大家好,我想在python中并排添加2个2x2数组。最后,我想获得一个2x4数组,该行共享行,第1列和第2列来自第一个数组,第3列和第4列来自第二个数组。我得到一个数组,它求和的数组不并排放置。你能帮我吗?
示例:
Array 1:
[[1 2]
[1 2]]
Array 2:
[[1 2]
[1 2]]
预期结果:
[[1 2 1 2]
[1 2 1 2]]
实际结果:
[[2 4]
[2 4]]
import numpy as np
a = np.matrix('1 2; 1 2')
b = np.matrix('1 2; 1 2')
x = a + b
print(x)
答案 0 :(得分:4)
>>> numpy.concatenate((a, b), axis=1)
matrix([[1, 2, 1, 2],
[1, 2, 1, 2]])
另一个选择是使用np.hstack
:
>>> np.hstack((a, b))
matrix([[1, 2, 1, 2],
[1, 2, 1, 2]])
答案 1 :(得分:2)
<pre>
4. a. Text goes here and when it word
wraps it needs to keep the indent
with the text like so
b. This is a separate field, with its
own caption but needs the same
indentation as above
5. Another separate caption, but this
line does not have sub sections
</pre>
<div id="container">
<ol start="4">
<li>
<ol>
<li>Text goes here and when it word wraps it needs to keep the indent with the text like so</li>
</ol>
</li>
</ol>
<ol start="4" class="empty">
<li>
<ol start="2">
<li>This is a separate field, with its own caption but needs the same indentation as above</li>
</ol>
</li>
</ol>
<ol start="5">
<li class="no-sub">Another separate caption, but this line does not have sub sections</li>
</ol>
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数组的作用方式与python列表不同。 body {
background: url(../images/background.jpg);
background-repeat: no-repeat;
background-position: 0px 0px;
background-attachment: fixed;
background-color: #fff;
-webkit-background-size: calc(100vw) calc(100vh);
-moz-background-size: calc(100vw) calc(100vh);
-o-background-size: calc(100vw) calc(100vh);
background-size: calc(100vw) calc(100vh);
}
运算符可以执行某种列表串联操作,而将其与numpy
数组一起使用时,则在执行矢量加法运算。
相反,您可以展平每个数组并进行串联:
+
[编辑:]
重新阅读您的问题,似乎我误解了您所追求的。 @Thomas的答案在您的情况中更有意义,可以选择使用np.column_stack
:
numpy
答案 2 :(得分:1)
我之所以会这样,是因为加法返回了一个正常的矩阵加法,该法将两个矩阵逐个相加。
尝试使用np.concatenate(),它可能会如@sacul的建议那样有所帮助。