how to read specified letters from ascii file

i want prgrm that reads ascii file but only the letters 'a' to 'z' using ascii code 97:122 and i want to put those letters in new file and save them

[Walter Roberson]

What do you want the program to do at the moment that it is about to read the next character and the next character (that it has not yet read) is not one of those characters ? Your question says that it cannot even read the character to determine whether it is one of the characters you are interested in.

[narimen boucenna]

you see i tried using this

A= fread(fileID,'*char')

but it reads , and . and other things i just want a to z only and since there is a code ascii for every letter for example ( A is 97 ) i want to use that code

[Walter Roberson]

Until it has read a character, how can it know whether to read the character or not?

How about if the program reads all of the characters but only saves the ones in the range you indicated?

[narimen boucenna]

show me the prgrm that u r talking abt it might work and thnx for ur time

[Rik]

Why don't you try one of the examples in the documentation, or one of the files on the File Exchange, or one of the hundreds of examples you can find with Google/Yahoo/duckduckgo/Bing?

[narimen boucenna]

i did actually nothing that i could find usefull

[Rik]

I just googled 'read ascii text file to char array matlab'. The top 3 results all suggest the fileread function.

Answer 1

[Voss]

inputFileName = 'C:\input.txt';
outputFileName = 'C:\output.txt';

fileID = fopen(inputFileName,'r');
A = fread(fileID,'*char');
fclose(fileID);

A = A(A >= 97 & A <= 122); % using logical indexing to keep only 'a' to 'z'

fileID = fopen(outputFileName,'w');
fprintf(fileID,'%s',A);
fclose(fileID);

[Walter Roberson]

We recommend against providing complete solutions for homework problems.

[narimen boucenna]

thnx for the progrm it really helped me when i opend the new file i found what i was looking for

Answer 2

[Image Analyst]

Try this:

% chr = fileread('test1.m') % Whatever file you want to read in.
chr = '123456abcdef ABCDEF 789.'  % String for testing.
TF = isstrprop(chr,'alpha')
newChr = chr(TF)

[Walter Roberson]

This will grab upper case as well as lower case.

[narimen boucenna]

unfortunately it didnt work the result was

abcdefABCDEF

and its not what i was looking for but thnx for the help i really appreciate it