MicroPython
accuracy of math.pi #16479
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I have a very simple script which show pi for 15 digits. I wounder about the result: 3.14159274101257. Could anyone pls. help to clarify the different results? import math
d = math.pi
print(f'{d:.15}')Platform: MicroPython v1.24.1 on 2024-11-29; ESP32C3 module with ESP32C3 |
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Replies: 4 comments 2 replies
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Esp32c3 uses single float. So, only 6-7 digits are significant. |
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3.14 is accurate enough for the most calculations. |
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Thank you @robert-hh for you explanation! @sosi-deadeye: I agree that this might be sufitient for most cases, but I'm running GPS calculations with the Haversine formula on short distance between two GPS points. This requires a more presice calculation. |
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Few MicroPython firmwares have FP64 (double precision for floats), like Pyboard : Other solution : |
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To clarify re Pyboards: The Pyboard V1.1 has 32-bit hardware FP, but it can have firmware compiled with FP64. This is available as a precompiled build. The Pyboard D SF6W has 64-bit hardware FP. |
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There are also unofficial FP64 builds for the RP2040, but they are tremendously slow. DecimalNumber is wonderful, but even slower than all that. |
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Esp32c3 uses single float. So, only 6-7 digits are significant.