how to read specified letters from ascii file

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narimen boucenna
narimen boucenna 2020-7-2
评论： narimen boucenna 2020-7-3
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
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Rik
Rik 2020-7-2
I just googled 'read ascii text file to char array matlab'. The top 3 results all suggest the fileread function.

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Voss
Voss 2020-7-2
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);
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Walter Roberson
Walter Roberson 2020-7-2
We recommend against providing complete solutions for homework problems.
narimen boucenna
narimen boucenna 2020-7-3
thnx for the progrm it really helped me when i opend the new file i found what i was looking for

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更多回答（1 个）

Image Analyst
Image Analyst 2020-7-2
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)
  2 个评论
narimen boucenna
narimen boucenna 2020-7-3
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

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