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MissingValuePattern
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MissingValuePattern

Updatedshow changeshide changes[Experimental]

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is an option for SynthesizeMissingValues and ToTabular to specify which data elements are considered missing.

Details

  • MissingValuePattern is typically used to identify missing values. For instance, it is common to have some proxy value be interpreted as missing.
  • Possible settings include:
  • Automaticautomatically determine missing values
    pattuse patt for each element to determine missing values
  • The patti can also be Automatic, in which case, missing for that column is automatically recognized.
  • By default, Missing[…] and Indeterminate values are considered missing.

Examples

open allclose all

Basic Examples  (2)Summary of the most common use cases

Specify that missing values are indicated by the value "99":

In[1]:=1
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https://wolfram.com/xid/0bh0wz164xzetu-8x5kky
In[2]:=2
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https://wolfram.com/xid/0bh0wz164xzetu-tqp0bi
Out[2]=2

Specify that the missing values are integers:

In[1]:=1
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https://wolfram.com/xid/0bh0wz164xzetu-wuutgv
In[2]:=2
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https://wolfram.com/xid/0bh0wz164xzetu-3vqe10
Out[2]=2
In[3]:=3
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https://wolfram.com/xid/0bh0wz164xzetu-wxtvf2
Out[3]=3

Scope  (3)Survey of the scope of standard use cases

Specify missing values with Condition:

In[1]:=1
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https://wolfram.com/xid/0bh0wz164xzetu-s7wk2q
In[2]:=2
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https://wolfram.com/xid/0bh0wz164xzetu-jzetlh
Out[2]=2
In[3]:=3
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https://wolfram.com/xid/0bh0wz164xzetu-dhfw6z
Out[3]=3

Train a distribution on a two-dimensional dataset:

In[1]:=1
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https://wolfram.com/xid/0bh0wz164xzetu-9eb8g
Out[1]=1

Specify that missing values are indicated by the value "7":

In[2]:=2
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https://wolfram.com/xid/0bh0wz164xzetu-u4nvqc
Out[2]=2

By default, Tabular only interprets explicit Missing[…] expressions as missing values:

In[1]:=1
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https://wolfram.com/xid/0bh0wz164xzetu-fgylne
Out[1]=1

Use ToTabular to specify a pattern for the entries that should be additionally interpreted as missing values:

In[2]:=2
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https://wolfram.com/xid/0bh0wz164xzetu-9qcy88
Out[2]=2

Specify multiple MissingValuePattern values:

In[40]:=40
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https://wolfram.com/xid/0bh0wz164xzetu-t8q1ek
Out[40]=40
In[43]:=43
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https://wolfram.com/xid/0bh0wz164xzetu-nxu3cd
Out[43]=43

Applications  (1)Sample problems that can be solved with this function

Obtain a dataset of images:

In[1]:=1
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https://wolfram.com/xid/0bh0wz164xzetu-hamat6
In[2]:=2
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https://wolfram.com/xid/0bh0wz164xzetu-qzzjzs
Out[2]=2

Train a distribution on the images:

In[3]:=3
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https://wolfram.com/xid/0bh0wz164xzetu-mwubth
Out[3]=3

Use MissingValuePattern to replace the pixel values that should be considered missing with the samples generated from the learned distribution:

In[4]:=4
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https://wolfram.com/xid/0bh0wz164xzetu-xk37in
In[5]:=5
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https://wolfram.com/xid/0bh0wz164xzetu-o19bnp
Out[5]=5
Wolfram Research (2019), MissingValuePattern, Wolfram Language function, https://reference.wolfram.com/language/ref/MissingValuePattern.html (updated 2025).
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Wolfram Research (2019), MissingValuePattern, Wolfram Language function, https://reference.wolfram.com/language/ref/MissingValuePattern.html (updated 2025).

Text

Wolfram Research (2019), MissingValuePattern, Wolfram Language function, https://reference.wolfram.com/language/ref/MissingValuePattern.html (updated 2025).

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Wolfram Research (2019), MissingValuePattern, Wolfram Language function, https://reference.wolfram.com/language/ref/MissingValuePattern.html (updated 2025).

CMS

Wolfram Language. 2019. "MissingValuePattern." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2025. https://reference.wolfram.com/language/ref/MissingValuePattern.html.

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Wolfram Language. 2019. "MissingValuePattern." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2025. https://reference.wolfram.com/language/ref/MissingValuePattern.html.

APA

Wolfram Language. (2019). MissingValuePattern. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/MissingValuePattern.html

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Wolfram Language. (2019). MissingValuePattern. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/MissingValuePattern.html

BibTeX

@misc{reference.wolfram_2025_missingvaluepattern, author="Wolfram Research", title="{MissingValuePattern}", year="2025", howpublished="\url{https://reference.wolfram.com/language/ref/MissingValuePattern.html}", note=[Accessed: 08-July-2025 ]}

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@misc{reference.wolfram_2025_missingvaluepattern, author="Wolfram Research", title="{MissingValuePattern}", year="2025", howpublished="\url{https://reference.wolfram.com/language/ref/MissingValuePattern.html}", note=[Accessed: 08-July-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_missingvaluepattern, organization={Wolfram Research}, title={MissingValuePattern}, year={2025}, url={https://reference.wolfram.com/language/ref/MissingValuePattern.html}, note=[Accessed: 08-July-2025 ]}

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@online{reference.wolfram_2025_missingvaluepattern, organization={Wolfram Research}, title={MissingValuePattern}, year={2025}, url={https://reference.wolfram.com/language/ref/MissingValuePattern.html}, note=[Accessed: 08-July-2025 ]}