Why my code is not working, showing the error "Illegal use of reserved keyword "elseif"

Parse error: Illegal use of reserved keyword "elseif".

Function 'MATLAB Function' (#23.614.615), line 44, column 5: "e" Launch diagnostic report.

function [SaT, SaB, SbT, SbB, ScT, ScB] = pwm(u) f = 50; ts=0.0002; vdc=1; peak_phase_max = vdc/sqrt(3);

x=u(2);

y=u(3); mag=(u(1)/peak_phase_max) * ts;

% sector I if (x>=0) && (x<pi/3)

ta = mag * sin(pi/3-x); tb = mag * sin(x); t0 =(ts-ta-tb); t1=[t0/4 ta/2 tb/2 t0/2 tb/2 ta/2 t0/4]; t1=cumsum(t1);

v1=[0 1 1 1 1 1 0]; v2=[0 0 1 1 1 0 0]; v3=[0 0 0 1 0 0 0]; for j=1:7 if(y<t1(j)) break end end SaT = v1(j); SaB = 1-v1(j); SbT = v2(j); SbB = 1-v2(j); ScT = v3(j); ScB = 1-v3(j);

end

% sector II elseif (x>=pi/3) && (x<2*pi/3)

adv= x-pi/3; tb = mag * sin(pi/3-adv); ta = mag * sin(adv); t0 =(ts-ta-tb);

t1=[t0/4 ta/2 tb/2 t0/2 tb/2 ta/2 t0/4]; t1=cumsum(t1);

v1=[0 0 1 1 1 0 0]; v2=[0 1 1 1 1 1 0]; v3=[0 0 0 1 0 0 0];

for j=1:7 if(y<t1(j)) break end end

SaT = v1(j); SaB = 1-v1(j); SbT = v2(j); SbB = 1-v2(j); ScT = v3(j); ScB = 1-v3(j);

end %sector III

    elseif (x>=2*pi/3) && (x<pi)
        		adv=x-2*pi/3;
                ta = mag * sin(pi/3-adv);
		        tb = mag * sin(adv);
		        t0 =(ts-ta-tb);

t1=[t0/4 ta/2 tb/2 t0/2 tb/2 ta/2 t0/4]; t1=cumsum(t1); v1=[0 0 0 1 0 0 0]; v2=[0 1 1 1 1 1 0]; v3=[0 0 1 1 1 0 0]; for j=1:7 if(y<t1(j)) break end end SaT = v1(j); SaB = 1-v1(j); SbT = v2(j); SbB = 1-v2(j); ScT = v3(j); ScB = 1-v3(j); end

%sector IV

    elseif (x>=-pi) && (x<-2*pi/3)

                adv = x  + pi; 

tb= mag * sin(pi/3 - adv); ta = mag * sin(adv); t0 =(ts-ta-tb);

t1=[t0/4 ta/2 tb/2 t0/2 tb/2 ta/2 t0/4]; t1=cumsum(t1); v1=[0 0 0 1 0 0 0]; v2=[0 0 1 1 1 0 0]; v3=[0 1 1 1 1 1 0];

for j=1:7 if(y<t1(j)) break end end

SaT = v1(j); SaB = 1-v1(j); SbT = v2(j); SbB = 1-v2(j); ScT = v3(j); ScB = 1-v3(j);

end % sector V

    elseif (x>=-2*pi/3) && (x<-pi/3)

adv = x+2*pi/3;

ta = mag * sin(pi/3-adv); tb = mag * sin(adv); t0 =(ts-ta-tb);

t1=[t0/4 ta/2 tb/2 t0/2 tb/2 ta/2 t0/4]; t1=cumsum(t1); v1=[0 0 1 1 1 0 0]; v2=[0 0 0 1 0 0 0]; v3=[0 1 1 1 1 1 0];

for j=1:7 if(y<t1(j)) break end end

SaT = v1(j); SaB = 1-v1(j); SbT = v2(j); SbB = 1-v2(j); ScT = v3(j); ScB = 1-v3(j);

end

%Sector VI (x>=-pi/3) && (x<0)

    else 

adv = x+pi/3; tb = mag * sin(pi/3-adv); ta = mag * sin(adv); t0 =(ts-ta-tb);

t1=[t0/4 ta/2 tb/2 t0/2 tb/2 ta/2 t0/4]; t1=cumsum(t1); v1=[0 1 1 1 1 1 0]; v2=[0 0 0 1 0 0 0]; v3=[0 0 1 1 1 0 0]; for j=1:7 if(y<t1(j)) break end end SaT = v1(j); SaB = 1-v1(j); SbT = v2(j); SbB = 1-v2(j); ScT = v3(j); ScB = 1-v3(j); end

Answer 1

[Kai Domhardt]

Your control flow is broken, it appears that there is always one "end" when you see three "end"

Also there is no If statement corresponding to all those Elseif statements.

I have deleted all conditionals and actual code, as to leave only the control flow structure, that should make it easier to see what is wrong.

          function
          % sector I
          for
              if
              end
          end
      end
      % sector II
      for
          if
          end
      end
  end
  %sector III
  elseif
      for
          if
          end
      end
  end
  %sector IV
  elseif
      for
          if
          end
      end
  end
  % sector V
  elseif
      for
          if
          end
      end
  end
  %Sector VI
  else
      for
          if
          end
      end
  end

Answer 2

[keerthi vardhana]

STILL I HAD RECEIVED ERROR ?

[Steven Lord]

If you have the code open in the MATLAB Editor, select all of it, right-click, and select "Smart Indent" from the context menu. This will line up for, if, elseif, and else statements with their corresponding end statements.

The final end should line up with the initial for or if. If it doesn't, you're probably missing one or more end statements. If it does but there are other end statements all at the same level of indentation (with the later ones possibly underlined in red) then you probably have too many end statements.

Basically, look for red Code Analyzer indicators as they will likely indicate where the problem is located (or where MATLAB was able to determine that there is a problem.)