# simd_double1 A vector of one 64-bit floating-point element. ``` typealias simd_double1 = Double ``` ## Topics ### Common Functions [`step(_:edge:)`](/documentation/simd/step(_:edge:)-382a5) [`simd_step(_:_:)`](/documentation/simd/simd_step(_:_:)-8mpre) [`simd_clamp(_:_:_:)`](/documentation/simd/simd_clamp(_:_:_:)-1ktlk) Returns each element in a vector clamped to a specified range. [`simd_fract(_:)`](/documentation/simd/simd_fract(_:)-1wsn4) Returns the fractional part of each element in a vector. [`sign(_:)`](/documentation/simd/sign(_:)-iwmp) Returns the sign of each element in a vector. [`simd_sign(_:)`](/documentation/simd/simd_sign(_:)-937ee) Returns the sign of each element in a vector. ### Interpolation Functions [`simd_smoothstep(_:_:_:)`](/documentation/simd/simd_smoothstep(_:_:_:)-5839l) Returns an element-wise smoothly interpolated value between two vectors. [`simd_mix(_:_:_:)`](/documentation/simd/simd_mix(_:_:_:)-6aqwp) Returns an element-wise linearly interpolated value between two vectors. ### Extrema Functions [`min(_:_:)`](/documentation/simd/min(_:_:)-7rmn) Returns the minimum value of each element in a vector. [`simd_min(_:_:)`](/documentation/simd/simd_min(_:_:)-x4en) Returns the minimum value of each element in a vector. [`max(_:_:)`](/documentation/simd/max(_:_:)-3puhr) Returns the maximum value of each element in a vector. [`simd_max(_:_:)`](/documentation/simd/simd_max(_:_:)-9ibgs) Returns the maximum value of each element in a vector. ### Math Functions [`simd_muladd(_:_:_:)`](/documentation/simd/simd_muladd(_:_:_:)-9hwx1) Returns the multiply-add result for corresponding elements in three vectors. ### Reciprocal and Reciprocal Square Root Functions [`recip(_:)`](/documentation/simd/recip(_:)-8b6ef) Returns the reciprocal of each element in a vector. [`simd_recip(_:)`](/documentation/simd/simd_recip(_:)-7ylz3) Returns the reciprocal of each element in a vector. [`simd_fast_recip(_:)`](/documentation/simd/simd_fast_recip(_:)-1h1e) Returns the fast reciprocal of each element in a vector. [`simd_precise_recip(_:)`](/documentation/simd/simd_precise_recip(_:)-6qb0h) Returns the precise reciprocal of each element in a vector. [`rsqrt(_:)`](/documentation/simd/rsqrt(_:)-7h0u6) Returns the reciprocal square root of each element in a vector. [`simd_rsqrt(_:)`](/documentation/simd/simd_rsqrt(_:)-4ygr4) Returns the reciprocal square root of each element in a vector. [`simd_fast_rsqrt(_:)`](/documentation/simd/simd_fast_rsqrt(_:)-43tvc) Returns the fast reciprocal square root of each element in a vector. [`simd_precise_rsqrt(_:)`](/documentation/simd/simd_precise_rsqrt(_:)-5fl9s) Returns the precise reciprocal square root of each element in a vector. --- 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)