How do I make this into a function?

Hey, Ive been practicing making functions and it was going well until I came across this one. Im not sure if I can make it all into one function, but if possible that would be very nice! If I cant make it into one function, let me know how I can condense this a bit more. Currently it is in my main code and I would like to make my main code look nice and tidy =). Heres the code. Mostly Im shaky on what the input and output arguments should be.

 figure(1);
 kpressed = 0;
 HF=figure(1);
 set(HF,'KeyPressFcn','global kpressed; global HF; kpressed = get(HF,''CurrentChar'');');
 exitflag = 0; while (exitflag == 0)
    tic
    if kpressed ~= 0
        switch kpressed
            case ' '
                exitflag = 1;
        end
    end
    tic
    fprintf(s1,'TX:0001031A')
    datastr=fscanf(s1);  

 %example output: 0101+03088+00430-09342-01733+003378+003172-078475+019460000003100000697    

    data.NumberOfhandles=hex2dec(datastr(1:2));
    data.HandleID=hex2dec(datastr(3:4));   
    if isequal(datastr([5:11,31:37]), 'MISSINGMISSING' )
        data.Q0=0;
        data.Qx=0;
        data.Qy=0;
        data.Qz=0;
        data.Tx=0;
        data.Ty=0;
        data.Tz=0;
        data.rmsError=0;
        data.PortStatus=hex2dec(datastr(12:19));
        data.FrameNumber=hex2dec(datastr(20:27));
        data.RotMatrix=zeros(3,3);
        data.HomogeneousMatrix=zeros(4,4);
        data.Euler=zeros(3,1);
        data.Yaw=0;
        data.Pitch=0;
        data.Roll=0;       
        data.Q02=0;
        data.Qx2=0;
        data.Qy2=0;
        data.Qz2=0;
        data.Tx2=0;
        data.Ty2=0;
        data.Tz2=0;
        data.rmsError2=0;
        data.PortStatus2=hex2dec(datastr(12:19));
        data.FrameNumber2=hex2dec(datastr(20:27));
        data.RotMatrix2=zeros(3,3);
        data.HomogeneousMatrix2=zeros(4,4);
        data.Euler2=zeros(3,1);
        data.Yaw2=0;
        data.Pitch2=0;
        data.Roll2=0    

       elseif datastr(5:11)=='MISSING'
        data.Q0=0;
        data.Qx=0;
        data.Qy=0;
        data.Qz=0;
        data.Tx=0;
        data.Ty=0;
        data.Tz=0;
        data.rmsError=0;
        data.PortStatus=hex2dec(datastr(12:19));
        data.FrameNumber=hex2dec(datastr(20:27));
        data.RotMatrix=zeros(3,3);
        data.HomogeneousMatrix=zeros(4,4);
        data.Euler=zeros(3,1);
        data.Yaw=0;
        data.Pitch=0;
        data.Roll=0;

        data.Q02=str2double(datastr(31:36))/10000;
        data.Qx2=str2double(datastr(37:42))/10000;
        data.Qy2=str2double(datastr(43:48))/10000;
        data.Qz2=str2double(datastr(49:54))/10000;
        data.Tx2=str2double(datastr(55:61))/100;
        data.Ty2=str2double(datastr(62:68))/100;
        data.Tz2=str2double(datastr(69:75))/100;
        data.rmsError2=str2double(datastr(76:81));
        data.PortStatus2=hex2dec(datastr(82:89));
        data.FrameNumber2=hex2dec(datastr(90:97));
        data.RotMatrix2=Quat2RotMat(data.Q02,data.Qx2,data.Qy2,data.Qz2);
        data.HomogeneousMatrix2=HomoMatrix(data.Q02,data.Qx2,data.Qy2,data.Qz2,data.Tx2,data.Ty2,data.Tz2);
        data.Euler2=RotMat2Euler(data.RotMatrix2);
        data.Yaw2=data.Euler2(1);
        data.Pitch2=data.Euler2(2);
        data.Roll2=data.Euler2(3);    

