maximum noise fraction
时间: 2023-10-19 08:08:36 浏览: 56
Maximum noise fraction (MNF) is a signal processing technique used in remote sensing to remove unwanted sources of noise and enhance the signal of interest in hyperspectral images. It uses a linear transform to decompose the original hyperspectral data into three components: noise, signal, and residual. The noise component is then minimized by applying an orthogonal transformation, leaving behind the enhanced signal and residual components.
相关问题
python fraction函数
在Python中,`fraction`函数并不存在。然而,Python标准库中提供了一个名为`fractions`的模块,其中包含了处理分数的类和函数。
要使用`fractions`模块,你需要先导入它:
```python
from fractions import Fraction
```
接下来,你可以使用`Fraction`类来创建和操作分数:
```python
# 创建分数
a = Fraction(3, 4) # 创建一个分子为3,分母为4的分数
# 进行分数运算
b = Fraction(1, 2)
c = a + b # 分数相加
# 输出结果
print(c) # 输出分数结果
print(float(c)) # 输出分数的浮点数表示
```
上述代码中,我们使用`Fraction`类创建了两个分数,并进行了加法运算。最后输出了结果。`Fraction`类还支持其他的运算符和方法,如减法、乘法、除法、比较等。
希望这能帮助到你处理分数相关的操作!
Android resource fraction
Android resource fraction refers to the ability to specify resource values as fractions or percentages of a parent resource. This is commonly used in Android development to create responsive layouts that adapt to different screen sizes and resolutions.
For example, instead of specifying a fixed width or height for a view, you can use resource fractions to define the size relative to the parent container. This allows the view to scale proportionally when the container's size changes.
To use resource fractions in Android, you can define them in XML resource files using the "fraction" unit. For instance, you can set the width of a view to half of the parent container by using a fraction value of "0.5".
Here's an example of how you can use resource fractions in an XML layout file:
```xml
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<View
android:layout_width="@fraction/0.5"
android:layout_height="0dp"
android:layout_weight="1"
android:background="@color/red" />
<View
android:layout_width="@fraction/0.5"
android:layout_height="0dp"
android:layout_weight="1"
android:background="@color/blue" />
</LinearLayout>
```
In this example, two views are placed inside a LinearLayout with a vertical orientation. Both views have a width defined as half of the parent container, using the "@fraction/0.5" resource value.
Using resource fractions can help create more flexible and responsive UI designs in Android applications.
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