向量自相关函数公式选择 在ms哪个模块中

然而,自相关函数在时间大约是接近。
However, autocorrelation is about proximity in time.
计算了较长时间的热流自相关函数,并得到了导热系数的收敛结果。
We set a relatively long integral time in the calculation of heat current autocorrelation function (HCACF), and got convergent results.
在确定延迟时间量时,传统方法,即利用应力时间序列的自相关函数,对PLC效应应力信号分析存在着极限性。
However, it is suggested that there exists shortcomings for the traditional method which makes use of the self-correlation function in determining time lag in stress series of PLC effect.
通过计算,研究了单链高分子的均方回转半径、均方末端距以及末端距向量自相关函数随时间的演化过程。
Evolutions of the mean square radius of gyration, the mean square end-to-end distance and the autocorrelation function of the end-to-end vector are simulated.
进而又研究了单链高分子的弛豫过程,给出了末端距向量自相关函数的弛豫时间。
Furthermore, the author also studied the relaxation of single polymer chain and obtained the relaxation time of the autocorrelation function of the end-to-end vector.
本文的目的在于,对于线性平稳时间序列的样本、自协方差、自相关和偏相关函数的渐近性质,给出一个比较系统的描述。
The aim of this paper is to give a systematic account of asymptotic properties of the sample autocovariance, autocorrelation and partial autocorrelation functions of linear stationary time series.
给出了时间序列相空间重构中确定最小嵌入维数的伪邻点法及确定时滞参数的自相关函数法;
We discuss the method of the false neighboring and the auto-relativity function for determining the time delay parameter and minimum embedding dimension of the reconstructed time series phase space.
基于自然梯度原则并利用信号的时间相关属性对一类代价函数进行推导,获得一种新的非平稳信号自适应盲分离算法。
A new adaptive blind source separation algorithm of non-stationary signals was presented by using natural gradient rule and time-correlation property of the source signals acting on a cost function.
该方法对自相关函数进行了扩展,并借助于信息熵来确定时滞值的上限,因而能够同时判别时间序列中存在的线性自相关与非线性自相关。
Result shows that the method is effective to discriminate linear and nonlinear correlation characteristics in a comparatively long data series, and suitable for analysis of complex ocean data.
将自相关函数法和伪相图法结合起来,能够更加直观、合理地选择时间延迟。
More visual and reasonable delay time could be selected with the combination of the self-interrelated function method and the pseudo phase portrait method.
利用自相关函数对恒生指数日收盘价时间序列中的自相似性进行了初步的实证和理论分析。
We do the initial identification and the theoretical analysis with the autocorrelation function towards the time series of HSI daily closing quotation.
利用自相关函数对恒生指数日收盘价时间序列中的自相似性进行了初步的实证和理论分析。
We do the initial identification and the theoretical analysis with the autocorrelation function towards the time series of HSI daily closing quotation.
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感谢您的反馈,我们会尽快进行适当修改!在这个意义上,定义效用向量函数来度量每一处理方案的适合程度。
From this sense, utility vector function to measure the degree of suitability of each proposal is presented.
这种貌似离散的非标准定义与一般的向量函数微分的定义是一致的,且在此基础上给出向量函数在一点可微的定义。
The new definition of differential of vector function is consistent with the general, and based on it, vector function that differentiable at a point is defined.
因为MASS向量函数要比对一个标准库函数的重复访问快很多(倍数接近30倍),所以最后得到的性能改善效果将会是惊人的。
Since the MASS vector functions are much faster (by a factor of up to about 30) than a repeated call to a standard library function, the resulting performance improvement can be substantial.
为进行斜齿锥齿轮副的齿面接触分析,并直观显示齿面接触区,利用圆向量函数和球向量函数的矢量回转和坐标变换方法,建立了斜齿锥齿轮齿面接触分析的数学模型;
To analyze and display the contact of skew bevel involute gears, a mathematic model was established by vector gyration and coordinate transform of circle vector functions and sphere vector functions.
另一类变量与向量函数呈非线性关系。 对于后一类变量,用弃舍随机方法先给出位置初值,然后将问题化为线性最小二乘问题,直接解超定方程组。
The overdetermined equations can be solved directly by using the rejection method to give the initial value of the position first and then converting the problem into a linear—square one.
应用推导随机(向量)函数分布的有关知识,给出了均匀总体样本的中位数、样本极差及样本分量乘积的负对数的概率分布。
This paper gives the distribution of sample median, sample range, and the negative logarithm of sample product on the basis of function distribution.
