counting How many times a letter apear in a notepad text?

I have a rather large text in a notepad and I want to find out how many times a certain letter is repeated in it.For example, I want to know how many times all the letters of the alphabet appears in that text and then I want to plot it, to show me something like that .

but the text is pretty big. it is a reference corpus.

[Stephen23]

@Armina Petrean: What have you tried so far?

[Armina Petrean]

[Armina Petrean]

This. BUT it doesn't take the whole text but only a piece of it. AND I NEED FOR ALL THE TEXT WHICH IS LARGER

[Rik]

But fileread returns the entire text file. What gives you the impression that something is missing?

[Armina Petrean]

when I change to lower case it gives me the same thing

[Armina Petrean]

and I want to do this for both types of letters and maybe also for numbers.

[Dyuman Joshi]

To clarify, you want to plot the frequency graph for Upper case letters, lower case letters and digits individually from a given text?

[Armina Petrean]

yes

Answer 1

[Rik]

txt = 'The quick broWn fox jUmps oVer the lazy dog 1 2 3 4 5 6 7 8 9 0';
Edges = double(['a':'z' 'A':'Z' '0123456789']) + [-0.5;0.5];
Edges = unique(Edges(:));
histogram(double(txt),Edges)

I will leave setting the XTickLabels for you. You can also use histcounts instead and create a bar graph with its output (so you can skip the values between 'Z' and 'a').