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numpy模块 一、numpy简介 numpy官方文档 numpy是Python的一种开源的数值计算扩展库。这种库可用来存储和处理大型numpy数组，比Python自身的嵌套列表结构要高效的多（该结构也可以用来表示numpy数组）。 numpy库有两个作用： 区别于list列表，提供了数组操作、数组运算、以及统计分布和简单的数学模型 计算速度快，甚至要由于python内置的简单运算，使得其成为pandas、sklearn等模块的依赖包。高级的框架如TensorFlow、PyTorch等，其数组操作也和numpy非常相似。 二、为什么用numpy lis1 = [1, 2, 3] lis2 = [4, 5, 6] lis1 [1, 2, 3] lis2 [4, 5, 6] 如果我们想让 lis1 * lis2 得到一个结果为 lis_res = [4, 10, 18] ，非常复杂。 三、创建numpy数组 numpy数组即numpy的ndarray对象，创建numpy数组就是把一个列表传入np.array()方法。 import numpy as np # np.array? 相当于pycharm的ctrl+鼠标左键 # 创建一维的ndarray对象 arr = np.array([1, 2, 3]) print(arr, type(arr)) [1 2 3] <class

I'm using JavaFX to move 3D cubes around by mouse drag. The cube should stay on the plane spanned by x and z axis. My solution works fairly well, however if I move the cube too fast with my mouse or when it encounters an object with a certain depth (y-Axis), it is assumed, that the mouse is moving on the y-Axis and the cube starts jumping forward or backwards. Is there a way to restrict the mouse to the xz-plane? A more complicated solution would be projecting the y length back to the xz-plane, but I got no clue how. I looked at JavaFX Moving 3D Objects , but couldn't adapt it to my case. My

1. 一定要对数据进行归一化的预处理 train -= np.mean(train, axis = 0) # zero-center train /= np.std(train, axis = 0) # normalize test -= np.mean(test,axis=0) test /= np.std(test,axis=0) 2. 要用正交化初始化lstm 的weight值，如果可能的话，也可以将gate的bias设为0 def init_weight(self): for name, param in self.lstm.named_parameters(): if 'bias' in name: nn.init.constant(param, 0.0) print('\nbias init done') elif 'weight' in name: nn.init.orthogonal(param) print('\nweight init done') 3. 可以在定义的时候加入dropout，一般设为0.5 4. batch_size不要设太大，我设的8感觉就不错（当然也有人说要大些，见仁见智） 5.learning_rate一般取0.001 来源： CSDN 作者： xuzhaoqingbuaa 链接： https://blog.csdn.net

代码： %% ------------------------------------------------------------------------ %% Output Info about this m-file fprintf('\n***********************************************************\n'); fprintf(' <DSP using MATLAB> Problem 8.43 \n\n'); banner(); %% ------------------------------------------------------------------------ % Digital Highpass Filter Specifications: wphp = 0.4*pi; % digital passband freq in rad wshp = 0.3*pi; % digital stopband freq in rad Rp = 1.0; % passband ripple in dB As = 40; % stopband attenuation in dB Ripple = 10 ^ (-Rp/20) % passband ripple in absolute Attn = 10 ^ (-As

I have written a function module that takes the argument of two variables. To plot, I had x, y = pylab.ogrid[0.3:0.9:0.1, 0.:3.5:.5] z = np.zeros(shape=(np.shape(x)[0], np.shape(y)[1])) for i in range(len(x)): for j in range(len(y[0])): z[i][j] = fancyFunction(x[i][0], y[0][j]) pylab.imshow(z, interpolation="gaussian") The image I get is the following: But when I tried rescaling the x and y axis to match the ranges of [0.3:0.9:0.1, 0.:3.5:.5] thru pylab.imshow(z, interpolation="gaussian", extent=[.3,.9,0.,3.5]) I get I've been googling for hours but still couldn't find a way to make a square

How can I go about removing the box around an xyplot , while keeping the axis scale tick marks? In the spirit of Edward Tufte's minimalist data graphic aesthetic, these axis lines are "non-data ink," and can (should?) be "erased." library(lattice) my.df <- data.frame(x=-10:10) my.df$y <- my.df$x^2 xyplot(y~x,data=my.df) It seems that the trellis display parameters (e.g. axis.line$col ) control both the axis lines and axis ticks together: xyplot(y~x,data=my.df, par.settings=list(axis.line=list(col="transparent"))) ...which is not the desired result, so it doesn't look like there's a simple way

I am trying to solve the below issue for last couple of days but still not able to resolve it. I have searched lots of forums but all in vain. * Little bit of history: My code was working well in the devp env but for accessing the production sever I received new URL and three new certificates after successfully including the certificates in new trust store file.I am facing below issue. Please help. 2013-11-25 11:32:30,373 INFO[BuilderUtil] OMException in getSOAPBuilder org.apache.axiom.om.OMException: com.ctc.wstx.exc.WstxUnexpectedCharException: Unexpected character '"' (code 34) in DOCTYPE