can someone help me? when I want to insert the plaintext and also the matrix to the hill cipher, syntax out: Error using hillspasi (line 2) Not enough input arguments. is there something wrong in my code?

function hillspasi(x,k)
[r,c]=size(k);
if r~=c                                         %jika jumlah baris tidak sama dengan jumlah kolom
    disp('Kunci harus matrik bujur sangkar')    
else
    data=upper(x);
    if ismember(' ',data)==1                    %cek inputan mengandung spasi
        spasi=find(data==' ');
        km=size(spasi,2);
    else
        spasi=0;
    end;
    n=size(data,2);
    xx=[];
    a=0;
    for i=1:n                                   %menghilangkan spasi pada input jika ada
        if data(i)~=' '
            a=a+1;
            xx=[xx data(i)];
        end;
    end;
    s=mod(a,r);
    if s~=0
       ss=r-s;
       sss=[];
       for i=1:ss
           sss=[sss 'X' ];
       end;
       xx=[xx sss];
       a=a+ss;
    else
        ss=0;
    end;
    i=1;
    h=[];
    while i<=a
        m=[];
        for j=i:(i-1+r)
            m=[m xx(j)];
        end;
        m=double(m)-65;
        c=mod(k*m',26);
        c=(c+65)';
        h=[h char(c)];
        i=i+r;
    end;
    if spasi~=0
        hx=[];j=1;kk=0;
        sj=spasi(j);
        for i=1:n+ss
            if i==sj
                hx=[hx ' '];
                j=j+1;
                if j<=km
                    sj=spasi(j);
                end;
            else
                kk=kk+1;
                if kk<=a
                    d=h(kk);
                    hx=[hx d];
                end;
            end;
        end;
    else
        hx=h;
    end;
    hh=[];
    for i=1:n
        hh=[hh hx(i)];
    end;
    disp('CIPHER : ')
    disp('~~~~~~~~')
    disp(hx)
    if ~isequal(hx,hh)
        disp(' ')
        disp('CIPHER DENGAN MENGHILANGKAN KARAKTER TAMBAHAN :')
        disp('~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~')
        disp(hh)
    end;
end;

Answer 1

[Shaunak]

Hello Faiz,

The error message "Not enough input arguments" typically indicates that the function is being invoked incorrectly, rather than an issue with the function's definition itself.

To resolve this, ensure that the number of arguments you pass when calling the function matches the number of parameters specified in the function's definition.

Below is an example for your reference:

% Example plaintext 
plaintext = 'HELLO WORLD'; 
 
% Example key matrix (ensure it's a square matrix) 
keyMatrix = [3 3; 2 5]; 
 
% Call the function with both arguments 
hillspasi(plaintext, keyMatrix); 

By ensuring that both the plaintext and the key matrix are provided as arguments, you can avoid this common error and ensure the function operates as intended.

Please refer to this documentation for more information on function calling:

https://www.mathworks.com/help/matlab/learn_matlab/calling-functions.html