indexing

问题 I have a multiline textbox where the user can edit text. In a statusbar I'd like to show the current line / character index. I know I can get the CaretIndex, and use GetLineIndexFromCharacterIndex to get the line-index. But how would I go about binding that into the statusbar ? 回答1: I'd use an attached behavior for that. The behavior can listens to changes with SelectionChanged and update two attached properties CaretIndex and LineIndex accordingly. <TextBox Name="textBox" AcceptsReturn="True

问题 I have a solr schema like this <fields> <field name="id" type="string" indexed="false" stored="true" required="true" /> <field name="product" type="string" indexed="true" stored="true" required="true" /> <field name="vendor" type="string" indexed="true" stored="true" required="true" /> <field name="language" type="string" indexed="true" stored="true" required="true" /> <field name="TotalInvoices" type="float" indexed="true" stored="true" required="true"/> </fields> I am querying the schema

问题 I have created a composite index on a property in titan 1.0. Now I want to do a case insensitive search on that property. Composite index being created as below : TitanManagement mgmt = graph.openManagement(); TitanManagement.IndexBuilder nameIndexBuilder = mgmt.buildIndex("name_comp_idx", Vertex.class).addKey("name"); titanGraphIndex = nameIndexBuilder.buildCompositeIndex(); Vertex : TitanVertex vertex= graph.addVertex(T.label, "company"); entity.property("name", "APPLE"); Below query is

问题 Im using MYSQL Server 5.0 and im trying to use the next sentence of SQL Server and is not working at all. Please is there any way to apply this to Mysql also. Thank you very much. CREATE NONCLUSTERED INDEX [IX_Dave_General] ON [dbo].[Stock] ( [ArticleID] ASC, [TranDate] DESC, [TranCode] ASC ) INCLUDE ( [Items], [Price]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON

问题 Im using MYSQL Server 5.0 and im trying to use the next sentence of SQL Server and is not working at all. Please is there any way to apply this to Mysql also. Thank you very much. CREATE NONCLUSTERED INDEX [IX_Dave_General] ON [dbo].[Stock] ( [ArticleID] ASC, [TranDate] DESC, [TranCode] ASC ) INCLUDE ( [Items], [Price]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON

问题 I have a NumPy array arr and an (inverse) mask mask . For simplicity let us assume they are both 1d. I want to change the n th non-masked value in arr . An example: import numpy as np arr = np.arange(5) mask = np.array((True, False, True, True, False)) Unfortunately, arr[mask][-1] = 100 which I expected to return array([0, 1, 2, 100, 4]) does not work due to the reasons outlined in NumPy array views on non-consecutive items. A workaround would be to store the allowed values in a new variable,

问题 I have a NumPy array arr and an (inverse) mask mask . For simplicity let us assume they are both 1d. I want to change the n th non-masked value in arr . An example: import numpy as np arr = np.arange(5) mask = np.array((True, False, True, True, False)) Unfortunately, arr[mask][-1] = 100 which I expected to return array([0, 1, 2, 100, 4]) does not work due to the reasons outlined in NumPy array views on non-consecutive items. A workaround would be to store the allowed values in a new variable,

问题 I am beginning to research on content indexing implementation, and was having a look at Whoosh (https://pypi.python.org/pypi/Whoosh/). I am curious to know where Whoosh stores its content physically - Is it using files? 回答1: Whoosh uses a pluggable storage system; if you use the create_in() function then a FileStorage() class is used that stores indexes in files in a directory. See the Whoosh quickstart: Once you have the schema, you can create an index using the create_in function: import os

问题 This question already has answers here : In an array of objects, fastest way to find the index of an object whose attributes match a search (17 answers) Closed 10 months ago . In 2019, if I am handling an array of objects, with a length north of say 15000 and I need to find an index of an object by value, which of the following methods is going to be my best option performance-wise? Six year old 'answer': In an array of objects, fastest way to find the index of an object whose attributes

问题 I have a table in a Mysql db that I want to use multicolumn indexing on. How can I do this in rails w/o using the mysql console? 回答1: Inside a migration definition you can do it like this: add_index :table_name, [:column1, :column2] 来源： https://stackoverflow.com/questions/3825762/index-multiple-columns-w-ruby-on-rails