小编Hon*_*.Wu的帖子

ENV:

• Windows 7的
• msysgit

我git commit说,它说:

warning: LF will be replaced by CRLF. 

这个警告尾巴落后了吗？
我在Windows中编辑文件,行尾是CRLF,就像这张图:

并且git将其更改LF为承诺回购.
所以我认为正确的警告是:

warning: CRLF will be replaced by LF. 

我刚刚运行git init了一个已经存在的git repo.
结果是重新初始化现有的Git存储库

我该怎么撤消这个？
谢谢!

Ipython 0.13.1可以从python库打印一个对象的源,
比如,os.path.abspath ??
但我不能打印我在ipython中通过%ed magic定义的任何对象的源代码,我
做错了什么？
比如,我通过%ed magic定义一个类名:

%ed  

然后

class Name(object):
    """docstring for Name"""
    name = 'hong'
    def __init__(self, arg):
        super(Name, self).__init__()
        self.arg = arg
    def pri():
        print 'class Name'

回到ipython时,我看不到类Name的源代码:

In [59]: Name??
Type:       type
String Form:<class '__main__.Name'>
Docstring:  docstring for Name
Constructor information:
Definition:Name(self, arg)

这是IPython的错误吗？

环境：

• Matplotlib v2.2.2

代码：

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation
from matplotlib.animation import PillowWriter

fig = plt.figure()

def f(x, y):
    return np.sin(x) + np.cos(y)

x = np.linspace(0, 2 * np.pi, 120)
y = np.linspace(0, 2 * np.pi, 100).reshape(-1, 1)
# ims is a list of lists, each row is a list of artists to draw in the
# current frame; here we are just animating one artist, the image, in
# each frame
ims …

ENV:

• Windows 7英文32位
• python 2.7.3
• ipython 0.13.1

我尝试配置:

ipython -i -c "import sys; sys.path.append('path_name')"

但它似乎没有用.
那么什么是正确的解决方案？

或者如何在ipython启动时将当前目录添加到sys.path？
谢谢.

numpy.dot docstring说:

对于2-D阵列,它相当于矩阵乘法,对于1-D阵列相当于矢量的内积(没有复共轭).对于N维,它是a的最后一个轴和b的倒数第二个轴的和积

但它没有说明numpy.dot如何计算具有二维数组的一维数组.那么Numpy如何处理具有二维数组(矩阵)的一维数组(向量)？

我做了一些测试:

In [27]: a
Out[27]: 
array([[0, 1, 2],
       [3, 4, 5],
       [6, 7, 8]])

In [28]: b
Out[28]: array([0, 1, 2])

In [29]: np.dot(a,b)
Out[29]: array([ 5, 14, 23])

In [30]: np.dot(a, b.reshape(-1,1))
Out[30]: 
array([[ 5],
       [14],
       [23]])

In [31]: np.dot(a, b.reshape(-1,1)).ravel() # same as np.dot(a,b)
Out[31]: array([ 5, 14, 23])

In [32]: np.dot(b,a)
Out[32]: array([15, 18, 21])

In [33]: np.dot(b.reshape(1,-1), a)
Out[33]: array([[15, 18, 21]])

In [34]: np.dot(b.reshape(1,-1), a).ravel() # same as np.dot(b,a)
Out[34]: array([15, …

babel-preset-es2015已安装,并且可以使用es6功能,如下所示let a = 2;.
但无法使用es6模块功能import fs from 'fs'如下:

$ babel-node --presets es2015
> let a = 2;
'use strict'
> a
2
> import fs from 'fs';
SyntaxError: repl: Modules aren't supported in the REPL
import fs from 'fs';  
    at File.buildCodeFrameError (/usr/lib/node_modules/babel-cli/node_modules/babel-core/lib/transformation/file/index.js:407:15)
    at NodePath.buildCodeFrameError (/usr/lib/node_modules/babel-cli/node_modules/babel-traverse/lib/path/index.js:149:26)
    at PluginPass.ModuleDeclaration (/usr/lib/node_modules/babel-cli/lib/_babel-node.js:78:20)
    at newFn (/usr/lib/node_modules/babel-cli/node_modules/babel-traverse/lib/visitors.js:262:19)
    at NodePath._call (/usr/lib/node_modules/babel-cli/node_modules/babel-traverse/lib/path/context.js:63:18)
    at NodePath.call (/usr/lib/node_modules/babel-cli/node_modules/babel-traverse/lib/path/context.js:47:17)
    at NodePath.visit (/usr/lib/node_modules/babel-cli/node_modules/babel-traverse/lib/path/context.js:93:12)
    at TraversalContext.visitQueue (/usr/lib/node_modules/babel-cli/node_modules/babel-traverse/lib/context.js:152:16)
    at TraversalContext.visitMultiple (/usr/lib/node_modules/babel-cli/node_modules/babel-traverse/lib/context.js:110:17)
    at TraversalContext.visit (/usr/lib/node_modules/babel-cli/node_modules/babel-traverse/lib/context.js:182:19)

那有什么不对？
谢谢!

有一个bmp图像,如下图所示的第一张图片,其信息列表为下面的第二张图片.但是当在IPython-notebook上使用matplotlib的plt.imshow()函数显示时,它的颜色错误,正如第三张图片所示.所以我能知道原因吗？
谢谢!

原始文件已在dropbox上共享https://dl.dropboxusercontent.com/u/26518813/test2.bmp

在IPython-notebook上显示图像的代码是:

%pylab inline --no-import-all
from PIL import Image
plt.imshow(Image.open("./test/test2.bmp")) 

比如,我已经删除了github.com中的patch-1分支,并运行git fetch origin更新本地repo来跟踪远程,但命令git branch -a仍显示我本地repo跟踪remotes/origin/patch-1.

$ git branch -a
* master
  origin
  remotes/origin/HEAD -> origin/master
  remotes/origin/master
  remotes/origin/patch-1

那么,如何更新我的本地回购？
谢谢!