Applications of r
r is the correlation coefficient in statistics mode. The way to compute it is different for each statistics submode, the calculator implements this with a lookup table to find out the function to call. If the submode is unexpected, the array is accessed out-of-bound and the code jumps to an unintended section.
Currently there are 2 methods to type r in an unintended mode, without invoking basic overflow.
ES PLUS series
fx-570ES PLUS / fx-991ES PLUS
Enter mode 68
Source: http://tieba.baidu.com/p/1735724120
- Use this method to get r in COMP mode.
- Modify the formula to get
\begin{align} \sqrt{\int_1^1{X^2 \text{dx}} \sqrt3 r} \end{align}
- Press [=].
Misc 1
- Use this method to get r in COMP mode.
- Modify the formula to get ((((((1(1)r.
- Press [M+].