Each number on telephone keypads, except 0 and 1, corresponds to a set of uppercase letters as shown in this list: 2 ABC, 3 DEF, 4 GHI, 5 JKL, 6 MNO, 7 PQRS, 8 TUV, 9 WXYZ Hence, a phone-number specification can include uppercase letters and digits.

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Emma Sellers 2019-1-3

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回答： RAMAKANT SHAKYA 2019-2-7

I can not quite figure out why my code does not perform. I keep getting syntax errors that dont make sense to me. Such as "parse errors"

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Star Strider 2019-1-3

Please copy and paste your code from your Editor window to a Comment here.

Pictures of code are like pictures of food — enticing but not nourishing.

Emma Sellers 2019-1-3

在 MATLAB Online 中打开

function [telephone] = dial(up)
characters = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
numbers = '012345678922233344455566677778889999';
[boolean,coords] = ismember(up,characters);
telephone = sscanf(numbers(coords), '%lu'); 
for i = 1 : sizeof(up) 
    if  boolean(i) = 0 
        telephone = [];
    end
end 
end

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Neil Sheridan 2019-1-3

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Firstly sizeof isn't a function (on my MATLAB setup) so I changed to size. Also, use == to check equality of numbers.

for i = 1 : size(up)

if boolean(i) == 0

telephone = [];

end

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Emma Sellers 2019-1-4

I've tried: 0, '0', and []

Emma Sellers 2019-1-4

Figured it out.. All i had to do was put uint64(0).

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Neil Sheridan 2019-1-4

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When a character is not found in characters() then coords(i) will be 0. numbers(0) will return an error because there is no zeroth element.

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RAMAKANT SHAKYA 2019-2-7

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在 MATLAB Online 中打开

function s2=dial(n)
p=[n];
s1='';
tx = ismember(p, ['A':'Z','0':'9']);%only digits and capital letters
tx1=sum(tx);
if length(p)<=16&& p(1,1)~='0'&& tx1==length(p) %finding letters
    for c=1:length(p)
        if p(c)=='A' || p(c)=='B' || p(c)=='C'
            s='2';
        elseif p(c)=='D' || p(c)=='E' || p(c)=='F'
            s='3';
        elseif p(c)=='G' || p(c)=='H' || p(c)=='I'
            s='4';
        elseif p(c)=='J' || p(c)=='K' || p(c)=='L'
            s='5';
        elseif p(c)=='M' || p(c)=='N' || p(c)=='O'
            s='6';
        elseif p(c)=='P' || p(c)=='Q' || p(c)=='R' || p(c)=='S'
            s='7';
        elseif p(c)=='T' || p(c)=='U' || p(c)=='V'
            s='8';
        elseif p(c)=='W' || p(c)=='X' || p(c)=='Y' || p(c)=='Z'
            s='9';
        else
            for r=0:9   %finding digit if present
                t=num2str(r);
                if p(c)==t
                    s=t;
                end
            end
        end
        s1=strcat(s1,s);    %adding string
        s2=str2num(s1);     %change into number
           
        s2=uint64(s2);  %changing class
        
    end
else
    s2=uint64(0);
end
end
            