Add snippet and explain seeding.

post/2024-10-07-metal-1.4.md

@@ -22,9 +22,37 @@ values can be generated for with `Metal.randn` and `Metal.randn!`, while `Float1
 supported by the MPS library and will always fall back to the GPUArrays implementation.
 
 The easiest way to use these is to use the Metal convenience functions `Metal.rand[n][!]` as
-you would the usual functions from the Random.jl standard library. However, the Random.jl
-methods can also be used by providing the appropriate `RNG` either from `MPS.default_rng()`
-or `MPS.RNG()` to the standard `Random.rand[n][!]` functions.
+you would the usual functions from the Random.jl standard library:
+
+```julia-repl
+julia> a = Metal.rand(Float32, 2)
+2-element MtlVector{Float32, Metal.PrivateStorage}:
+ 0.95755994
+ 0.7110207
+
+julia> Metal.randn!(a)
+2-element MtlVector{Float32, Metal.PrivateStorage}:
+ 1.7230463
+ 0.55636907
+```
+
+However, the Random.jl methods can also be used by providing the appropriate `RNG` either
+from `MPS.default_rng()` or `MPS.RNG()` to the standard `Random.rand[n][!]` functions:
+
+
+```julia-repl
+julia> using Random
+
+julia> rng = MPS.RNG();
+
+julia> Random.rand(rng, 2)
+2-element MtlVector{Float32, Metal.PrivateStorage}:
+ 0.8941469
+ 0.67628527
+```
+
+Seeding is done by calling `Metal.seed!` for the global RNG, or `Random.seed!` when working
+with an explicit `RNG` object.
 
 
 ## Other improvements since the last blog post