首页 \ 问答 \ 在android 2.x上创建Uint8array的替代品(create a substitute of Uint8array on android 2.x)

在android 2.x上创建Uint8array的替代品(create a substitute of Uint8array on android 2.x)

我正在开发一个关于android的phonegap的应用程序。 我希望该应用程序可以在Android 2.3.3和更多。 我在我的代码上使用Uint8array。 这个工作在android 4但不在android 2.我有这个错误:

找不到变量:Uint8array

我做了一些研究,发现android2上不支持uint8array。 我想知道是否有一个类似的功能或一个可以在android 2上运行的库。

谢谢


I'm developping an application on phonegap for android. I would like that the application can work on android 2.3.3 and more. I use Uint8array on my code. this work on android 4 but not on android 2. I've got this error:

can't find variable: Uint8array

I do some research and found that uint8array is not supported on android2. I would like to know if there is a similiar function or a library that work on android 2.

Thank you


原文:https://stackoverflow.com/questions/16735218
更新时间:2023-07-09 21:07

最满意答案

np.savetxt写入一维数组,每行一个元素。

np.savetxt写入每行一行的二维数组。

这解释了为什么scipy.savetxt('y.txt', y...)为您提供了一个长列。 此外,numpy / scipy认为(x, y)是一维元组,而不是二维数组。 这就是你得到的原因

0 1 2 3 4 5
10 11 12 13 14 15

输出。

因此,要获得所需的输出,请传递二维数组。 正如您所指出的,使用np.column_stack可能是最简单的方法:

import numpy as np
np.savetxt(filename, np.column_stack((x,y)), fmt='%g')

要将数据读回xy变量,请使用unpack=True参数:

x, y = np.genfromtxt(filename, unpack=True)

np.savetxt writes 1-dimensional arrays with one element per line.

np.savetxt writes 2-dimensional arrays with one row per line.

This explains why scipy.savetxt('y.txt', y...) gives you one long column. Also, numpy/scipy considers (x, y) to be a 1-dimensional tuple, not a 2-dimensional array. This is why you get

0 1 2 3 4 5
10 11 12 13 14 15

for output.

So, to get the desired output, pass a 2-dimensional array. Using np.column_stack, as you noted, is probably the easiest way:

import numpy as np
np.savetxt(filename, np.column_stack((x,y)), fmt='%g')

To read the data back into x and y variables, use the unpack=True parameter:

x, y = np.genfromtxt(filename, unpack=True)

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