I couldnt run function, I got error

[Aziz YÜCELEN]

Hi

I am new for octave software. I wrote a function in a file (file name is try3.m ) and ran 

#  try3.m file

function find_point(x, modulo)
xeq1=(x^3)+x+1;
xeq2 = mod(xeq1,modulo);
  for i=0:(modulo-1)
      yeq1=(i^2);
     yeq2=mod(yeq1,modulo);
         if (xeq2==yeq2)
            printf("results:x= %d icin y=%d \n",x,i);
        endif
   endfor

endfunction

but I got this result:

>> try3

error: 'x' undefined near line 4 column 7
error: called from
    try3.m at line 4 column 5

what is wrong? And I want to call this function from cli but how?

Thanks.