Data Entry with struct

I'm stuck with the following data entry assignment. Your suggestions will be highly appreciated.

In a voting center, the voters are required to give their names and ID numbers to the voting staff before going int incoming voters' information. Write a function called voters to record the incoming voters' information. The function should take an unspecified number of inputs, but the first input will be the current database. The rest of the arguments must come order of name, a string or char array, and ID, an integer or integer-valued double. If there is at least one ocurrence of no ID number after a name, or the data types are not what's required, return the original database. The function should return a struct array containing Name (a string) and ID( a double) fields as shown below

>> database = voters([], 'Brandon', 12356)

database =

struct with fields:

Name: "Brandon"

ID: 12356

>> database = voters(database, "Mike", 9876, 'Akos', 112233)

database =

1x3 struct array with fields:

Name

ID

>> database(end)

ans =

struct with fields:

Name: "Akos"

ID: 112233

However, if there is an illegal call, the database should not change:

>> database

database =

1x3 struct array with fields:

Name

ID

>> database = voters(database, 'Student', 99999, "No ID")

database =

1x3 struct array with fields:

Name

ID

Here's the code I tried -

function database = voters(varargin)
    database = struct('Name', {}, 'ID', {});
    if nargin >= 5 & mod(nargin, 2) ~= 0
        for i = 2:2:nargin-1
            if ischar(varargin{i}) & isa(varargin{i+1}, 'double') & isempty(varargin{1})
                database = struct('Name', varargin{i}, 'ID', varargin{i+1})];
            else
                database = database;
                break;
            end
        end
    else if nargin == 3 & ischar(varargin{2}) & isa(varargin{3}, 'double') & isempty(varargin{1})
        database = struct('Name', varargin{2}, 'ID', varargin{3});
    else
        database = database;
    end
end

[likith yerram]

Error in solution: Line: 6 Column: 34

Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

Answer 1

[Alberto Zekry]

function database = voters(di,varargin)
    if isempty(di)
        database = struct('Name', {}, 'ID', {});
    end
    if rem(nargin,2)==0
        database=di
        return
    end
    si=length(varargin)/2;
    for ii = 1:si
        jj=2*ii;
        if (ischar(varargin{jj-1}) || isstring(varargin{jj-1})) && isa(varargin{jj}, 'double') && (fix(varargin{jj})==(varargin{jj}))
            database(ii) = struct('Name', convertCharsToStrings(varargin{(2*ii)-1}), 'ID', double(varargin{2*ii}));
        else
            database=di
            return
        end
    end
    database=[di database]
end

Answer 2

[Ahsan Ali]

Check this Out (Tested)

function database = voters(di,varargin)
    if isempty(di)
        database = struct('Name', {}, 'ID', {});
    end
    if rem(nargin,2)==0
        database=di;
        return
    end
    si=length(varargin)/2;
    for ii = 1:si
        jj=2*ii;
        if (ischar(varargin{jj-1}) || isstring(varargin{jj-1})) && isa(varargin{jj}, 'double') && (fix(varargin{jj})==(varargin{jj}))
            database(ii) = struct('Name', string(varargin{(2*ii)-1}), 'ID', double(varargin{2*ii}));
        else
            database=di;
            return
        end
    end
    database=[di database];
end

Answer 3

[Abdul Quadir Khan]

function database = voters(di,varargin)
    if isempty(di)
        database = struct('Name', {}, 'ID', {});
    end
    if rem(nargin,2)==0
        database=di
        return
    end
    si=length(varargin)/2;
    for ii = 1:si
        jj=2*ii;
        if (ischar(varargin{jj-1}) || isstring(varargin{jj-1})) && isa(varargin{jj}, 'double') && (fix(varargin{jj})==(varargin{jj}))
            database(ii) = struct('Name', convertCharsToStrings(varargin{(2*ii)-1}), 'ID', double(varargin{2*ii}));
        else
            database=di
            return
        end
    end
    database=[di database]
end

[PADMAKAR]

I am tryint to use setfield to add fields to a structure. It does not seem to work. The problem is the same as above. Here is my code

function [dbase_out]=voters(dbase_in,varargin)
if isempty(dbase_in)
  dbase_out = struct('Name', {}, 'ID', {});
  return
end

i

f isempty(varargin)
    dbase_out=struct('Name',{},'ID',{});
    dbase_out=dbase_in;
    return
elseif ~rem(length(varargin),2)==0
    dbase_out=struct('Name',{},'ID',{});
    dbase_out=dbase_in;
    return
end

%----------------------------------------------------------------------------------------------------------------------------------------------

for i = 1:2:length(varargin)/2
    if ischar(varargin{i}) || isstring(varargin{i})
    else
    dbase_out = dbase_in;
    return;
    end 
end

% create a empty structure because the number of fields required also includes empty fields from database

dbase_out = struct('Name', {}, 'ID', {});

for ii=1:length(varargin)/2
    n=2*ii ;
        if isa(varargin{n}, 'double') && (fix(varargin{n})==(varargin{n}))
         dname{ii}= string(varargin{n-1});
          dID{ii}= double(varargin{n});
        end
end

%dbase_out=struct('Name',dname,'ID',dID);

for i=2: length(varargin)/2
    dbase_out=setfield(dbase_out,'Name',dname(i));
    dbase_out=setfield(dbase_out,'ID',dID(i));
end

Answer 4

[Black Woods]

function database=voters(varargin)
    if isempty(varargin{1})
        jj=ones(1,1);
    else
        jj=length(varargin{1})+1;database=varargin{1};
    end
if isequal(mod(length(varargin)-1,2),0)
    for ii=2:2:length(varargin)
        if (isa(varargin{ii},'char')||isa(varargin{ii},'string'))&&((isa(varargin{ii+1},'double')||isa(varargin{ii+1},'int32'))&&isequal(fix(varargin{ii+1}),varargin{ii+1}))
            database(jj).Name=string(varargin{ii});database(jj).ID=varargin{ii+1};jj=jj+1;            
        else
            database=varargin{1};
            return
        end
    end
else
    database=varargin{1};
    return
end