查询词典 set function

If this parameter is set to NULL or an empty string, the function retrieves the type and data for the key's unnamed value.

如果这个参数被设置成NULL或者空字符串，函数重新获得没有命名键值的类型或者数据。

By means of Floquet theory,Lyalpunov function, Hurwitz criterion, linearization, Lasalle invariable set principle,, characteristic line, coincidence degree, estimation of inequality ,numerical simulation and so on, we study two kinds of models with impulsive vaccination.

其中综合运用Floquet 原理、Lyapunov函数、 Hurwitz判据、线性化、 Lasalle不变集、数值模拟、射频映射、分支理论、不等式估计、重合度理论等方法和知识，系统地研究了两类实施脉冲疫苗策略的非线性模型。

Perl details of the variables, operator, pointer, the function set...

详细介绍了perl中的变量、操作符、指针、函数集等等内容。

The basic function of the dynamic simulation algorithm is: Enter a given grammar, and FIRSTVT and LASTVT set output operator precedence analysis table generating algorithm output algorithm of table construction process priority main priority is based on the relationship between structure operator algorithm to draw priority relationship matrix.

动态模拟算法的基本功能是：输入一个给定文法，及FIRSTVT和LASTVT集；输出算符优先分析表生成算法；输出算法优先分析表构造的过程；主要是依据构造算符优先关系的算法来绘制优先关系矩阵表。

Simulation of the priority operator parsing constructor FirstVT mainly grammar and structure LastVT set simulation, operator precedence relations form the structure, function operator priority table structure, the sentence analysis of several parts, such as reduction process.

算符优先语法分析模拟构造器主要包括文法的FirstVT和LastVT集模拟构造，算符优先关系表的构造，算符优先函数表的构造，句子分析归约过程等几个部分。

Value iteration based on the vector set results in the piecewise linear convex form of the optimal value function, which can also be used to obtain the optimal policy.

在向量集上进行的值迭代可以得到最优值函数的分段线性凸函数表示形式，同样也可以得到对应的策略。

Finally, according to the optimal value function, set up forward algorithm for dynamic programming equation and get the result.

最后根据最优值函数建立顺序动态规划方程并求解。

And the expression of its subdifferential is developed in the case that the effective domain of the optimal value function is a non-empty convex set.

最后利用方向导数和次微分导出了广义半无限极大极小规划的一个一阶最优性条件及其等价形式。

Using PH linearization ,the nonlinear partial differential equation was transformed into linear partial differential equation,and then,by introducing a complex function,it was further transformed into a set of two linear differential equations.

应用 PH线性化方法，将非线性偏微分方程转化为线性偏微分方程，引入复函数将复常数偏微分方程变为两个线性实常数微分方程组，并采用小参数迭代法进行求解，近似求得了螺旋槽内气体动压分布的解析解。

Since a partially ordered set has longitudinal and lateral structures, the characterization of poset matroids by rank function is much more complicated than that of the classical matoid.

因为一个偏序集有横向与纵向的结构，因此我们用秩函数来刻画偏序集拟阵要比刻画经典拟阵要复杂得多，但还是有章可寻。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。