CODEWITHSUNDEEP
phprandom
Rachelle
Rachelle

Reputation: 267

Generating Random Number

Does anyone know how to generate random numbers from -1 to 1. Or is it even possible to do? I've researched already and i only get answers for generating random numbers from 0 to N. By the way, i'm using PHP.

Please help! Thanks in advance to those who'll answer!

Upvotes: 0

Views: 144

Answers (3)

Baba
Baba

Reputation: 95101

You can try this for integers:

$array = range(- 1, 1, 1);
echo $array[mt_rand(0, count($array) - 1)]; // example 0

Or this for floats with precision declared in the third parameter of range():

$array = range(- 1, 1, 0.1);
echo $array[mt_rand(0, count($array) - 1)]; // example -0.9

Upvotes: 1

Mert Akcakaya
Mert Akcakaya

Reputation: 3129

Generate random number between 0 and 2, then subtract 1 from generated number.

Upvotes: 3

Patashu
Patashu

Reputation: 21773

If you have a random function that generates numbers from 0.0 to 1.0, multiply the result by two and subtract 1.

Upvotes: 4

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