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请问在math.h文件里面，有没有以e为底的自然对数函数呀，我只找到了下面这张图片的log函数，没找到以e为底的
math.h中应该是没有的，你可以看一下这两个帖子中的讨论：
https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/139326/square-roots-and-logarithms?tisearch=e2e-sitesearch&keymatch=%25252522Logarithmic%25252520function%25252522#
e2e.ti.com/.../tms320f28388d-natural-logarithm-function-from-fastrts-is-not-giving-the-correct-value
