SparkGraphX中类Graph的reverse方法可以()。
A.反转图中所有边的方向
B.按照设定条件取出子图
C.取两个图的公共顶点和边作为新图,并保持前一个图顶点与边的属性
D.合并边相同的属性
A.反转图中所有边的方向
B.按照设定条件取出子图
C.取两个图的公共顶点和边作为新图,并保持前一个图顶点与边的属性
D.合并边相同的属性
A.Graph(vertices,edges,defaultVertexAttr)
B.Graph.fromEdges(RDD[Edge[ED]],defaultValue)
C.Graph.fromEdgeTuples(rawEdges:RDD[(VertexId,VertexId)],defaultValue,)
D.GraphLoader.edgeListFile(sc,filename)
设有关系模式R(A,B,C,D),F={(A,D)→C,C→B}
则:(1) 求出R的所有候选码。
(2) 该模式是哪一类范式,为什么?
A={1.2,3,4,5},R=,简答以下各题.
(1)画出R的关系图.
(2)R是否为A上的等价关系?如果是,求出R的各等价类.
How to Save Web Page Information
You can save the whole web page or part of its contents(text,graph or linkage)as file kept on disk.They can be displayed or used in other files,also sent to other,or printed.
To save web pages,you can;
Save the current web pages in your computer.To do that,single click"save as"on"file"menu,and on the"save web page"dialogue box select the folder for saving web pages,and on the"file name"input the file name of this web page,then single click "save"button;
Duplicate the information from the web page to file.To do that,you select the infor mation on the web page to be saved(if you want to save the whole web page,then single click"all select"button on"edit"menu、and single click"copy"on"edit"menu.Finally,turn to the procedure for editing the information(for example,word),single click the position where the information is stored and then single click the "paste"on"edit"menu.