Operands to the || and && operators must be convertible to logical scalar values. What is the error?

Question

Sandip More 2014-4-18

0
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关闭： MATLAB Answer Bot 2021-8-20

Hi All, I am writing a following code and I am getting an error. Here is code

s=12/100;
h=1.2/100;
l2=3/100;l3=10/100;l4=6/100;
theta2=ones(1,361,'double');
theta3=ones(1,361,'double');
theta4=ones(1,361,'double');
for i=1:length(theta2)
  theta2(i)=(i-1)*pi/180;
  theta3(i)=120*pi/180;
  theta4(i)=45*pi/180;
end
J1=ones(2,2,'double');
f1=ones(2,1,'double');
norm=1;num=1;
dtheta=zeros(1,2);
for i=1:361
  it=1;norm=1;
  while norm>0.01 && it<100
      J1=[-l3*sin(theta3(i)),l4*sin(theta4(i));l3*cos(theta3(i)),-l4*cos(theta4(i))];
      f1=-[s-l4*cos(theta4)+l3*cos(theta3)+l2*cos(theta2);h-l4*sin(theta4)+l3*sin(theta3)+l2*sin(theta2)];
      dtheta=inv(J1)*f1;
      theta3=dtheta(1,:)+theta3(i);
      theta4=dtheta(2,:)+theta4(i);
      norm=sqrt(dtheta(1,:).^2+dtheta(2,:).^2);
      it=it+1;
  end
end

Please help.

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Answer 1

Azzi Abdelmalek 2014-4-18

1
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Use

while norm>0.01 & it<100

norm is a vector, what norm>0.01 means?

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Sandip More 2014-4-18

Norm is a magnitude of a vector and it is a measure of error in my problem. If I use & which is for a scalar, I don't get the expected results and some wired results appeared on screen.