how to find the total no of letters in a text file in matlab

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Muhammad Usman Saleem 2015-6-8

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评论： Walter Roberson 2016-9-23

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Hi ;

I am going to make a function called letter_counter that takes the name of a text file as input and returns the number of letters (i.e., any of the characters, a-to-z and A-to-Z) that the file contains. i have given that hint: You can use the built-in function isletter. If there is a problem opening the file, the function returns -1.

I am going that code but do not know what i am doing

function m=letter_counter(file)
fid=fopen(file,'rt')
m = char(fread(fid,inf));
fclose
if fid~=fopen(file,'rt')
    m=-1;
end
end

I am getting that error

Feedback: Your program made an error for argument(s) 'letter_counter.m'
      Your solution is _not_ correct.

I do not know what i have made. Please assist about the correct one. Thanks in advance for assistance...

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Kapil Dhanwani 2016-9-23

what to do if i want to count number of digits(0-9) not letter?

Walter Roberson 2016-9-23

You would read the help documentation for isletter() and check out the various routines mentioned in 'See Also'

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采纳的回答

Image Analyst 2015-6-8

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Your m is just all the bytes read. It's not taking into account that there are other characters like punctuation marks that they do not want counted. I don't see where you're checking if the character is in the range a-z or A-Z. Where are you doing anything like

letters = (m >= 'a' & m <= 'z') | (m >= 'A' & m <= 'Z');

That's why it's not giving the correct answer. Now do you know what letters above is? Do you know what you would do with that to count the valid letters?