小编Dyl*_*lan的帖子

我想将具有形状的灰度图像转换为具有形状(height,width)的3通道图像(height,width,nchannels).工作是用a完成的for-loop,但必须有一个简洁的方法.这是程序中的一个代码,有人可以给出一个提示.请指教.

 30         if img.shape == (height,width): # if img is grayscale, expand
 31             print "convert 1-channel image to ", nchannels, " image."
 32             new_img = np.zeros((height,width,nchannels))
 33             for ch in range(nchannels):
 34                 for xx in range(height):
 35                     for yy in range(width):
 36                         new_img[xx,yy,ch] = img[xx,yy]
 37             img = new_img

我只更改搜索路径以通知Xcode opencv所在的位置.这是我的搜索路径:

Framework search path: /usr/local/lib
Library search path: /usr/local/Cellar/opencv/2.4.11/lib
                     /usr/local/Cellar/opencv/2.4.11_1/lib
                     /user/local/lib
Header search path: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include
                    /usr/local/include

错误:

    In file included from /Users/lilisun/Documents/opencv_projects/faceExtractor/faceExtractor/main.cpp:8:
In file included from /usr/local/include/opencv2/objdetect/objdetect.hpp:46:
In file included from /usr/local/include/opencv2/core/core.hpp:49:
In file included from /usr/local/include/opencv2/core/types_c.h:55:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include/assert.h:44:
In file included from /usr/local/include/c++/5.1.0/tr1/stdlib.h:32:
In file included from /usr/local/include/c++/5.1.0/tr1/cstdlib:34:
/usr/local/include/c++/5.1.0/cstdlib:118:11: error: no member named 'div_t' in the global namespace
  using ::div_t;
        ~~^
/usr/local/include/c++/5.1.0/cstdlib:119:11: error: no member named 'ldiv_t' in the global namespace
  using ::ldiv_t;
        ~~^
/usr/local/include/c++/5.1.0/cstdlib:121:11: …

我有两个向量a = c(1,2,3),b = c(1,2,3)

我想测试是否a完全相同b.我知道结果可以给出sum(a == b) == length(a),但有没有优雅的方式？

我将图像放在一个numpy数组中，并使用以下代码绘制它。我如何告诉程序不要绘制轴，例如(0, 100, 200...)

import matplotlib.pyplot as plt
plt.figure()
plt.imshow(output_ndarray)
plt.savefig(output_png)

我正在使用spark并使用HiveContext执行HQL查询.我想table(student)从database(test)蜂巢中删除.那么,这个命令delete test.student会运行吗hivecontext？它可以在teradata中运行,因此我可以在Hive中使用它(在火花中).