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Add namespace, class, or functions to current import list



import Namespace.ClassName adds the class name to the current import list. To refer to a class without specifying the entire namespace, use the import function in your code.

The import list scope is defined as follows:

  • Functions, including nested and local functions — The scope is the entirety of the function. This includes code that precedes import.

    The import list of a function is persistent across calls to that function and is cleared only when the function is cleared. For more information, see the clear function. Do not call clear import within a function or a script.

    Scripts — The scope of a script is the entire script body. This includes code that precedes import. The imports in a script are available only in the script body and are not available in the scopes which call the script. For example, executing a script containing imports at the command prompt does not make the imports available in the command window.

  • Base workspace — The scope is code executed at the command prompt. To clear the base import list, type clear import at the MATLAB® command prompt.


import Namespace.FunctionName adds the specified namespace-based function. Use this syntax to shorten the name of a specific function in a namespace without importing every function in the namespace, which might cause unexpected name conflicts.


import Namespace.ClassName.staticMethodName adds the specified static method. Use this syntax to shorten the name of a specific static method.


import Namespace.* adds the contents of the specified namespace identifier. Namespace must be followed by .*.

Avoid using this syntax, as importing the contents of namespaces brings an unspecified set of names into the local scope, which might conflict with names in the MATLAB workspace. One possible use for this syntax is to import a partial namespace. Then when you call a function, you use a shorter namespace name which does not conflict with simple function names.


import displays the current import list in the scope.

L = import returns the current import list.


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import java.util.Currency java.lang.String

Create a java.lang.String object. There is no need to type the namespace identifier, java.lang.

s = String('hello')
s =


List the Currency class methods, without typing the namespace identifier.

methods Currency
Methods for class java.util.Currency:

equals                    getAvailableCurrencies    getClass                  getCurrencyCode           getDefaultFractionDigits  getDisplayName            getInstance               getNumericCode            getSymbol                 hashCode                  notify                    notifyAll                 toString                  wait                      

Use partial namespace identifiers on your import list to simplify calls to namespace functions and avoid conflicts with the MATLAB close function.


Display the full path to the example file sd.hdf on your system using the shortened namespace identifiers sd.

sdID = sd.start('sd.hdf');
filename = sd.getFilename(sdID)
filename =


Call the close function with the sd namespace identifiers.


There is no name conflict with the MATLAB close function when you import the partial namespace identifiers.

which close

If you use the* syntax to import the entire namespace identifiers, when you call close, MATLAB always chooses the namespace function. You cannot use close to remove a figure.

Import the Namespace function, readChunk in a function, myfunc. You can call the function using the simple name readChunk, but only within the scope of myfunc.

function data = myfunc(ID,n,m)
data = readChunk(ID,[n m]);

Import the matlab.metadata.Class.fromName static method in a function, myFunc. You can call the static method using the simple name fromName, but only within the scope of myFunc.

function metaClsObj = myFunc(ClassName)
    import matlab.metadata.Class.fromName
    metaClsObj = fromName(ClassName);

Open the sd.hdf example file and access the temperature data set.

sdID = sd.start('sd.hdf');
idx = sd.nameToIndex(sdID,'temperature');
sdsID =,idx);

Call the myfunc function from the previous example to read the data. myfunc must have its own import statement to use a shortened namespace identifier.

dataChunk = myfunc(sdsID,0,1);

Close the file.

ans = 


Input Arguments

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Namespace identifier, specified as a string or character vector.


Name of the class, specified as a string or character vector.

Example: Currency

Name of the namespace function, specified as a string or character vector.

Example: readChunk

Name of the static method, specified as a string or character vector.

Example: fromName

Data Types: char | string

Output Arguments

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Import list, returned as a cell array of character vectors.


  • import cannot load a Java® JAR namespace created by the MATLAB Compiler SDK™ product.

  • Do not use import in conditional statements inside a function. MATLAB preprocesses the import statement before evaluating the variables in the conditional statements.

Version History

Introduced before R2006a

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