My 'for' loop is giving me "Array indices must be positive integers or logical values. " error.

A = [1,3,5,2,7,8];
>> count =0;
>> for i= 1:6
>> count = count + A(i);
Array indices must be positive integers or logical values.

[dpb]

   A = [1,3,5,2,7,8];
  count =0;
  for i= 1:6
  count = count + A(i); end
  >> count
  count =
      26
  >>

Above code didn't generate the error...

Answer 1

[Jan Kubski]

Have you tried to end your for loop with end command? I cannot see it in your code. Probably check this.

A = [1,3,5,2,7,8];
count =0;
for i= 1:6
count = count + A(i);
end

Answer 2

[Walter Roberson]

Notice you have

>> for i= 1:6
>> count = count + A(i);

if MATLAB was interpreting the "for i" as a for loop, you would not have received the >> prompt at that point: you would not have any prompt and instead the area below the window would change to "Continue entering statement"

So somehow your "for i" is not being interpreted as being a for statement. Given that, it is probably the case that i is (somehow) not being assigned a value, and so is still the default sqrt(-1) which is not a valid index.