采用向量V函数结合比较原理,研究线性时变离散大系统的不稳定性。
The unstability property of linear, time—dependent discrete, large—scale systems is investigated by the use of vector V—function combined with comparison principle.
那就是梯度,另一个把向量映到函数。
That's gradient. The other one goes from vectors to functions.
本文引入向量水平函数和向量水平集的概念。
This paper introduces two concepts:vector level function and vector level set.
基于基函数向量矩阵的二维离散余弦变换(2D-DCT),本文提出了一种改进的时变自回归(TVAR)模型辨识算法。
In this paper, we first proposed a modified algorithm for time-varying autoregressive (TVAR) model identification based on 2D-DCT of basis functions vector matrix.
在此基础上,得到了向量目标函数既是似凸又是拟凸的多目标最优化问题的G-恰当有效解集是连通的结论。
On the conditions that vector objective function is like-convex and quasi-convex, we obtain the connectedness of G-proper efficient solution set of the multiobjective optimization problem.
利用分离变量法及本征函数向量展开等方法,推导出裂纹尖端的应力奇性解的计算公式。
The method of separation of variables and the method of eigenfunction expansion are used to derive the calculation equations of stress singularities at crack tip.
然而,电力市场电价的高波动性和随机性等特征给支持向量机核函数的选择带来了挑战。
However, the high fluctuation and randomness features of electricity market present a number of challenges for the choosing of kernel functions for SVM.
在多维向量空间中可以对数据场量进行度量、分解和构造向量角度函数。
In multi_dimensional linear vector space, values of data field can be calculated, differentiated, analyzed and the angle function also can be formulated in the space.
分析结果表明:梯度向量平方函数、拉普拉斯算法和二级梯度平方算法在单值性和灵敏度方面都较好;
The results show that gradient square algorithm, Laplacian algorithm and second order gradient square algorithm have good behavior at the unique value and the sensitivity;
提出一种基于支持向量机的航空发动机气路部件故障诊断方法,讨论了支持向量机的核函数选择和参数确定问题,并对“块算法”进行了分析。
In this paper, the support vector machines based fault diagnosis algorithms are developed for aero- engines. The influence of kernel function is discussed and the chunking algorithms are analyzed.
并采用了演化策略对支持向量机的核函数和相关参数自适应地进行选择。
Kernel function and its parameters of individual SVMs can be selected automatically with evolutionary strategy.
给出了一个随机向量的某些函数同分布的充分条件;
Some sufficient conditionS of identical distribution for some functions of a random vectorare given.
进而又研究了单链高分子的弛豫过程,给出了末端距向量自相关函数的弛豫时间。
Furthermore, the author also studied the relaxation of single polymer chain and obtained the relaxation time of the autocorrelation function of the end-to-end vector.
使用者应该熟悉代数以及函数、向量的运算。
The user should know algebra and the handling of functions and vectors.
通过计算,研究了单链高分子的均方回转半径、均方末端距以及末端距向量自相关函数随时间的演化过程。
Evolutions of the mean square radius of gyration, the mean square end-to-end distance and the autocorrelation function of the end-to-end vector are simulated.
但是,其中一个把函数映到向量。
But, one of them goes from functions to vectors.
随后介绍了支持向量机的核函数选择和参数优化过程,在此基础上构造了支持向量机的多故障分类器。
This paper also introduced the choice of kernel function and optimization of parameter about Support Vector Machine, and a Support Vector Machine multi-classifier was constructed based on them.
嵌入的ts()函数通过向量glarp$livingroom创建一个时间序列对象。
The embedded ts() function creates a time series object out of the vector glarp$livingroom.
但它们不一定是,某个以该向量场为梯度的函数的等值线。
But they won't be the level curves of a function for which this is the gradient.
函数matrix()、array()和dim()是用于设置向量的维的简单函数。
The functions matrix(), array(), and dim() are simply convenience functions for setting the dimensions of a vector.
核函数初始被认为是欧几里得向量空间中的函数,但现在核函数已被应用在了更具一般性的表示方法。
Kernels were first considered as functions in Euclidean vector spaces, but they are now also designed to handle more general representations.
文章介绍了数理统计中实数或向量参数的正函数的后验平均、方差和预测密度的近似计算。
This paper introduces the approximate calculation of real number's or of vector parameter positive function's posterior mean, variance and forecasting density in mathematical statistics.
