dataset

问题 I have a stored procedure that returns multiple tables. How can I execute and read both tables? I have something like this: SqlConnection conn = new SqlConnection(CONNECTION_STRING); SqlCommand cmd = new SqlCommand("sp_mult_tables",conn); cmd.CommandType = CommandType.StoredProcedure); IDataReader rdr = cmd.ExecuteReader(); I'm not sure how to read it...whats the best way to handle this type of query, I am guessing I should read the data into a DataSet? How is the best way to do this? Thanks.

问题 I am not really sure about the difference between CDF (Cumulative Distribution Function) and ECDF (Empirical Cumulative Distribution Function) but I usually utilize a CDF plot to make observations about my data. I have been using R recently and am desperately trying to find out how to plot a CDF and CCDF (Complementary CDF) of my data. All I could find was that R has ecdf but am not really sure if this is what I am looking for. Plotting an ECDF is as simple as: plot.ecdf(data) Does anyone

问题 I am producing a script where I have done many manipulations to a bunch of data and, I do these same manipulations to another dataset. Both data sets have the same rows, columns, and headers. I would like to be able to join the two data sets together where I place dataset A above dataset B. I wouldn't need to headers for dataset B and would instead just clump all of the data together as if they were never really separated in the first place. Is there a simply way to do this? 回答1: Yes. Use

问题 Well. I have a DataTable with multiple columns and multiple rows. I want to loop through the DataTable dynamically basically the output should look as follows excluding the braces : Name (DataColumn) Tom (DataRow) Peter (DataRow) Surname (DataColumn) Smith (DataRow) Brown (DataRow) foreach (DataColumn col in rightsTable.Columns) { foreach (DataRow row in rightsTable.Rows) { //output } } I typed that out and noticed this would not work. Can someone please advice on a better way of doing this?

问题 I am searching some optimized datatypes for "observations-variables" table in Matlab, that can be fast and easily accessed by columns (through variables) and by rows (through observations). Here is сomparison of existing Matlab datatypes: Matrix is very fast, hovewer, it has no built-in indexing labels/enumerations for its dimensions, and you can't always remember variable name by column index. Table has very bad performance, especially when reading individual rows/columns in a for loop (I

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed last year . I am working on sentiment analysis and I am using dataset given in this link: http://www.cs.jhu.edu/~mdredze/datasets/sentiment/index2.html and I have divided my dataset into 50:50 ratio. 50% are used as test samples and 50% are used as train samples and the features extracted from train samples and perform

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed last year . I am working on sentiment analysis and I am using dataset given in this link: http://www.cs.jhu.edu/~mdredze/datasets/sentiment/index2.html and I have divided my dataset into 50:50 ratio. 50% are used as test samples and 50% are used as train samples and the features extracted from train samples and perform

问题 I have various Stata data files. These are located in different folders. I also have a single do file that uses these files, one at a time. Is there a way to use a macro to reference a particular dataset in my do file? For example: local datafile = "C:\filepath\mydata.dta" The idea is to use this later in the code as follows: use `datafile', clear Defining the macro as a global variable works. But I don't want to make it global, so it doesn't prevent me from running two separate programs at a

问题 I have a table which has a column Xyz and it has bit datatype in SQL Server 2008. I'm getting the values from the table through data adapter and I'm storing it in a DataSet and a DataGridView will show the contents from the DataSet In the gridview, for column Xyz , a check_box with/without tick is displayed but I want to display it as a buy/sell as a text instead of checkbox. 回答1: You can handle it in 1 of 2 ways. 1) Instead of returning the data as a bit, do the casting in your query to have

问题 I want to get data from my data access layer into my business layer, then prepare it for use in my UI. So i wonder: is it better to read my data by DataReader and use it to fill a List<BLClasses> or to fill a DataSet and send the DataSet to UI Layer ??. I'm interested in good performance and scalability. 回答1: Your UI layer should be far-removed from your data access strategy - it shouldn't be dealing with raw data. Thus, your UI should communicate solely with your domain objects (directly or