counting vowels then removing them from a txt file

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Jake
Jake 2023-3-31
评论： Jake 2023-4-1
fid = fopen('sampletext.txt' , 'r');
vowel_set = 'aAeEiIoOuU';
vowels = 0;
non_vowels = [ ];
while x==1:length(sampletext.txt)
c = sampletext.txt;
if strfind(vowel_set, c)
vowels = vowels + 1;
else
non_vowels = [ non_vowels pos ];
end
end
m = sprintf('Found %d vowels.', vowels);
disp(m);
disp(['Message without vowels: ' message(non_vowels)]);
very new to code, not quite sure what im doing wrong. any help would be appreciated :)
  1 个评论
Les Beckham
Les Beckham 2023-3-31
You haven't actually read the file into Matlab. You just created a file pointer to it with fopen.
The fileread function is an easier way to read a text file into Matlab.
Also read the docs on regexp and regexprep. You can do this without a loop.
This doesn't do what you apparently think it does.
while x==1:length(sampletext.txt)
If you still want to do this with a loop, read about for and numel

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采纳的回答

Image Analyst
Image Analyst 2023-3-31
Sounds like homework. Here's a hint for how you can read in each line, one line at a time.
% Open the file for reading in text mode.
fileID = fopen(fullFileName, 'rt');
% Read the first line of the file.
textLine = fgetl(fileID);
lineCounter = 1;
while ischar(textLine)
% Print out what line we're operating on.
fprintf('%s\n', textLine);
% Read the next line.
textLine = fgetl(fileID);
lineCounter = lineCounter + 1;
end
% All done reading all lines, so close the file.
fclose(fileID);
You can also use readlines and ismember
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Image Analyst
Image Analyst 2023-3-31
编辑：Image Analyst 2023-3-31
Looks like you didn't try any of my suggestions. Try this:
% Demo by Image Analyst to count the number of vowels in a text file.
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
clear; % Erase all existing variables. Or clearvars if you want.
workspace; % Make sure the workspace panel is showing.
format short g;
format compact;
baseFileName = 'input.txt';
fullFileName = fullfile(pwd, baseFileName)
% Open the file for reading in text mode.
fileID = fopen(fullFileName, 'rt');
% Read the first line of the file.
textLine = fgetl(fileID);
lineCounter = 1;
vowel_set = 'aAeEiIoOuU';
numVowels = 0; % Number of vowels encountered so far.
numCharacters = 0; % Number of total characters encountered so far (vowels + non-vowels).
while ischar(textLine)
% Print out what line we're operating on.
fprintf('%s\n', textLine);
[isAVowel, vowelSetIndex] = ismember(textLine, vowel_set);
% Get the number of vowels in this line
numVowels = numVowels + sum(isAVowel);
% Count the total number of characters
numCharacters = numCharacters + numel(textLine);
% Create a new text line without the vowels
vowellessTextLine = textLine(~isAVowel);
% Read the next line.
textLine = fgetl(fileID);
lineCounter = lineCounter + 1;
end
% All done reading all lines, so close the file.
fclose(fileID);
fprintf('Of the %d characters in "%s", %d (%.2f%%) were vowels.\n', ...
numCharacters, baseFileName, numVowels, 100*numVowels/numCharacters)
Adapt as needed.

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更多回答（1 个）

Aditya Srikar
Aditya Srikar 2023-3-31
编辑：Aditya Srikar 2023-3-31
Hi Jake,
These are the few mistakes in your code :
1) fopen() is used to open a file. To read fata from the file, you have to use fscanf().
Below is the syntax to open and read data from a file.
fileID = fopen('sampletext.txt','r');
formatSpec = '%c';
data = fscanf(fileID,formatSpec);
Link to documentation
https://in.mathworks.com/help/matlab/ref/fopen.html
https://in.mathworks.com/help/matlab/ref/fscanf.html
2) The syntax of while loop is wrong.
Link to documentation - while loop
https://in.mathworks.com/help/matlab/ref/while.html
You can also use for loop to iterate over the string
for loop syntax to iterate over a string
data = 'abcd'
for c = data
disp(c)
end
Link to documentation - for loop
https://in.mathworks.com/help/matlab/ref/for.html
3) The syntax to access character of string at given position is
s = 'Welcome to MATLAB'
disp(['Character at 4th position is' s(4)])
4) You have not defined the function message() in your code.
But you have invoked message() in the last line.
Hope it helps.

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