AroundReplace

AroundReplace[expr,{s1Around[x1,δ1],s2Around[x2,δ2],}]

propagates uncertainty in expr by replacing all occurrences of si by Around[xi,δi].

AroundReplace[expr,rules,n]

propagates uncertainty in expr using a series expansion to order n.

Details

  • In AroundReplace[expr,{s1->Around[xi,],}], each occurrence of a given si in expr is assumed to represent the same value, but different replacements Around[xi,] are assumed to be uncorrelated.
  • In AroundReplace[expr,rules], rules can contain scalar rules of the form sAround[] for an uncorrelated variable s, or vector rules of the form {s,r,}VectorAround[] for correlated variables s,r,.
  • In AroundReplace[f[s,r],rules], uncertainty propagation is based on the formula
  • δf =

  • In AroundReplace[f[s,r],rules,n], uncertainty propagation involves derivatives up to order n.
  • For n=1, the result of AroundReplace[f[s],sAround[x,δ],n] is centered at f[x], but for higher n orders the central value may depend on δ as well.

Examples

open all close all

Basic Examples  (2)

Perform an operation with Around objects:

In[1]:=
Click for copyable input
Out[1]=

Converting x into two uncorrelated variables makes the result have smaller uncertainty:

In[2]:=
Click for copyable input
Out[2]=

Specify an intermediate level of correlation with VectorAround:

In[3]:=
Click for copyable input
Out[3]=

By default, uncertainty propagation uses first-order expansions:

In[1]:=
Click for copyable input
Out[1]=

Use a higher-order expansion to obtain better results:

In[2]:=
Click for copyable input
Out[2]=

Properties & Relations  (1)

Introduced in 2019
(12.0)