dataset

问题 Let's say for each student, I have a note of an exam and I need to calculate the percentile rank ... of each question, each group of question and total exam (each student). Do to that I need, for each question, group of question, and total exam: 1) x = the score (That I have of course) 2) the count of score above x 3) the count of score equal to x 4) the count total of score Do to that it looks like I need to use sub-select for me, in a T-SQL query. Calculate everything inside a big dataset

问题 I'm trying to read a dataset as xml and load it into an XML Document. XmlDocument contractHistoryXMLSchemaDoc = new XmlDocument(); using (MemoryStream ms = new MemoryStream()) { //XmlWriterSettings xmlWSettings = new XmlWriterSettings(); //xmlWSettings.ConformanceLevel = ConformanceLevel.Auto; using (XmlWriter xmlW = XmlWriter.Create(ms)) { xmlW.WriteStartDocument(); dsContract.WriteXmlSchema(xmlW); xmlW.WriteEndDocument(); xmlW.Close(); using (XmlReader xmlR = XmlReader.Create(ms)) {

问题 I have a data set with 400 observations of 4 digit codes which I would like to pad with a space on both sides ex. Dataset obs code 1 1111 2 1112 3 3333 . . . 400 5999 How can I go through another large data set and replace every occurrence of any of the padded 400 codes with a " ". ex. Large Dataset obs text 1 abcdef 1111 abcdef 2 abcdef 1111 abcdef 1112 8888 3 abcdef 1111 abcdef 11128888 ... Data set that I want ex. New Data set obs text 1 abcdef abcdef 2 abcdef abcdef 8888 3 abcdef abcdef

问题 The following picture shows the query and its result with no variables: The next one shows the same query with a variable and a different result: This how the parameter was set just before the query execution: I have also tried setting the parameter without '' but it produces the same result. Any clue about what's going on? Any help would be greatly appreciated. NOTE: The DBMS is MySql 回答1: This weird issue is due to the fact that SSRS is connected to MySQL by ODBC connector; therefore, the

问题 dataset allows us to do: x = rand(10, 1); y = rand(10, 1); d = dataset(x, y); d will have 2 variables with name 'x' and 'y' and content x and y - variable names are obtained from the workspace. The dataset() call above is equivalent to: d = dataset({'x', x}, {'y', y}); when the names are specified. Now if I have a subclass of dataset: classdef mydataset < dataset properties end methods function spec = mydataset(varargin) spec = spec@dataset(varargin{:}); % Add some more things to this

问题 For connection database and reading data, I am using a dataset which read connection string from Web.config file. Everything working in Visual Studio 2013. But when I opened this project in Visual Studio 2017, I can't configure. It errors: Unable to find connection string xxxx. the connection string could not be found in application settings or the data provider associated with the connection string could not be loaded 回答1: This is a TableAdapter error. TableAdapters provide communication

问题 Say I am loading MNIST from torchvision.datasets.MNIST, but I only want to load in 10000 images total, how would I slice the data to limit it to only some number of data points? I understand that the DataLoader is a generator yielding data in the size of the specified batch size, but how do you slice datasets? tr = datasets.MNIST('../data', train=True, download=True, transform=transform) te = datasets.MNIST('../data', train=False, transform=transform) train_loader = DataLoader(tr, batch_size

问题 I need to refresh dbgrid constantly, in real time. Close and open dataset works fine, but blink the dbgrid. What can I do to avoid this? I'd like a solution like Ajax, that update only the necessary. Thanks 回答1: Have you tried to use Disable- & EnableControls ? DataSet.DisableControls; try DataSet.Close; DataSet.Open; finally DataSet.EnableControls; end; Furthermore, it should be possible to just call DataSet.Refresh instead of closing and opening to get the same result. 回答2: I use this in my

问题 DataSets were one of the big things in .NET 1.0 and even now when using .NET 3.5 I still find myself having to use them....especially when I have to call a stored proc which returns a dataset which I then end up having to manually transform into an object to make it easier to work with. I've never really liked DataSets and have found them annoying to use...and as a result I've tended to keep my knowledge about them to a bare minimum (probably a very bad thing!). I also prefer to quickly

问题 I connected my Google Drive to Google Colab with this code: # Load the Drive helper and mount from google.colab import drive # This will prompt for authorization. drive.mount('/content/drive') Now when I want to read a series of folders containing images in my drive, it runs very slow compared to my pc! And I've noticed that if I run the code a second time, folders which have been already read in the previous run are loaded faster. Do you have any suggestions for this problem? Thanks. 来源：