counting vowels then removing them from a txt file

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 :)

[Les Beckham]

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

Answer 1

[Image Analyst]

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

[Jake]

thanks for the reply.

not quite sure how to get it to count the vowels.i know that i can use an if else statement. but i dont know what to do to seperate the 2 of them ( vowels and consonants). you are correct about the homework part aswell.

fid = fopen('sampletext.txt' , 'r');

n = 0;

while ~feof(fid)

n = n+1;

tline = fgetl(fid);

fprintf('%d: %s\n' , n, tline);

end

fprintf('this text has %d lines' , n)

fclose(fid);

this is the code i wrote in the previous question that displays the text from each line and tells me how many lines. not sure if i could apply part of this to the next question...

[Image Analyst]

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.

[Jake]

thank you very much for your help!

Answer 2

[Aditya Srikar]

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.