repalacement of string with phone numbers

Hi; I am going to attempt that question: Each number on older telephone keypads, except 0 and 1, corresponds to three uppercase letters as shown in this list: 2 ABC, 3 DEF, 4 GHI, 5 JKL, 6 MNO, 7 PRS, 8 TUV, 9 WXY A phone-number specification can include uppercase letters other than Q and Z, digits, the # and * signs, spaces, parentheses and dashes. Write a function called dial that takes as its input argument a string of any length that includes only these characters and returns as its output argument a string containing the corresponding telephone number with only digits, spaces, and the # and * signs. Specifically, it does not change the digits, the # and * signs, or the spaces, but it replaces each parenthesis with a space and each dash with a space, and it converts each uppercase letter to a digit according to the list shown above. Here is the input and output for one example of a call of the function: Input: '1 (FUN) DOG-4-YOU #2' Output: '1 386 364 4 968 #2' Note that in this example there are three spaces in the input string and seven spaces in the output string. If the input does not meet the phone-number specification given above, the function returns an empty array. You are not allowed to use the built-in function strrep. I have no idea how make such function? help me... Thanks

Answer 1

[Andrei Bobrov]

function out = funbyMuhammad(in_char)
    abc = ['()+-_',setdiff('A':'Z','QZ')];
    d = ['#*','0':'9',' '];
    if all(ismember(in_char,[abc,d]))
        ii = ['     ',sprintf('%d',kron(2:9,[1 1 1]))];
        [lo,idx] = ismember(in_char,abc);
        out = in_char;
        out(lo) = ii(idx(lo));
    else
        out = [];
    end
end

using

>> out = funbyMuhammad('1 (FUN) DOG-4-YOU #2')
out = 1  386  364 4 968 #2
>>

[Muhammad Usman Saleem]

@Andrei Bobrov thanks for contributions.Please can you tell me what question ask from me? what it demand from me. i am actually unable to understand that question..again thanks

[Muhammad Usman Saleem]

& please explain your code..

[Andrei Bobrov]

corrected

[Muhammad Usman Saleem]

@Andrei gets that error:

     Feedback: Your function performed correctly for argument(s) '1234567890'
      Feedback: Your function performed correctly for argument(s) 'ABCDEFGHI'
      Feedback: Your function performed correctly for argument(s) 'JKLMNOPRS'
      Feedback: Your function performed correctly for argument(s) 'TUVWXY'
      Feedback: Your function performed correctly for argument(s) '1-FUN DOG-4-YOU #2'
      Feedback: Your function performed correctly for argument(s) '1-800-FLOWERS'
      Feedback: Your function performed correctly for argument(s) 'A * IN OUR EYES'
      Feedback: Your function made an error for argument(s) 'Q IS NOT ALLOWED'

      Your solution is _not_ correct.

[Andrei Bobrov]

corrected 2

[Muhammad Usman Saleem]

(y) for corrected 2 @ Andrei Bobrov thanks.............. :-D please mark some comments on funOnMatlab function so that i can understand this question batter....

[Wasi von Deutschland]

Hi @Andrei Bobrov Could you please tell me if Q and Z are allowed in the exercise then how one can do it? such as number 7 'PQRS' and number 9 'WXYZ' and number 8 as rest will work.

Answer 2

[Jan Orwat]

You can try regular expressions:

>> regexprep('1A23D4',{'A','D'},{'2','3'})

ans =

122334

Answer 3

[liu yuhui]

Thank you very much.