What is '-1.#IND'?
c++, floating-point
Solution
`#IND` means an indetermined form.
What you have there is something known as `'Not a number'` or NaN for short.
Quoting from Wikipedia, generation is done by:
- Operations with a NaN as at least one operand.
- The divisions 0/0 and ±∞/±∞
- The multiplications 0×±∞ and ±∞×0
- The additions ∞ + (−∞), (−∞) + ∞ and equivalent subtractions
- The square root of a negative number.
- The logarithm of a negative number
- The inverse sine or cosine of a number that is less than −1 or greater than +1.
You're doing at least one of those things.
Edit:
After analyzing your code, these are 2 possibilities:
- When `n == 0` in the first iteration where `j == 0` too, `Xnew2` will be `-1.#IND`
- When `Xnew2` is greater than `X`, `Ynew2` will be complex -> `NaN`
Problem
I have some code that will allow me to draw a crescent moon shape, and have extracted the values to excel to be drawn. However in place of some numbers, there is `-1.#IND` in place. Firstly if anyone could explain what this means, as Google came back with 0 links. And secondly if there is anyway to stop it from occurring. There is a brief analogy of my code. I have lots more code besides this, however that is just calculating angles. ``` for(int j=0; j<=n; j++)//calculation for angles and output displayed to user { Xnew2 = -j*(Y+R1)/n; //calculate x coordinate Ynew2 = Y*(pow(1-(pow((Xnew2/X),2)),0.5)); if(abs(Ynew2) <= R1) cout<<"\n("<<Xnew2<<", "<<Ynew2<<")"<<endl; } ``` MORE INFO I'm now having the problem with this code. ``` for(int i=0; i<=n; i++) //calculation for angles and output displayed to user { Xnew = -i*(Y+R1)/n; //calculate x coordinate Ynew = pow((((Y+R1)*(Y+R1)) - (Xnew*Xnew)), 0.5); //calculate y coordinate ``` AND ``` for(int j=0; j<=n; j++)//calculation for angles and output displayed to user { Xnew2 = -j*(Y+R1)/((n)+((0.00001)*(n==0))); //calculate x coordinate Ynew2 = Y*(pow(abs(1-(pow((Xnew2/X),2))),0.5)); if(abs(Ynew2) <= R1) cout<<"\n("<<Xnew2<<", "<<Ynew2<<")"<<endl; ``` I am having the problem drawing the crescent moon that I cannot get the two circles to have the same starting point? If this makes sense, I am trying to get two parts of circles to draw a crescent moon as such that they have the same start and end points. The only user input I have to work by is the radius and chosen center point. If anyone has any suggestions on how to do this, it would be great, currently all I am getting more a 'half doughnut' shape, due to the circles not being connected.