数量数组
QuantityArray 允许有效储存和 Quantity 对象的数组操作,这对有物理单位的数据分析而言是理想条件. 在全系统继续数量集合,一些函数现在可理解并返回 QuantityArray 对象.
抽样 QuantityDistribution 对象.
In[1]:=
![Click for copyable input](assets.zh/arrays-of-quantities/In_1.png)
RandomVariate[ParetoDistribution[Quantity[500., "USDollars"], 4], 300]
Out[1]=
![](assets.zh/arrays-of-quantities/O_1.png)
QuantityArray 对象等价于 Quantity 元素的正态数组.
In[2]:=
![Click for copyable input](assets.zh/arrays-of-quantities/In_2.png)
RandomVariate[ParetoDistribution[Quantity[500., "USDollars"], 4], 300];
Normal[Take[%, 10]]
Out[2]=
![](assets.zh/arrays-of-quantities/O_2.png)
计算或下载地理数据数组,比如海拔或磁场数据.
In[3]:=
![Click for copyable input](assets.zh/arrays-of-quantities/In_3.png)
GeoElevationData[Entity["Country", "UnitedStates"]]
Out[3]=
![](assets.zh/arrays-of-quantities/O_3.png)
In[4]:=
![Click for copyable input](assets.zh/arrays-of-quantities/In_4.png)
GeomagneticModelData[
Entity["GeographicRegion", "Antarctica"], "Magnitude"]
Out[4]=
![](assets.zh/arrays-of-quantities/O_4.png)
操作经度纬度角度的数组.
In[5]:=
![Click for copyable input](assets.zh/arrays-of-quantities/In_5.png)
GeoElevationData[
Entity["Country", "UnitedStates"], "Undulation", GeoPosition]
Out[5]=
![](assets.zh/arrays-of-quantities/O_5.png)
In[6]:=
![Click for copyable input](assets.zh/arrays-of-quantities/In_6.png)
GeoElevationData[
Entity["Country", "UnitedStates"], "Undulation", GeoPosition];
LatitudeLongitude[%]
Out[6]=
![](assets.zh/arrays-of-quantities/O_6.png)
获取中国的重力场的垂直组成的数据数组.
In[7]:=
![Click for copyable input](assets.zh/arrays-of-quantities/In_7.png)
data = GeogravityModelData[Entity["Country", "China"],
"DownComponent"]
Out[7]=
![](assets.zh/arrays-of-quantities/O_7.png)
检测重力场和该区域上 9.81 的标准值如何不同.
In[8]:=
![Click for copyable input](assets.zh/arrays-of-quantities/In_8.png)
contourplot =
ListContourPlot[data - Quantity[1, "StandardAccelerationOfGravity"],
Frame -> False, PlotRangePadding -> 0,
ColorFunction -> "SolarColors"]
Out[8]=
![](assets.zh/arrays-of-quantities/O_8.png)
将等高线图覆盖在中国地图上方.
显示完整的 Wolfram 语言输入
Out[9]=
![](assets.zh/arrays-of-quantities/O_9.png)