<< memory

Memory manager functions

varislock >>

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persistent

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Persistent variable.

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Syntax

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persistent variable_name

persistent('variable_name')

persistent variable_name1, ..., variable_nameN

Input argument

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variable_name

a string: variable name.

Description

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persistent defines a variable defined by his name variable_name as persistent in a function.

Before to use a persistent variable, it is necessary to initializ value.

Examples

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function to define:

function r = test_persistent_function()
 persistent calls;
 if isempty(calls)
    calls = 0;
 end 
 disp(['nb calls to test_persistent_function: ', int2str(calls)]);
 r= calls;
 calls = calls + 1;
end

calls test_persistent_function

for i = 1:30
  r = test_persistent_function();
end

See also

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clear, who, global.

History

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Version	Description
1.0.0	initial version

Author

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Allan CORNET