已知数

如果要想求出未知数，你首先得知道已知数。

If you want to get the unknown number , you should know the known number first .

一个已知数是某数对数的数。

The number of which a given number is the logarithm .

通过已知数可以算出未知数。

The unknown number can be calculated from the data .

测井、数学、地质相结合研究出的储集层参数数学模型是由已知数口井的储层参数用数学方法拟合而成的空间曲面。

It is a space curved surface which is fitted out from known reservoir parameters by mathematical method .

麦凯恩是已知数，是更加安全的人选，堪称政界元老，而奥巴马事事都有待证明。

Mr McCain was the known quantity , the safer choice , literally the elder statesman and Mr Obama had everything to prove .

用于物质的定性定量分析。可用于已知数、未知数的分子量、结构等测定，广泛适用于工业、农业、医药卫生、环境保护、科学研究等各个领域。

Qualitative and quantitative analysis ; Identification of unknown and known samples ; Widely used in industry , agriculture , medical work , environmental protection and scientific researches .

本文主要讨论在非监督学习中，用EM方法求解有限混合分布（已知类别数）未知参数的问题。

We discuss how the EM ( Expectation Maximization ) algorithm can be used for parameter estimation of finite mixture distributions in unsupervised learning .

当然这个表达式很复杂，不过这里的xi和yi都是已知的数。

Of course there are a lot of letters in here , but xi and yi in real life there will be numbers given to you .

本文提出了一种在已知有限数域上产生一类安全椭圆曲线的算法。

This paper presents a method for generating elliptic curves of known order over finite fields .

在已知源数目的条件下，分析了源定位误差与噪声水平的关系。

The relationship between localizing errors and noise level was discussed on the condition that the source number was known .

回归分析是数理统计学中应用最广泛的一个分支，传统的回归学习算法都以经典统计数学的渐近理论为依据，统计规律只有在已知样本数无限多时才显露出来。

Regression analysis is one of the most widely used branch in the mathematical statistics . The traditional regression algorithms are all based on the asymptotic theory of classical statistical mathematics , where the statistical rule is exposed only when the number of samples approximating infinite .

提出了一个从已知的Peclet数确定塔板上液体混合池数的关联式。

A new correlation between the number of mixing pools and the Peclet number of liquid on trays was presented for determining the number of mixing pools from a known Peclet Number .

用荧光偏振免疫分析技术测定冠心病组和对照组血清中同型半胱氨酸含量，用样本均数与已知总体均数的比较方法分析感染因素与同型半胱氨酸浓度的相关性。

To detect the content of homocysteine in serum of coronary heart disease group and of control group with fluorescence of polarization immunoassay . To compare the sample mean with population mean so that the relation between infection and homocysteine could be analyzed .

为了验证论文提出的探测方法的有效性，需要已知尺度分布和数密度的尾流气泡作为基准。

To validate the method of obtaining bubbles number density presented in this paper , a wake bubbles having known size distribution function and number density is necessary to act as benchmark .

在图像纹理的分类识别时，考虑到已知的训练样本数少且不同类别间可能不具有线性关系，所以本文选择支持向量机来实现。

On the process of the image texture classification , we consider that the number of the known training samples is rather limited , and different classes may not be a linear relationship between them . So we choose the support vector machine to accomplish the classification .