Numerical Precision Physics Calculations
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I believe I may be encountering issues related to the numerical precision, but my understanding is limited so I wanted to ask the community. Hopefully I'm misunderstanding and someone can clarify!
I have a physics problem where I'm working with weak spatially varying magnetic fields, and calculating their response to conductive materials. For example, one calculation may involve a vector of doubles which range from 3e-7 to 4.9e-12 multiplied by one which has values of 0 or 5.89e7.
does this mean that all values below that eps value behave as zeros because there isn't sufficient precision for the calculation? Or do calculations work with say 4.9 *5.89 then e-12 *e7 seperately?
Fangjun Jiang 2022 年 8 月 25 日
編集済み: Fangjun Jiang 2022 年 8 月 25 日
It means that around 5.89e7 (which is a large value), the nearest values that can be represeted by double data type is 5.89e7+7.4506e-09 or 5.89e7-7.4506e-09. So you can see the minimal incremental value of 7.4506e-09 is quite small.
Since you are using the default double data type, there should be no problem representing your multiplication in the range of