Write a function called digit_counter that takes the name of a text file as input and returns the number of digits (i.e., any of the characters, 0-to-9) that the file contains. If there is a problem opening the file, the function returns -1

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Kapil Dhanwani 2016-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/304267-write-a-function-called-digit_counter-that-takes-the-name-of-a-text-file-as-input-and-returns-the-nu

评论： Walter Roberson 2018-5-13

function[c]=digit_counter(filename)
fid=fopen(filename,'rt');
if fid<0
    error('error opening file %s', filename);
end
A = char(fread(fid,inf)).';
c=length(A);
fclose(fid);
end

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Answer 1

Walter Roberson 2016-9-23

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Your code returns the number of bytes in the file. The requirements are that it return the number of digits in the file -- that is, the total number of occurrences of any of the characters '0', '1', '2', '3', '4', '5', '6', '7', '8', or '9'

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Kapil Dhanwani 2016-9-23

Yes I want digits only...no alphabets and no space so what changes I should make

Walter Roberson 2016-9-23

在 MATLAB Online 中打开

Hint:

if A(idx) == '0'
  digit0 = digit0 + 1;
elseif ....

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Answer 2

Srishti Saha 2018-5-13

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在 MATLAB Online 中打开

A simple function as this would work:

function n = digit_counter(fname)
    n = -1;
    fid = fopen(fname,'r');
    if fid >= 0
        n = sum(isstrprop(fread(fid,inf,'char=>char'),'digit'));
        fclose(fid);
    end
end