The identification of nonlinear spatiotemporal dynamical systems given by partial differential equations has attracted a lot of attention in the past decades. Several methods, such as searching principle-based algorithms, partially linear kernel methods, and coupled lattice methods, have been developed to address the identification problems. However, most existing methods have some restrictions on sampling processes in that the sampling intervals should usually be very small and uniformly distri
2021-02-22 14:05:54
1.46MB
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A finite-time convergent Zhang neural network and its application to real-time matrix square root finding
2021-02-22 09:07:54
488KB
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A compact quadruple-mode square ring loaded resonator (SRLR) is proposed in this letter. Distinct mode splitting characteristics of the quadruple-mode SRLR are investigated and explained by using even- and odd-mode analysis. It results to
2021-02-21 19:10:59
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方阵
目标
练习使用.each方法遍历数组。
练习对数组的每个元素进行操作。
指示
您将构建一个方法square_array ，该方法将数字数组中的每个元素平方，并返回一个包含这些平方数字的新数组。 使用迭代器并实现自己的逻辑，不要使用.each以外的任何内置数组方法（例如.collect ， .inject ）。
您可以问自己几个问题：
在数组上调用.each的返回值是多少？
如何在数组的每个元素上进行操作，还如何收集或存储这些元素？
我如何平方一个数字？ 提示：有多种方法可以做到！ Google Ruby的指数运算符，或参考上一课中有关简单数学的内容。
先进的
一旦测试通过，请查看是否可以使用更高级别的迭代器（例如.collect 。
期望例子
numbers = [ 1 , 2 , 3 ]
square_array ( numbers )
# => [1,4,9])
new
2021-02-19 17:07:04
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线性拟合的matlab仿真代码，包含数据点的收集、一般最小二乘算法、正交回归算法，画图等。其中数据点的收集还包括曲线的数据点收集。
2020-01-03 11:30:35
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regression shrinkage and selection via the lasso,robert tibshirani最初关于lasso的论文。
2019-12-21 20:27:30
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Miroslav Balda为非线性最小误差优化写的文档，包括梯度法，牛顿法，LM法，QUASI-NEWTON等
2019-12-21 20:19:36
360KB
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