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Correct random to pseudo-random. Add information.

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Alexander F Rødseth
2016-02-10 12:44:04 +01:00
parent 9a9773e049
commit f8416d5de0
1 changed files with 5 additions and 5 deletions
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10
go/not-so-random.md
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@@ -1,8 +1,8 @@
# Not So Random
Go's `rand` package makes it easy to generate all sorts of random numbers.
What they don't tell you though is that the default seed is `1`. So if you
write a program like so:
Go's `rand` package makes it easy to generate all sorts of pseudo-random numbers.
What they don't tell you though is that the default seed is `1`. They [do tell you that the numbers are pseud-random and that you need to use the Seed function to initialize the default source if different behavior is required for each run](https://golang.org/pkg/math/rand/), though. So if you write a program like so:
```go
package main
@@ -35,7 +35,7 @@ seed it yourself, perhaps with the current time, instead of `1`. Try adding
the following to the beginning of the `main` function:
```go
rand.Seed( time.Now().UTC().UnixNano())
rand.Seed(time.Now().UTC().UnixNano())
```
You'll also want to import the `time` package.
@@ -43,4 +43,4 @@ You'll also want to import the `time` package.
Things should *appear* to be a bit more random now.
source: [Jake Worth](https://twitter.com/jwworth) and
[Stackoverflow](http://stackoverflow.com/questions/12321133/golang-random-number-generator-how-to-seed-properly)
[Stackoverflow](http://stackoverflow.com/questions/12321133/golang-random-number-generator-how-to-seed-properly)