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Modifying a subset of rows in a pandas dataframe

...The df.A==0 expression creates a boolean series that indexes the rows, 'B' selects the column. You can also use this to transform a subset of a column, e.g.: df.loc[df.A==0, 'B'] = df.loc[df.A==0, 'B'] / 2 I don't know enough about pandas internals to know exactly why that works, but the basic is...
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How can I convert a string to upper- or lower-case with XSLT?

...hod of case conversion is translate(): <xsl:variable name="lowercase" select="'abcdefghijklmnopqrstuvwxyz'" /> <xsl:variable name="uppercase" select="'ABCDEFGHIJKLMNOPQRSTUVWXYZ'" /> <xsl:template match="/"> <xsl:value-of select="translate(doc, $lowercase, $uppercase)" /&g...
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Reading Excel files from C#

...ed Properties=Excel 8.0;", fileName); var adapter = new OleDbDataAdapter("SELECT * FROM [workSheetNameHere$]", connectionString); var ds = new DataSet(); adapter.Fill(ds, "anyNameHere"); DataTable data = ds.Tables["anyNameHere"]; This is what I usually use. It is a little different because I u...
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Set database from SINGLE USER mode to MULTI USER

...onnected to it” might be SQL Server Management Studio window itself. Try selecting the master database and running the ALTER query again. share | improve this answer | foll...
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Postgres: SQL to list table foreign keys

... You can do this via the information_schema tables. For example: SELECT tc.table_schema, tc.constraint_name, tc.table_name, kcu.column_name, ccu.table_schema AS foreign_table_schema, ccu.table_name AS foreign_table_name, ccu.column_name AS foreign_column_nam...
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How to convert array to SimpleXML

...de); } else { $xml_data->addChild("$key",htmlspecialchars("$value")); } } } // initializing or creating array $data = array('total_stud' => 500); // creating object of SimpleXMLElement $xml_data = new SimpleXMLElement('<?xml version="1.0"?><data>&...
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How can I use swift in Terminal?

... sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer then you can do one of these: xcrun swift lldb --repl As of Xcode 6.1 - typing swift in the terminal launches the REPL as well. ...
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Can Android Studio be used to run standard Java projects?

...id Studio. If you do not have one, create one. Click File > New Module. Select Java Library and click Next. Fill in the package name, etc and click Finish. You should now see a Java module inside your Android project. Add your code to the Java module you've just created. Click on the drop down to...
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TFS: Updating branch with changes from main

... From Visual Studio, open Source Control Explorer: View | Team Explorer Select your Team Project from Team Explorer, expand it, and double click Source Control In the left-hand pane of Source Control Explorer, select your Team Project. In the right-hand pane, find your mainline branch, right-clic...
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What are the differences between a clustered and a non-clustered index?

...than a clustered index Both types of index will improve performance when select data with fields that use the index but will slow down update and insert operations. Because of the slower insert and update clustered indexes should be set on a field that is normally incremental ie Id or Timestamp. ...