*???index exceeds matrix dimensions*

i n my program i have used 'for' loop and 'if' loop at the end i am getting this comment ???index exceeds matrix dimensions after calculating 1 value, where i have to calculate 42 values

for x=1:42;
    if x==1
                m=Q0;
                h=h0;
                b1=0;

      end
      if x==2 
                   m=Q0;
                  h=(h0+h1)/2;
                  b1=0;

      end
      if x==3
                  m=Q0;
                  h=h1;
                  b1=0;

      end
      if x==4
                  m=Q30;
                  h=h1;
                  b1=30;

      end
      if x==5 
                   m=Q30;
                  h=(h1+h2)/2;
                  b1=30;

      end
      if x==6
                  m=Q30;
                  h=h2;
                  b1=30;

      end
      if x==7
                  m=Qn45;
                  h=h2;
                  b1=-45;

      end
      if x==8 
                   m=Qn45;
                  h=(h2+h3)/2;
                  b1=-45;

      end
      if x==9
                  m=Qn45;
                  h=h3;
                  b1=-45;

      end
  *an so on*
  %---------------- --------------------%
  Ex=ex0+(h)*Kx;
  Ey=ey0+(h)*Ky;
  Gxy=Gxy0+(h)*Kxy;
  Gxy1=Gxy/2;
  GSN=[Ex,Ey,Gxy]
  GSN1=[Ex;Ey;Gxy1];
  %------------------------------------%
  GSS=m*GSN
  b=b1*(3.14/180);
  C=cos(b);
  S=sin(b);
  %------------------------------------%
  T=[C^2,S^2,(2*S*C); S^2,C^2,(-2*S*C);(-S*C),(S*C),((C^2)-(S^2))]

[Jan]

Please post a copy of the complete error message and the line, which causes the error. Without seeing this line, even wild guessing would be too random.

[Andrei Bobrov]

NOW?

%---------

for x=1:42;

...

end

Ex=ex0+(h)*Kx;

...

T=[C^2,S^2,(2*S*C); S^2,C^2,(-2*S*C);(-S*C),(S*C),((C^2)-(S^2))]

%---------------------------------------

OR

%-------------------------------

for x=1:42;

...

Ex=ex0+(h)*Kx;

...

T=[C^2,S^2,(2*S*C); S^2,C^2,(-2*S*C);(-S*C),(S*C),((C^2)-(S^2))]

end

%----------------------------------

[Walter Roberson]

There is no such thing as an if loop.

Answer 1

[Walter Roberson]

Please show clearly the line that the message is received on, with the complete traceback.

The only code that you show that could potentially be indexing, are the calls to cos() and sin(), which MATLAB could understand as indexing if you had defined variables named "cos" or "sin".

I suspect the error is occurring on a line you have not shown us.