# FilledColumn A view on a column that replaces missing elements with a default value. ``` struct FilledColumn where Base : OptionalColumnProtocol ``` ## Topics ### Inspecting a Column [`var name: String`](/documentation/TabularData/FilledColumn/name) The name of the column. ### Finding an Element Index [`func argmin() -> Base.Index?`](/documentation/TabularData/FilledColumn/argmin()) Returns the index of the element with the lowest value. [`func argmax() -> FilledColumn.Index?`](/documentation/TabularData/FilledColumn/argmax()) Returns the index of the element with the highest value. ### Accessing Elements [`subscript(Base.Index) -> Base.WrappedElement`](/documentation/TabularData/FilledColumn/subscript(_:)) Retrieves an element at a position in the column type. ### Summarizing a Column [`func summary() -> CategoricalSummary.WrappedElement>`](/documentation/TabularData/FilledColumn/summary()) Generates a categorical summary of the filled column’s elements, including default values. [`func numericSummary() -> NumericSummary`](/documentation/TabularData/FilledColumn/numericSummary()-3ao8s) Generates a numeric summary of the integer column’s elements. [`func numericSummary() -> NumericSummary`](/documentation/TabularData/FilledColumn/numericSummary()-86mgh) Generates a numeric summary of the floating-point column’s elements. ### Getting Statistical Values [`func sum() -> FilledColumn.Element`](/documentation/TabularData/FilledColumn/sum()-5836l) Returns the sum of the integer column’s elements. [`func sum() -> FilledColumn.Element`](/documentation/TabularData/FilledColumn/sum()-2805h) Returns the sum of the floating-point column’s elements. [`func min() -> FilledColumn.Element?`](/documentation/TabularData/FilledColumn/min()) Returns the element with the lowest value. [`func max() -> FilledColumn.Element?`](/documentation/TabularData/FilledColumn/max()) Returns the element with the highest value. [`func mean() -> Double?`](/documentation/TabularData/FilledColumn/mean()-8xs60) Returns the mean average of the integer column’s elements. [`func mean() -> FilledColumn.Element?`](/documentation/TabularData/FilledColumn/mean()-jd3v) Returns the mean average of the floating-point column’s elements. [`func standardDeviation(deltaDegreesOfFreedom: Int) -> Double?`](/documentation/TabularData/FilledColumn/standardDeviation(deltaDegreesOfFreedom:)-4cofd) Returns the standard deviation of the integer column’s elements. [`func standardDeviation(deltaDegreesOfFreedom: Int) -> FilledColumn.Element?`](/documentation/TabularData/FilledColumn/standardDeviation(deltaDegreesOfFreedom:)-27xnl) Returns the standard deviation of the floating-point column’s elements. ### Describing a Column [`var description: String`](/documentation/TabularData/FilledColumn/description) A mirror that reflects the filled column. [`var debugDescription: String`](/documentation/TabularData/FilledColumn/debugDescription) A text representation of the filled column suitable for debugging. [`func description(options: FormattingOptions) -> String`](/documentation/TabularData/FilledColumn/description(options:)) Generates a string description of the filled column. ### Generating a Column by Combining Two Columns ### Generating a Column by Adding a Value ### Generating a Column by Subtracting a Value ### Generating a Column by Multiplying a Value ### Generating a Column by Dividing a Value ### Comparing a Column with a Value ### Supporting Types [`typealias Element`](/documentation/TabularData/FilledColumn/Element) The type of the column’s elements that defines an associated type for the bidirectional collection protocol. [`typealias WrappedElement`](/documentation/TabularData/FilledColumn/WrappedElement) The type of the column’s elements that defines an associated type for the optional column protocol. ### Invoking Protocol Methods ### Default Implementations [CustomStringConvertible Implementations](/documentation/TabularData/FilledColumn/CustomStringConvertible-Implementations) ## Relationships ### Conforms To [`Copyable`](/documentation/Swift/Copyable) [`Collection`](/documentation/Swift/Collection) [`Escapable`](/documentation/Swift/Escapable) [`ColumnProtocol`](/documentation/TabularData/ColumnProtocol) [`Sequence`](/documentation/Swift/Sequence) [`Sendable`](/documentation/Swift/Sendable) [`BidirectionalCollection`](/documentation/Swift/BidirectionalCollection) [`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible) [`SendableMetatype`](/documentation/Swift/SendableMetatype) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)