为了提高非线性动态系统辨识质量,提出了新的支持向量机尺度核函数构造方法。
To improve the performances of dynamic system identification, a new method to formulate scaling kernel function for support vector machine was proposed.
为了提高控制图模式识别效果,提出混合核函数支持向量机的模式识别方法。
To improve patterns recognition performance of control chart, a pattern-recognition method based on hybrid kernel was presented.
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>>>设向量a=(m,n),b=(s,t),定义两个向量a,b之间的运算“?”为a?b..
设向量a=(m,n),b=(s,t),定义两个向量a,b之间的运算“?”为a?b=(ms,nt).若向量p=(1,2),p?q=(-3,-4),则向量q等于(  )A.(-3,2)B.(3,-2)C.(-3,-2)D.(-2,-3)
题型:单选题难度:偏易来源:不详
设向量q=(x,y),p?q=(x,2y)=(-3,-4),∴x=-3,y=-2,故 向量q=(-3,-2 ),故选C.
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据魔方格专家权威分析,试题“设向量a=(m,n),b=(s,t),定义两个向量a,b之间的运算“?”为a?b..”主要考查你对&&平面向量基本定理及坐标表示&&等考点的理解。关于这些考点的“档案”如下:
现在没空?点击收藏,以后再看。
因为篇幅有限,只列出部分考点,详细请访问。
平面向量基本定理及坐标表示
&平面向量的基本定理:
如果是同一平面内的两个不共线的向量,那么对这一平面内的任一向量存在唯一的一对有序实数使成立,不共线向量表示这一平面内所有向量的一组基底。
平面向量的坐标运算:
在平面内建立直角坐标系,以与x轴、y轴方向相同的两个单位向量为基底,则平面内的任一向量可表示为,称(x,y)为向量的坐标,=(x,y)叫做向量的坐标表示。基底在向量中的应用:
(l)用基底表示出相关向量来解决向量问题是常用的方法之一.(2)在平面中选择基底主要有以下几个特点:①不共线;②有公共起点;③其长度及两两夹角已知.(3)用基底表示向量,就是利用向量的加法和减法对有关向量进行分解。
用已知向量表示未知向量:
用已知向量表示未知向量,一定要结合图像,可从以下角度如手:(1)要用基向量意识,把有关向量尽量统一到基向量上来;(2)把要表示的向量标在封闭的图形中,表示为其它向量的和或差的形式,进而寻找这些向量与基向量的关系;(3)用基向量表示一个向量时,如果此向量的起点是从基底的公共点出发的,一般考虑用加法,否则用减法,如果此向量与一个易求向量共线,可用数乘。
发现相似题
与“设向量a=(m,n),b=(s,t),定义两个向量a,b之间的运算“?”为a?b..”考查相似的试题有:
872393566266407501411031437601810367Matlab中求自相关函数xcorr和autocorr的区别(转)
(赵伟峰写于)
&&&&&&&Matlab中有两个现成的函数可以求自相关:方法1是利用互相关函数方法2是自相关函数autocorr。
但是对于向量x,只是进行xcorr(x)和autocorr(x),求的的结果却差别很大。除了xcorr求得的序列是一个中心对称的偶函数序列外,数值的大小也不对应。
看了help,然后自己实验了一下,终于找到了原因。首先,autocorr是对序列减去均值后做的自相关,最后又进行了归一化。而且由于自相关本身是偶函数,而xcorr本身是计算互相关的,所以xcorr最终的结果是2*N-1,而autocorr只是取了以中心点N为起始的后面N个序列。因此,如果以向量x为例,x长为N。则用autocorr(x,N-1)能得到的N长度结果。用xcorr需要有以下几步:
&E = mean(x);
&c =xcorr(x2);
&d =c./c(N);
&f =d(N:2*N-1);
可见,求自相关还是用autocorr更方便一些。另外,这里为了方便,只是采用了默认的调用方式,两个函数的具体参数变化还是要看help详细说明,暂不讨论。
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一维向量中分量的个数和自相关函数值的个数有什么样的关系?原理是什么?s=[1 2];r=xcorr(s)r = 2 5 2向量S有2个分向量,r的值有3个s = 1 2 3r=xcorr(s)r = 3.0 14.0 3.0000向量S有3个分向量,r的值有5个s=[1,2,3,4];r=xcorr(s)r = 4.0 20.0 20.0 4.0000向量S有4个分向量,r的值有7个
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r对应自相关函数定义中m的值,m=-(N-1):(N-1),N是数据长度.你看看[r,lags]=xcorr(x).中的lags的返回值就知道了.
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