14.5: Sorting Serieses
- Page ID
- 21262
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)Sorting is slightly more complex than for arrays, since there are two things we might want to sort by: the Series’ index, or the values themselves. Correspondingly, there are two methods: .sort_index() and .sort_values():
Code \(\PageIndex{1}\) (Python):
print(anti_vamps.sort_index())
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| Rubert 150
| Willow 200
| Xander 72
| dtype: int64
Code \(\PageIndex{2}\) (Python):
print(anti_vamps.sort_values())
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| dtype: int64
Like NumPy’s np.sort() function (but unlike its .sort() method; refer back to Section 9.5), neither of these methods actually sort the Series in place; instead, they return sorted copies. However, they can be made to work in place, by including “inplace=True” as an argument:
Code \(\PageIndex{3}\) (Python):
heroes_dumb_to_smart = anti_vamps.sort_values()
print(heroes_dumb_to_smart)
| Xander 72
| Buffy 120
| Rubert 150
| Willow 200
| dtype: int64
Code \(\PageIndex{4}\) (Python):
print(anti_vamps)
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| Xander 72
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| Rubert 150
| dtype: int64
Code \(\PageIndex{5}\) (Python):
anti_vamps.sort_values(inplace=True)
print(anti_vamps)
| Xander 72
| Buffy 120
| Rubert 150
| Willow 200
| dtype: int64
Another useful feature of both .sort_X methods is the ability to reverse sort. By adding “ascending=False” as an argument (with or without also including the “inplace=True” argument; they are combinable with a comma) you produce the reverse order:
Code \(\PageIndex{6}\) (Python):
heroes_smart_to_dumb = anti_vamps.sort_values(ascending=False)
print(heroes_smart_to_dumb)
| Willow 200
| Rubert 150
| Buffy 120
| Xander 72
| dtype: int64
Code \(\PageIndex{7}\) (Python):
anti_vamps.sort_index(inplace=True, ascending=False)
print(anti_vamps)
| Xander 72
| Willow 200
| Rubert 150
| Buffy 120
| dtype: int64