139 个回答
how to do real time stocks analysis with dolphinDB and pytho...
1）Yes,this is a good idea. 2) You can use deltas or eachPre. 3) Using the createDailyTimeSeriesEngine engines can be aligned. 4) You can subscribe to the stock list in the client using the Python Streaming API.
回答于 2021-09-12 13:02
C++ API VS2019下同样的代码，DEBUG编译运行报错，Release编译运...
现在用的库是release版本的。若project用debug，库也需要用debug版本编译。
回答于 2021-09-09 14:01
<ChunkInRecovery>openChunks failed
如果想dropDatabase，可以先强制删除Recovery分区： dbName="/stocks_orderbook" fileCond=dbName + "%" t=exec substr(file,strlen(dbName)) from rpc(getControllerAlias(),getClusterChunksStatus) where file like fileCond, state != "COMPLETE" dropPartition(database("dfs:/"+dbName),t,,true) 上例中，数据库名...
回答于 2021-08-21 19:20
用round拼接字符串为什么无效
请用format函数： newCondition = " and (" + uatField + " = " + format(newValue,"0.0000") +" )"
回答于 2021-08-21 18:21
请问股票软件中常用的动态移动平均DMA如何在dolphinDB实现，谢谢...
可参考talib的ema实现。https://gitee.com/dolphindb/DolphinDBModules/blob/master/ta/src/ta.dos
回答于 2021-08-16 18:34