" Array indices must be positive integers or logical values." appearing with piecewise function

Working on a function that takes a vector input and runs it through a piecewise and returns a vector of output values, getting this error when running it.

for i = 0:length(x)
  if x(i)<0
      y(i) = sind(x(i));
  elseif 0<=x(i) && x(i)<=1
      y(i)=x(i).^(1/2);
  elseif 1<x(i) && x(i)<x(6)
      y(i) = 1./factorial(floor(x(i)));
  elseif x(i)>=6 
      y(i) = 200*log(x(i));
  end
end

[Stephen23]

The problem is on this line:

for i = 0:length(x)

Like is standard in mathematics, indexing starts with one.

Answer 1

[madhan ravi]

x=rand(1,7) %this is vector input , an example 
for i = 1:length(x)
  if x(i)<0
      y(i) = sind(x(i));
  elseif 0<=x(i) && x(i)<=1
      y(i)=x(i).^(1/2);
  elseif 1<x(i) && x(i)<x(6)
      y(i) = 1./factorial(floor(x(i)));
  elseif x(i)>=6 
      y(i) = 200*log(x(i));
  end
end
y

[Caden Yarbrough]

Thanks! But when I test a vector, the factorial line is outputting only 0's?

[madhan ravi]

can you give an example of your vector?

[Caden Yarbrough]

The error was with my code later on, with the x(6) which was just a typo. Thanks!!

[madhan ravi]

You’re welcome