       elseif datastr(75:81)=='MISSING'
        data.Q0=str2double(datastr(5:10))/10000;
        data.Qx=str2double(datastr(11:16))/10000;
        data.Qy=str2double(datastr(17:22))/10000;
        data.Qz=str2double(datastr(23:28))/10000;
        data.Tx=str2double(datastr(29:35))/100;
        data.Ty=str2double(datastr(36:42))/100;
        data.Tz=str2double(datastr(43:49))/100;
        data.rmsError=str2double(datastr(50:55));
        data.PortStatus=hex2dec(datastr(56:63));
        data.FrameNumber=hex2dec(datastr(64:71));
        data.RotMatrix=Quat2RotMat(data.Q0,data.Qx,data.Qy,data.Qz);
        data.HomogeneousMatrix=HomoMatrix(data.Q0,data.Qx,data.Qy,data.Qz,data.Tx,data.Ty,data.Tz);
        data.Euler=RotMat2Euler(data.RotMatrix);
        data.Yaw=data.Euler(1);
        data.Pitch=data.Euler(2);
        data.Roll=data.Euler(3);
        data.Q02=0;
        data.Qx2=0;
        data.Qy2=0;
        data.Qz2=0;
        data.Tx2=0;
        data.Ty2=0;
        data.Tz2=0;
        data.rmsError2=0;
        data.PortStatus2=hex2dec(datastr(82:89));
        data.FrameNumber2=hex2dec(datastr(90:97));
        data.RotMatrix2=zeros(3,3);
        data.HomogeneousMatrix2=zeros(4,4);
        data.Euler2=zeros(3,1);
        data.Yaw2=0;
        data.Pitch2=0;
        data.Roll2=0;

     else
        data.Q0=str2double(datastr(5:10))/10000;
        data.Qx=str2double(datastr(11:16))/10000;
        data.Qy=str2double(datastr(17:22))/10000;
        data.Qz=str2double(datastr(23:28))/10000;
        data.Tx=str2double(datastr(29:35))/100;
        data.Ty=str2double(datastr(36:42))/100;
        data.Tz=str2double(datastr(43:49))/100;
        data.rmsError=str2double(datastr(50:55));
        data.PortStatus=hex2dec(datastr(56:63));
        data.FrameNumber=hex2dec(datastr(64:71));
        data.RotMatrix=Quat2RotMat(data.Q0,data.Qx,data.Qy,data.Qz);
        data.HomogeneousMatrix=HomoMatrix(data.Q0,data.Qx,data.Qy,data.Qz,data.Tx,data.Ty,data.Tz);
        data.Euler=RotMat2Euler(data.RotMatrix);
        data.Yaw=data.Euler(1);
        data.Pitch=data.Euler(2);
        data.Roll=data.Euler(3);        
        data.Q02=str2double(datastr(75:80))/10000;
        data.Qx2=str2double(datastr(81:86))/10000;
        data.Qy2=str2double(datastr(87:92))/10000;
        data.Qz2=str2double(datastr(93:98))/10000;
        data.Tx2=str2double(datastr(99:105))/100;
        data.Ty2=str2double(datastr(106:112))/100;
        data.Tz2=str2double(datastr(113:119))/100;
        data.rmsError2=str2double(datastr(120:125));
        data.PortStatus2=hex2dec(datastr(126:133));
        data.FrameNumber2=hex2dec(datastr(134:141));        
        data.RotMatrix2=Quat2RotMat(data.Q02,data.Qx2,data.Qy2,data.Qz2);
        data.HomogeneousMatrix2=HomoMatrix(data.Q02,data.Qx2,data.Qy2,data.Qz2,data.Tx2,data.Ty2,data.Tz2);
        data.Euler2=RotMat2Euler(data.RotMatrix2);
        data.Yaw2=data.Euler2(1);
        data.Pitch2=data.Euler2(2);
        data.Roll2=data.Euler2(3);
    end

    figure(1)
    plot3(data.Tx2,data.Ty2,data.Tz2,'b*',data.Tx,data.Ty,data.Tz,'r*')
    xlim([-200 200]);
    ylim([-200 200]);
    zlim([-1000 -500]);
    drawnow
    toc
end

Answer 1

[dpb]

Doesn't look like it needs any inputs.

If you want outputs returned of the data structure, say, instead of just having everything in the workspace then convert it to a function by simply adding the function statement at the beginning.

function data = your_new_funct_name

Remember the naming/calling in Matlab to name the function m-file the same as the function name.