broadcast

问题 I have a set of matrices collected in a 3-D array with shape (1222, 47, 47) , and a set of vectors in a 2-D array with shape (1222, 47) . Is there a broadcasting way to multiply each [47x47] matrix with its corresponding [47] vector? With a full loop, this would be numpy.vstack([A[n, :, :].dot(xb[n, :]) for n in range(A.shape[0])]) which is okay for 1222 elements, but I might have a lot more later. I tried if dot , matrix_multiply , inner , or inner1d would fit the bill, in combination with

问题 When applying broadcast variable with collectasmap(), not all the values are included by broadcast variable. e.g. val emp = sc.textFile("...text1.txt").map(line => (line.split("\t")(3),line.split("\t")(1))).distinct() val emp_new = sc.textFile("...text2.txt").map(line => (line.split("\t")(3),line.split("\t")(1))).distinct() emp_new.foreach(println) val emp_newBC = sc.broadcast(emp_new.collectAsMap()) println(emp_newBC.value) When i checked the values within emp_newBC I saw that not all the

问题 I would appreciate any help/feedback on this issue. I'm developing an Asynchronous socket connection in C#, i would like to set a broadcast client receiver such that it broadcast local network servers and then it receives the messages from the local servers. the main issue is that first i want to broadcast to different servers from one client and then retrieve the ip addresses from all the servers. here is part of the client code. also the server side works fine. public void

问题 I have developed a client server UDP application. The Server UDP socket is set to be a BROADCAST UDP Socket. The code of both sides does not generate any error, but the message sent from BROADCAST UDP SERVER Side is not Received at client side. Kindly have a look at my code, i know there is some blunder I can't figure out. I really need help: SERVER: #define PORT 8888 //The port on which to listen for incoming data int main() { SOCKET s; struct sockaddr_in serverSocket, clientSocket; char

问题 I am using a simple Python based web socket application: from SimpleWebSocketServer import WebSocket, SimpleWebSocketServer class SimpleEcho(WebSocket): def handleMessage(self): if self.data is None: self.data = '' # echo message back to client self.sendMessage(str(self.data)) def handleConnected(self): print self.address, 'connected' def handleClose(self): print self.address, 'closed' server = SimpleWebSocketServer('', 8000, SimpleEcho) server.serveforever() It echoes messages sent by each

问题 I have the following array in NumPy: A = array([1, 2, 3]) How can I obtain the following matrices (without an explicit loop)? B = [ 1 1 1 2 2 2 3 3 3 ] C = [ 1 2 3 1 2 3 1 2 3 ] Thanks! 回答1: Edit2: The OP asks in the comments how to compute n(i, j) = l(i, i) + l(j, j) - 2 * l(i, j) I can think of two ways. I like this way because it generalizes easily: import numpy as np l=np.arange(9).reshape(3,3) print(l) # [[0 1 2] # [3 4 5] # [6 7 8]] The idea is to use np.ogrid . This defines a list of

问题 For example, if I want to know when Youtube is opened, is there any broadcast associated with it? I know of course I can poll the logcat message to check the activity. But can I do it through broadcast since it will be much less power-hungry. This link seems to indicate it is impossible:< How to Track App Usage in Android? How to detect when an activity is launched? 回答1: In adroid, is there any broadcast when some app is opend? No, for obvious privacy reasons. 来源： https://stackoverflow.com

问题 I have a thread that is Broadcasting UDP packets. I have another thread that is listening for the same broadcasts. This is so my application can detect other instances on the network. However I have a problem that when one instance broadcasts it picks up itself and thinks it is itself another node. My question is how can you RELIABLY determine that a packet has come from yourself so it can be ignored? I say reliably because I know you can call setLoopbackMode(true) on your sockets to prevent

问题 I'm trying to send a UDP broadcast but wireshark isn't reporting any traffic. Here's the snippet that does the sending: void SendBroadcast() { String^ ip = "255.255.255.255"; int port = 30718; String^ message = "test"; UdpClient^ udpClient = gcnew UdpClient(); udpClient->EnableBroadcast = true; IPEndPoint^ ipDest = gcnew IPEndPoint(IPAddress::Parse(ip), port); cli::array<unsigned char>^ dgram = Encoding::ASCII->GetBytes(message); int bytesSent = udpClient->Send(dgram, dgram->Length, ipDest);

问题 I'm trying to send a UDP broadcast but wireshark isn't reporting any traffic. Here's the snippet that does the sending: void SendBroadcast() { String^ ip = "255.255.255.255"; int port = 30718; String^ message = "test"; UdpClient^ udpClient = gcnew UdpClient(); udpClient->EnableBroadcast = true; IPEndPoint^ ipDest = gcnew IPEndPoint(IPAddress::Parse(ip), port); cli::array<unsigned char>^ dgram = Encoding::ASCII->GetBytes(message); int bytesSent = udpClient->Send(dgram, dgram->Length, ipDest);