Sometimes I see people leave off the base by mistake when posting questions and it seems from the comments they get that it doesn't simply mean "log of xx to some base but I haven't said which yet". For example, does it indicate the complex logarithm? notation logarithms Share Cite...
all positive values, skewed distributions with low mean values and large variance. since, only for positive values, log(x) exists. probability density function a random variable x is distributed log-normally if and only if the logarithm of x is normally distributed. also, the value of x ...
doubleMathRandomLognormal( const doublemu,// 期望值对数(平均对数) const doublesigma,// 均方根偏差对数(对数标准偏差) const intdata_count,//所需的数据量 double&result[]// 伪随机变量值数组 ); 参数 mu [in] 期望值对数(log_mean)。
Log calculations occur in fractals, entropy and chaos theory, as well as the analysis of computation complexity of different computer algorithms[2]. They are valuable for describing algorithms in which a larger problem is divided into a set of smaller ones, and then the solutions of the smaller...
如果要计算任意精度，可以用AGM(Arithmetic–Geometric Mean)迭代法，其原理是选定a_0,b_0后，进行迭代a_{n+1}=\frac{a_n+b_n}{2};b_{n+1}=\sqrt{a_nb_n}，可证序列\{a_n\},\{b_n\}有公共极限，记作\textrm{AGM}(a_0,b_0)。现在由如下的重要定理，对x\in(1/2,1)且n\geqslant3有...
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doubleMathMomentsLognormal( const doublemu,// logarithm of the expected value (log mean) const doublesigma,// logarithm of the root-mean-square deviation (log standard deviation) double&mean,// variable for the mean double&variance,// variable for the variance ...
The monotonicity of the two variable Hölder mean is a consequence of a certain inequality for log cosh x . This in turn is shown to be a limiting case of an inequality not involving any transcendental functions. The proof of this elementary inequality is based on the preliminary ...
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NormalizeLogMeanVariance(TransformsCatalog, String, Boolean, String, Int64, Boolean) 建立NormalizingEstimator,其會根據資料的對數計算平均數和變異數正規化。 C# publicstaticMicrosoft.ML.Transforms.NormalizingEstimatorNormalizeLogMeanVariance(thisMicrosoft.ML.TransformsCatalog catalog,stringoutputColumnName,boolfixZero...