Conditional Loop not executing properly

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Gwen Plato 2018-10-7

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https://ww2.mathworks.cn/matlabcentral/answers/422647-conditional-loop-not-executing-properly

关闭： MATLAB Answer Bot 2021-8-20

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So I am trying to build a loop that will calculate a problem for me. The problem being that for a range of certain x values I need a coefficient to equal something and at the other x values, the coefficient will equal something else. My loop won't run at all if I add an else statement(basically a catch-all to return an error) and when I take it off it won't calculate the values for the first condition.

t=[0:1:6];
r=zeros(1,length(t));
r(1)=0;
for i=1:(length(t))
  if t(i) < 2
      b(i)=1;
  elseif t(i) >= 2
      b(i)=150;
  x(i)=(b(i)*r(i))+20;
  r(i+1)=r(i)+x(i);
  fprintf('%.4f   %.2f\n',t(i),r(i))
  end
end