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I've noticed that import changes numbers slightly. For example, 0.417 becomes 0.416999999999. What is causing this to happen?

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Eric S on 14 Jan 2016

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I've noticed that import changes numbers slightly. For example, 0.417 becomes 0.416999999999. What is causing this to happen?

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John D'Errico on 14 Jan 2016

Edited: John D'Errico on 14 Jan 2016

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0.417 is a number that does not exist in a BINARY floating point form, so it is stored as

0.4169999999999999817923423961474327370524406433105468750

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Star Strider on 14 Jan 2016

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You’re seeing floating-point approximation error.

A recent discussion: Why do inconsistencies exist with floating-point numbers rounding in sprintf, fprintf, sin etc?

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