CODEWITHSUNDEEP
matlabif-statement
FofX
FofX

Reputation: 135

Matlab: Inequality in If statement results in error

I apologize in advance, I'm sure the answer to this question is quite trivial, unfortunately I am just not sure what is going on.

I am trying to run the following code

a(1) = -2;
b(1) = 2;
c(1) = 0;


for i = 1:15

  if cubicPoly(a(i))*cubicPoly(c(i)) < 0
    a(i+1) = a(i);
    b(i+1) = c(i);

  else
    a(i+1) = c(i);
    b(i+1) = b(i);

  end

end

but when I do I receive the error message

Index exceeds matrix dimensions.

Error in Assignment2 (line 31)
if cubicPoly(a(i))*cubicPoly(c(i)) < 0

If I evaluate my cubic polynomial function cubicPoly normally, everything works just fine. But inside the for/if loop when evaluated at the sequences a(i) and c(i) it results in an error.

Any help would be appreciated.

Upvotes: 1

Views: 79

Answers (1)

frslm
frslm

Reputation: 2978

It doesn't look like you ever add more elements to c; when i = 2, you're trying to access c(2) in if cubicPoly(a(i))*cubicPoly(c(i)) < 0, which takes you out of bounds.

You might want to include something like c(i+1) = ... if you intend to add elements to c while looping.

Upvotes: 3

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