exponential

问题 I am taking a class in C++ and I noticed there are only a few math operators to use. I also noticed that C++ does not come with an exponential operator within its math library. Why must one always write a function for this? Is there a reason for the makers of C++ to omit this operator? 回答1: You don't write a function for this (unless you're insane, of course). There's a perfectly good pow function defined in the <cmath> header. Aside: if you try to use ^ as a power operator, as some people

问题 I'm looking for an efficient (Fast) approximation of the exponential function operating on AVX elements (Single Precision Floating Point). Namely - __m256 _mm256_exp_ps( __m256 x ) without SVML. Relative Accuracy should be something like ~1e-6, or ~20 mantissa bits (1 part in 2^20). I'd be happy if it is written in C Style with Intel intrinsics. Code should be portable (Windows, macOS, Linux, MSVC, ICC, GCC, etc...). This is similar to Fastest Implementation of Exponential Function Using SSE,

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: Convert exponential number to decimal in php Is there a way to convert an exponential number to a whole number in PHP using built in functions? A format function? 1.2378147769392E+14 to 123781477693917 回答1: number_format(1.2378147769392E+14,0,'','') However, for working with large numbers, if you want to keep precision, you should look into BCMath extension 来源： https://stackoverflow.com/questions/4964059/convert