the output would be:

S: 1

U: 1

N: 2

Y: 2

D: 1

A: 1

[Stephen23]

https://web.archive.org/web/20220917155027/https://webcache.googleusercontent.com/search?q=cache:U0_xEuYfN8IJ:https://www.mathworks.com/matlabcentral/answers/1579409-character-frequency-of-string

[Paul]

I was quite curious as to how this Question popped up today as if it had been asked on 5 Nov 2021 with no activity since then. Any idea how that happened?

[Stephen23]

"Any idea how that happened?"

Because of Kuchi's comment.

Answer 1

[Paul]

Using the new dictionary in 2022b and the on-point example from this blog post

str = "SunnyDay";
chr = char(str);
d = dictionary(string.empty,double.empty);
for c = chr
    if isKey(d,c)   % If this char exists in the dictionary
        d(c) = d(c) +1;   % Increment the value associated with that char by 1.
    else
        d(c) = 1;   % Initialise a new char in the dictionary with the value set to 1.
    end
end
d

d = 
  dictionary (string ⟼ double) with 6 entries:

    "S" ⟼ 1
    "u" ⟼ 1
    "n" ⟼ 2
    "y" ⟼ 2
    "D" ⟼ 1
    "a" ⟼ 1

I tried making the dictionary key a char, but that resulted in an error.

Answer 2

[Sayan]

str = "SunnyDay";

chr = char(str);

d = dictionary(string.empty,double.empty);

for c = chr

if isKey(d,c) % If this char exists in the dictionary

d(c) = d(c) +1; % Increment the value associated with that char by 1.

else

d(c) = 1; % Initialise a new char in the dictionary with the value set to 1.

end

end