Generate random floating value

Question

I need to generate random floating numbers between 0 and 1 in the field of attribute table for ArcGIS 10.3 version.

pro.arcgis.com/en/pro-app/tool-reference/data-management/… — Paulo Raposo, Commented Jul 2, 2016 at 7:44
@PauloRaposo That documentation is for ArcGIS Pro but the equivalent for ArcGIS Desktop is at desktop.arcgis.com/en/arcmap/10.3/tools/data-management-toolbox/… — PolyGeo, Commented Jul 2, 2016 at 7:56
@FelixIP I'm not sure how random that actually is - When I use rnd(), even on different feature classes, different field types, the values are always the same — Midavalo, Commented Jul 2, 2016 at 20:20

Midavalo · Accepted Answer · 2016-07-02 20:23:41Z

19

In the pre-logic script code box:

import random
def randnum():
    return random.random()

Result in a new float field:

answered Jul 2, 2016 at 7:35

Midavalo♦

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+1 Answers that show examples and screenshots are especially helpful.
– Aaron ♦
Commented Jul 3, 2016 at 2:37
2

Just importing random in Pre-Logic Script and adding random.random() to the bottom input box yields the same result. One warning though, the field calculated should be a float or double type.
– fatih_dur
Commented Oct 12, 2017 at 5:09

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FelixIP · Accepted Answer · 2016-07-05 03:58:46Z

3

You can vary parameter in expression below, depending on what distribution is required:

def aRand():
 return arcgis.rand("Normal 2 2")

---------------------------------------

aRand()

answered Jul 5, 2016 at 3:58

FelixIP

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