"Julia" (External Evaluation System)

Details

Julia Version 0.7 and higher is supported. For ExternalFunction support, Julia 1.2 or higher is required.
To configure Julia for use in the Wolfram Language, follow the instructions from the Configure Julia for ExternalEvaluate workflow.

ExternalEvaluate["Julia",code] executes the code string in a Julia REPL and returns the results as a Wolfram Language expression.
ExternalEvaluate["Julia""String",code] executes the code string in a Julia REPL and returns the output as a Wolfram Language string.

Bool	True \| False	Boolean True/False values
Int8, Int16, Int32, etc.	Integer	integer
Float16, Float32, etc.	Real	real number
Complex{Float16}, Complex{Float32}, etc.	Complex	complex number (returning from Julia only)
String	String	string of characters
Array	List	list of objects
Dict	Association	associative array
Set	List	unordered set without duplicates
Tuple	List	fixed-length container
Date, DateTime		dates, date intervals
NaN	Indeterminate	not-a-number
nothing	Null	no return value

String templates (<*…*>) can be used to evaluate and insert Wolfram Language expressions into the Julia code string.

open allclose all

Evaluate 2+2 in Julia and return the result:

Arrays are returned as lists:

Type > and select Julia from the drop-down menu to get a code cell that uses ExternalEvaluate to evaluate:

map(sqrt, 1:1:10)

Dates are returned from Julia as DateObject expressions:

Start a session:

Concatenate strings in Julia and return the result:

Dictionaries in Julia are returned as associations:

Close the session:

Start a session:

Define a Wolfram Language function that calls a Julia function:

Close the session:

A NumericArray is sent to Julia as an array with the same element type:

This shows the native Julia type for the incoming array:

Close the session:

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