data-stream

Reading USB input stream from ruby.

由 ▼魔方 西西 提交于 2019-12-24 17:09:05
问题 Just a bit of background, I'm working with a raw data stream in Linux Mint (32 bit). It's from my library ruby-buzz, which reads 24-bit lumps out of the data stream file. I've just re-installed my laptop with Linux Mint, 32-bit, and suddenly I'm seeing the error Errno::EINVAL: Invalid argument @ io_fread . ajfaraday@squishy ~ $ sudo chmod 777 /dev/input/by-id/* ajfaraday@squishy ~ $ irb 2.2.1 :001 > path = '/dev/input/by-id/usb-Logitech_Logitech_Buzz_tm__Controller_V1-event-if00' => "/dev

Reading USB input stream from ruby.

由 依然范特西╮ 提交于 2019-12-24 17:08:06
问题 Just a bit of background, I'm working with a raw data stream in Linux Mint (32 bit). It's from my library ruby-buzz, which reads 24-bit lumps out of the data stream file. I've just re-installed my laptop with Linux Mint, 32-bit, and suddenly I'm seeing the error Errno::EINVAL: Invalid argument @ io_fread . ajfaraday@squishy ~ $ sudo chmod 777 /dev/input/by-id/* ajfaraday@squishy ~ $ irb 2.2.1 :001 > path = '/dev/input/by-id/usb-Logitech_Logitech_Buzz_tm__Controller_V1-event-if00' => "/dev

FIFO/Queue buffer specialising in byte streams

由 老子叫甜甜 提交于 2019-12-17 23:18:43
问题 Is there any .NET data structure/combination of classes that allows for byte data to be appended to the end of a buffer but all peeks and reads are from the start, shortening the buffer when I read? The MemoryStream class seems to do part of this, but I need to maintain separate locations for reading and writing, and it doesn't automatically discard the data at the start after it's read. An answer has been posted in reply to this question which is basically what I'm trying to do but I'd

Convert Apache Flink Datastream to a Datastream that makes tumbling windows of 2 events and sum on a value

由 删除回忆录丶 提交于 2019-12-11 16:59:42
问题 I have a Flink Table with the following columns: final String[] hNames = {"mID", "dateTime", "mValue", "unixDateTime", "mType"}; I want to create a DataStream in Apache Flink that makes tumbling windows of a length of 2 each and calculates the average mValue for that window. Below I've used the SUM function since it seems there isnt a AVG function. These windows must be grouped on the mID (is a Integer) or dateTime column. I key the windows by the column mType , since these represent a

Count items in dictionary

由 只谈情不闲聊 提交于 2019-12-11 16:14:38
问题 I need to count the the different IDENTIFIERS and print a number count for the them. The information comes from a data stream that looks like this: IDENTIFIER 7756753.940 receivetest: m s 0x0000069a 8 00 00 00 00 00 e4 8a 9a 7756754.409 receivetest: m s 0x00000663 8 2f 00 62 02 00 e4 8a 9a 7756754.878 receivetest: m s 0x0000069e 8 00 1f 5e 28 34 83 59 1a 7756755.348 receivetest: m s 0x00000690 8 00 18 00 28 34 83 59 1a 7756853.908 receivetest: m s 0x0000069a 8 00 00 00 00 00 e4 8a 9a 7756854

Apache Flink - Send event if no data was received for x minutes

由 流过昼夜 提交于 2019-12-07 08:15:34
问题 How can I implement an operator with Flink's DataStream API that sends an event when no data was received from a stream for a certain amount of time? 回答1: Such an operator can be implemented using a ProcessFunction . DataStream<Long> input = env.fromElements(1L, 2L, 3L, 4L); input // use keyBy to have keyed state. // NullByteKeySelector will move all data to one task. You can also use other keys .keyBy(new NullByteKeySelector()) // use process function with 60 seconds timeout .process(new

how to make Sliding window model for data stream mining?

由 大兔子大兔子 提交于 2019-12-04 09:48:41
问题 we have a situation that a stream (data from sensor or click stream data at server) is coming with sliding window algorithm we have to store the last (say) 500 samples of data in memory. These samples are then used to create histograms, aggregations & capture information about anomalies in the input data stream. please tell me how to make such sliding window. 回答1: If you are asking how to store and maintain these values in a sliding-window manner, consider this simple example which keep

how to make Sliding window model for data stream mining?

由 冷暖自知 提交于 2019-12-03 04:01:05
we have a situation that a stream (data from sensor or click stream data at server) is coming with sliding window algorithm we have to store the last (say) 500 samples of data in memory. These samples are then used to create histograms, aggregations & capture information about anomalies in the input data stream. please tell me how to make such sliding window. If you are asking how to store and maintain these values in a sliding-window manner, consider this simple example which keep tracks of the running mean of the last 10 values of some random stream of data: WINDOW_SIZE = 10; x = nan(WINDOW

Creating an efficient way of sending integers over a network. TCP

由 这一生的挚爱 提交于 2019-12-02 06:30:55
问题 How can I convert integer values to byte arrays and then send them over a byte stream to the client program which converts the byte array back to an integer? My program is a pingpong game. Once run it creates a server which a client connects to over the internet using an object stream right now . All is working well, but it doesn't seem very efficient. By that I mean the ball is stuttering back and forth while it is trying to keep in sync via the update loop . I may have programmed it loosely

Creating an efficient way of sending integers over a network. TCP

由 Deadly 提交于 2019-12-02 00:02:21
How can I convert integer values to byte arrays and then send them over a byte stream to the client program which converts the byte array back to an integer? My program is a pingpong game. Once run it creates a server which a client connects to over the internet using an object stream right now . All is working well, but it doesn't seem very efficient. By that I mean the ball is stuttering back and forth while it is trying to keep in sync via the update loop . I may have programmed it loosely, but it was the best I could come up with. I hope someone who knows a lot more about how this kind of
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