# Clipping, limit, and threshold operations Apply clipping, limit, or threshold rules to the elements in a vector. ## Topics ### Clipping Operations The functions in this group restrict the values in a vector so that they fall within a given range or invert values outside a given range. [`static func clip(U, to: ClosedRange) -> [Double]`](/documentation/Accelerate/vDSP/clip(_:to:)-8jsic) Returns the elements of a double-precision vector clipped to the specified range. [`static func clip(U, to: ClosedRange) -> [Float]`](/documentation/Accelerate/vDSP/clip(_:to:)-20gz4) Returns the elements of a single-precision vector clipped to the specified range. [`static func clip(U, to: ClosedRange, result: inout V)`](/documentation/Accelerate/vDSP/clip(_:to:result:)-3lbii) Calculates the elements of a double-precision vector clipped to the specified range. [`static func clip(U, to: ClosedRange, result: inout V)`](/documentation/Accelerate/vDSP/clip(_:to:result:)-84zw9) Calculates the elements of a single-precision vector clipped to the specified range. [`static func invertedClip(U, to: ClosedRange) -> [Double]`](/documentation/Accelerate/vDSP/invertedClip(_:to:)-8yqtl) Returns a double-precision vector that’s inverted-clipped to the specified range. [`static func invertedClip(U, to: ClosedRange) -> [Float]`](/documentation/Accelerate/vDSP/invertedClip(_:to:)-4pkxw) Returns a single-precision vector that’s inverted-clipped to the specified range. [`static func invertedClip(U, to: ClosedRange, result: inout V)`](/documentation/Accelerate/vDSP/invertedClip(_:to:result:)-5ioal) Calculates a double-precision vector that’s inverted-clipped to the specified range. [`static func invertedClip(U, to: ClosedRange, result: inout V)`](/documentation/Accelerate/vDSP/invertedClip(_:to:result:)-3q12m) Calculates a single-precision vector that’s inverted-clipped to the specified range. [`extern void vDSP_vclip(const float *__A, vDSP_Stride __IA, const float *__B, const float *__C, float *__D, vDSP_Stride __ID, vDSP_Length __N);`](/documentation/Accelerate/vDSP_vclip) Calculates the elements of a single-precision vector clipped to the specified range. [`extern void vDSP_vclipD(const double *__A, vDSP_Stride __IA, const double *__B, const double *__C, double *__D, vDSP_Stride __ID, vDSP_Length __N);`](/documentation/Accelerate/vDSP_vclipD) Calculates the elements of a double-precision vector clipped to the specified range. [`extern void vDSP_vclipc(const float *__A, vDSP_Stride __IA, const float *__B, const float *__C, float *__D, vDSP_Stride __ID, vDSP_Length __N, vDSP_Length *__NLow, vDSP_Length *__NHigh);`](/documentation/Accelerate/vDSP_vclipc) Calculates and counts the elements of a single-precision vector clipped to the specified range. [`extern void vDSP_vclipcD(const double *__A, vDSP_Stride __IA, const double *__B, const double *__C, double *__D, vDSP_Stride __ID, vDSP_Length __N, vDSP_Length *__NLow, vDSP_Length *__NHigh);`](/documentation/Accelerate/vDSP_vclipcD) Calculates and counts the elements of a double-precision vector clipped to the specified range. [`extern void vDSP_viclip(const float *__A, vDSP_Stride __IA, const float *__B, const float *__C, float *__D, vDSP_Stride __ID, vDSP_Length __N);`](/documentation/Accelerate/vDSP_viclip) Calculates the elements of a single-precision vector inverted-clipped to the specified range using the specified stride. [`extern void vDSP_viclipD(const double *__A, vDSP_Stride __IA, const double *__B, const double *__C, double *__D, vDSP_Stride __ID, vDSP_Length __N);`](/documentation/Accelerate/vDSP_viclipD) Calculates the elements of a double-precision vector inverted-clipped to the specified range using the specified stride. [`extern void vDSP_vthr(const float *__A, vDSP_Stride __IA, const float *__B, float *__C, vDSP_Stride __IC, vDSP_Length __N);`](/documentation/Accelerate/vDSP_vthr) Calculates single-precision vector threshold to the