Hyperbolic function returns incorrect result

[Michael-Daugherty]

ℹ Computer information

• PowerToys version: v0.31.1
• PowerToy Utility: Run
• Running PowerToys as Admin: Yes
• Windows build number: 2004 (OS Build 21301.1010)
  📝 Provide detailed reproduction steps:
  Alt Space sinh(.9999999999999999999)
  ✔️ Expected result:
  1.175201193
  ❌ Actual result:
  0.0038758297

[crutkas]

I cut and paste and got the correct result. Even just hitting .9s Eventually you'll hit a precision issue with the mage plugin but that is a known issue.

[crutkas]

@Michael-Daugherty can you take a screenshot?

[Michael-Daugherty]

Sorry, It needs one more nine to produce the error as follows:
📝 Provide detailed reproduction steps:
Alt Space sinh(.99999999999999999999)
✔️ Expected result:
1.175201193
❌ Actual result:
0.0777408905

[Michael-Daugherty]

I know 20 digits of precision is stupid. But that's not the point. Something is wrong with the algorithm causing this discontinuous result. Possibly, truncate the input at 19 before doing the trig function. I'm a mechanical engineer, not a computer scientist or mathematician.

[crutkas]

it is a floating point precision issue. We don't control the calc library and just blindly send data to it. Once the precision gets above a precision, you get what is basically a casting error. Betting it casts to float vs double.

When we shift to the calculator's engine, this (famous last words) should be fixed.

[crutkas]

#2265 is the tracking item for calc engine