RomanNumeral

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`RomanNumeral`

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RomanNumeral[n]

gives a string corresponding to the Roman numeral form of the integer n.

Details

Roman numerals are formed using combinations of the letters I, V, X, L, C, D, and M.
The number 0 is represented as the numeral "N", the initial letter of the word nulla.
RomanNumeral[n] for a negative integer n produces the result corresponding to the absolute value of n.
For numbers above 4999, specifications for overbars are inserted into the string given as the result.

Examples

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

Roman numeral corresponding to the number 2023:

In[1]:=1

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https://wolfram.com/xid/0d6hcbtn90-pibrcq

Out[1]=1

Convert a list of integers into their Roman numerals:

In[1]:=1

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https://wolfram.com/xid/0d6hcbtn90-xbd9wj

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0d6hcbtn90-gy0r30

Out[2]=2

Scope (5)Survey of the scope of standard use cases

Roman numerals are constructed using the letters I, V, X, L, C, D, and M:

In[1]:=1

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https://wolfram.com/xid/0d6hcbtn90-f9pa6o

Out[1]=1

The integer 0 is represented using the numeral "N". No other Roman numeral contains the letter N:

In[1]:=1

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https://wolfram.com/xid/0d6hcbtn90-6dcb8k

Out[1]=1

Beginning with 5000, integers have an overbar in their representation:

In[1]:=1

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https://wolfram.com/xid/0d6hcbtn90-z04wc

Out[1]=1

Each additional factor of 1000 adds another overbar:

In[2]:=2

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https://wolfram.com/xid/0d6hcbtn90-eiziys

Out[2]=2

Signs are ignored:

In[1]:=1

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https://wolfram.com/xid/0d6hcbtn90-ewsjib

Out[1]=1

RomanNumeral threads automatically over lists of integers:

In[1]:=1

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https://wolfram.com/xid/0d6hcbtn90-hiua1p

Out[1]=1

Properties & Relations (4)Properties of the function, and connections to other functions

RomanNumeral returns strings in uppercase. Use ToLowerCase to convert to lowercase:

In[1]:=1

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https://wolfram.com/xid/0d6hcbtn90-6ndjjp

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0d6hcbtn90-rd1m6n

Out[2]=2

These are the possible repetitions and their counts in the first 4999 Roman numerals:

In[1]:=1

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https://wolfram.com/xid/0d6hcbtn90-0dkkts

Out[1]=1

FromRomanNumeral converts a Roman numeral into its integer decimal form:

In[1]:=1

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https://wolfram.com/xid/0d6hcbtn90-4zcdqv

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0d6hcbtn90-p95dar

Out[2]=2

RomanNumeral[n] is equivalent to IntegerString[n,"Roman"]:

In[1]:=1

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https://wolfram.com/xid/0d6hcbtn90-55cuha

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0d6hcbtn90-y5hhpy

Out[2]=2

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