specified range. [`extern void vDSP_vthrD(const double *__A, vDSP_Stride __IA, const double *__B, double *__C, vDSP_Stride __IC, vDSP_Length __N);`](/documentation/Accelerate/vDSP_vthrD) Calculates double-precision vector threshold to the specified range. ### Limit Operations [`static func limit(U, limit: Double, withOutputConstant: Double) -> [Double]`](/documentation/Accelerate/vDSP/limit(_:limit:withOutputConstant:)-2d9u6) Returns the double-precision vector test limit. [`static func limit(U, limit: Float, withOutputConstant: Float) -> [Float]`](/documentation/Accelerate/vDSP/limit(_:limit:withOutputConstant:)-8bj65) Returns the single-precision vector test limit. [`static func limit(U, limit: Double, withOutputConstant: Double, result: inout V)`](/documentation/Accelerate/vDSP/limit(_:limit:withOutputConstant:result:)-6apdv) Calculates the double-precision vector test limit. [`static func limit(U, limit: Float, withOutputConstant: Float, result: inout V)`](/documentation/Accelerate/vDSP/limit(_:limit:withOutputConstant:result:)-9v33v) Calculates the single-precision vector test limit. [`extern void vDSP_vlim(const float *__A, vDSP_Stride __IA, const float *__B, const float *__C, float *__D, vDSP_Stride __ID, vDSP_Length __N);`](/documentation/Accelerate/vDSP_vlim) Calculates the single-precision vector test limit using the specified stride. [`extern void vDSP_vlimD(const double *__A, vDSP_Stride __IA, const double *__B, const double *__C, double *__D, vDSP_Stride __ID, vDSP_Length __N);`](/documentation/Accelerate/vDSP_vlimD) Calculates the double-precision vector test limit using the specified stride. ### Threshold Operations [`static func threshold(U, to: Double, with: vDSP.ThresholdRule) -> [Double]`](/documentation/Accelerate/vDSP/threshold(_:to:with:)-77g7l) Returns the elements of the supplied double-precision vector after applying a specified thresholding rule. [`static func threshold(U, to: Float, with: vDSP.ThresholdRule) -> [Float]`](/documentation/Accelerate/vDSP/threshold(_:to:with:)-534ob) Returns the elements of the supplied single-precision vector after applying a specified thresholding rule. [`static func threshold(U, to: Double, with: vDSP.ThresholdRule, result: inout V)`](/documentation/Accelerate/vDSP/threshold(_:to:with:result:)-45b58) Calculates the elements of the supplied double-precision vector after applying a specified thresholding rule. [`static func threshold(U, to: Float, with: vDSP.ThresholdRule, result: inout V)`](/documentation/Accelerate/vDSP/threshold(_:to:with:result:)-8137c) Calculates the elements of the supplied single-precision vector after applying a specified thresholding rule. [`enum ThresholdRule`](/documentation/Accelerate/vDSP/ThresholdRule) Constants that specify vector threshold rules. [`extern void vDSP_vthres(const float *__A, vDSP_Stride __IA, const float *__B, float *__C, vDSP_Stride __IC, vDSP_Length __N);`](/documentation/Accelerate/vDSP_vthres) Calculates single-precision vector threshold with zero fill to the specified range. [`extern void vDSP_vthresD(const double *__A, vDSP_Stride __IA, const double *__B, double *__C, vDSP_Stride __IC, vDSP_Length __N);`](/documentation/Accelerate/vDSP_vthresD) Calculates double-precision vector threshold with zero fill to the specified range. [`extern void vDSP_vthrsc(const float *__A, vDSP_Stride __IA, const float *__B, const float *__C, float *__D, vDSP_Stride __ID, vDSP_Length __N);`](/documentation/Accelerate/vDSP_vthrsc) Calculates single-precision vector threshold with signed constant to the specified range. [`extern void vDSP_vthrscD(const double *__A, vDSP_Stride __IA, const double *__B, const double *__C, double *__D, vDSP_Stride __ID, vDSP_Length __N);`](/documentation/Accelerate/vDSP_vthrscD) Calculates double-precision vector threshold with signed constant to the specified range. --- Copyright © 2026 Apple Inc. 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