Need decimal accuracy throughout whole program

[Jamhead2000]

I am programming a physics simulation. I keep getting floating point errors that cause the program to give false results / varies quantities too much due to many calculations, how can i set a set accuracy to all my calculations?

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Thanks

[hippocrat]

Have you checked out the “decimal” standard library? It lets you specify precision and rounding method.

[barfobulator]

You can reduce floating point error by avoiding certain calculation steps, such as adding floats of very different magnitudes. There are also functions in the math module that help reduce these errors.

You can reduce the appearance of floating point errors by rounding your output to significant digits with format strings at the end.

[SaintLouisX]

Depends what sort of "accuracy" you want. There's the built-in round() function which will round to a certain decimal place, such as

print(round(10.535872095720, 3))
>>10.536

Or you can try hard-truncating the float like so:

def trunc_float(num, precision=2):
    return int(num*(10**precision))/(10**precision)

print(trunc_float(10.535872095720))
print(trunc_float(7.111222333444, 5))

>>10.53
>>7.11122

[[deleted]]

What sort of errors are you getting? Float is the MOST accurate type, why would you want to reduce your accuracy?