How to include counter in the header?

Hi, I have a big amount of data stored in my file. It has to be formatted in a specific way. After each iteration I have to include G54D and number of iteration, like this G54D11, G54D12...But what I have now is this:

   G54D
x     0y-18834D03*
x-69978y-51185D03*
x-18678y 18834D03*
x 51300y 70020D03*
   G54D
x     0y  1949D03*
x-22629y-45893D03*

Could you please help to include counter in the header? Code I am using now is:

ct=11; while n<nmax for n=n:nmax; rn=(sqrt(2*n*f*lambda+n^2*lambda^2)); w=(lambda*f/2/rn); d=1.53096*w; phi=asin((d/2)/rn); num=floor(fillfactor/phi); gap=2*(pai/(num-1)-phi); a=rand; theta(1)=pai*a; for i=2:num; theta(i)=theta(i-1)+gap+2*phi; x(i)=1000000*rn*cos(theta(i)); y(i)=1000000*rn*sin(theta(i)); end; ct=ct+1 fileID = fopen('matrix.txt','a+' ); formatSpec = 'x%6.0fy%6.0fD03*\n' fprintf(fileID,'%7s\n','G54D'); fprintf(fileID,'x%6.0fy%6.0fD03*\n',x,y); fclose(fileID); end end;

Thanks!

[Olha]

Sorry, code is:

ct=11;

while n<nmax

    for n=n:nmax;
    rn=(sqrt(2*n*f*lambda+n^2*lambda^2)); 
    w=(lambda*f/2/rn);                      
    d=1.53096*w;                                   
    phi=asin((d/2)/rn);                               
    num=floor(fillfactor/phi);                       
    gap=2*(pai/(num-1)-phi);                           
     a=rand;
     theta(1)=pai*a;
     x(1)=1000000*rn*cos(theta(1))
     y(1)=1000000*rn*sin(theta(1))
     for i=2:num;
                theta(i)=theta(i-1)+gap+2*phi;  
                 x(i)=1000000*rn*cos(theta(i));
        y(i)=1000000*rn*sin(theta(i));
    end;
    ct=ct+1   
    fileID = fopen('matrix.txt','a+' );
formatSpec = 'x%6.0fy%6.0fD03*\n'
fprintf(fileID,'%7s\n','G54D');
fprintf(fileID,'x%6.0fy%6.0fD03*\n',x,y);
fclose(fileID);
    end
    end;

Answer 1

[per isakson]

    fprintf( fileID, '%7s%2d\n','G54D', ct );

.

[EDIT] Small test

    ct = 11;
    fprintf( 1, '%7s%2d\n','G54D', ct );

outputs

   G54D11

to the command window

[Olha]

Thank you for your answer, but it doesn't work, what I have using your code is this:

   G54D
      
x     0y-18834D03*
x-51300y-70020D03*
   G54D
|
x -1949y 22629D03*
x 26415y     0D03*

It just adds 1 row and puts strange characters in there, like |, \

And I have to start numbering from 11, that's why I included separate counter ct, instead of n. Thanks.

[per isakson]

See above

[Olha]

Yes, I see, it should work. This is strange...I still have the same output. I do not understand why it is adding extra row with strange symbols instead of just adding 11 to the first part? Any ideas why it is happening? Did I place ct in the right place in the code? Can it matter? Thanks!

[per isakson]

"strange symbols" might be caused by a problems with the class of the value of the variable, ct. Set a breakpoint and try

    class( ct )

or add the line

    class( ct )

before the print statement.

[Olha]

:( Same result, class(ct) is double

[per isakson]

To help, we need to know exactly what code together with input that gives the unexpected result.