Let std work on a list of floats

[slel]

Initial report by Ingo Dahn at:

• https://groups.google.com/d/topic/cocalc/rblsUHwBXQc/discussion

Minimal example:

sage: version()
'SageMath version 9.0, Release Date: 2020-01-01'
sage: sage: std([float(3.2), float(3.4)])
Traceback (most recent call last)
...
AttributeError: 'float' object has no attribute 'sqrt'

Fix this by changing the function std(v, bias) at line 219 of
src/sage/stats/basic_stats.py:

-    return variance(v, bias=bias).sqrt()
+    try:
+        return variance(v, bias=bias).sqrt()
+     except AttributeError:
+        from sage.functions.other import sqrt
+        return sqrt(variance(v, bias=bias))

It turns out this was already fixed at #29184, merged in Sage 9.1.beta5.

CC: @fchapoton @slel

Component: statistics

Keywords: float, std, sqrt

Issue created by migration from https://trac.sagemath.org/ticket/29232

[fchapoton]

comment:2

what about #29184 ?

[slel]

comment:3

Sorry, missed that. Please close as duplicate.