bessel
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SheetJS
`BESSELI` gives wrong answer for some inputs
Examples
| Excel Formula | Excel Answer | SheetJS Answer |
|---|---|---|
| =BESSELI(-13.2,3) | -42092.84027 | -25425.470523920318 |
| =BESSELI(-13.8,9) | -5663.903109 | -3037.8756236089935 |
| =BESSELI(-10.08,2) | 2465.760003 | 2215.9970659564715 |
| =BESSELI(-11.06,0) | 7717.636762 | 6363.659791792667 |
| =BESSELI(-9.86,4) | 1061.120531 | 967.9812913086927 |
| =BESSELI(-12.81,7) | -5926.01108 | -3838.353089311662 |
| =BESSELI(-13.07,6) | 12963.19511 | 8019.79800362882 |
| =BESSELI(-14.37,7) | -32766.94859 | -15501.267818797078 |
| =BESSELI(-9.02,2) | 881.4361669 | 840.1405514233114 |
| =BESSELI(-13.3,16) | 8.029039773 | 4.759261926315784 |
| =BESSELI(-13.2,0) | 59922.88267 | 36195.423498210446 |
| =BESSELI(-10.21,5) | -974.2341176 | -867.2309455734216 |
| =BESSELI(-11.4,3) | -7078.122098 | -5619.615638800571 |
| =BESSELI(-10.09,4) | 1346.003156 | 1208.798299218855 |
| =BESSELI(-10.78,11) | -26.13731414 | -22.163938968958945 |
| =BESSELI(-9.41,11) | -3.543708301 | -3.3176964175025487 |
| =BESSELI(-11.59,0) | 12801.13745 | 9932.122603521633 |
When I ask scipy.special.iv, it agrees with Excel on the answer. When using that function, watch out for the arguments being switched—(n,x) rather than (x,n).
It should be noted I didn't find any bugs like this in BESSELJ, BESSELY, or BESSELK.
