How to count the number of each character from a text file (and the frequency of it)?

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Esther Kis
Esther Kis 2016-3-28
评论： Amit Dubey 2020-6-2
Create a function that takes a text file as input and returns a vector of size 26 with the frequency in percent of each character a, b, . . . z (not sensitive to case.) The frequency must be computed as the number of occurences divided by the total number of characters from a to z that occur, multiplied by one hundred. All other letters such as ø and ä as well as all symbols must be ignored.

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2016-3-28
s=importdata('file.txt')
str=upper(s(:))
str=[str{:}]
AZ='A':'Z'
long=sum(ismember(str,AZ));
for k=1:numel(AZ)
freq(k,1)=100*sum(ismember(str,AZ(k)))/long
end

更多回答（3 个）

Mounic Kumar
Mounic Kumar 2019-6-25
function charnum = char_counter(fname,A)
fid = fopen(fname,'rt');
if fid < 0
charnum = -1;
return
end
if fid >0 && ischar(A)
k=0;
oneread = fgets(fid);
while ischar(oneread)
k = k + count(oneread,A);
oneread = fgets(fid);
end
charnum = k;
else
charnum = -1;
end
fclose(fid);
Amit Dubey
Amit Dubey 2020-5-15
编辑：Amit Dubey 2020-6-2
function n=char_counter(fname,character)
fid=fopen(fname,'rt');
if fid<0
n=-1;
return;
elseif ~ischar(character)
n=-1;
return;
end
end
c=0;
ol=fgets(fid);
while ischar(ol)
c=c+count(ol,character);
ol=fgets(fid);
end
n=c;
fclose(fid);
Priyamvada Shankar
Priyamvada Shankar 2019-3-23
编辑：Priyamvada Shankar 2019-3-23
Please Help me with this ..function called char_counter that counts the number of a certain character in a text file. The function takes two input arguments, fname, a char vector of the filename and character, the char it counts in the file. The function returns charnum, the number of characters found. If the file is not found or character is not a valid char, the function return -1. As an example, consider the following run. The file "simple.txt" contains a single line: "This file should have exactly three a-s..."
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Walter Roberson
Walter Roberson 2019-3-26
note: your function returns -1 if the character is valid but not found. Your function should only be returning -1 if the file is not found or if the input is not a valid scalar character.

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