persistent

Persistent variable.

📝 Syntax

• persistent variable_name

• persistent('variable_name')

• persistent variable_name1, ..., variable_nameN

📥 Input argument

• variable_name - a string: variable name.

📄 Description

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

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

clear, who, global.

🕔 History

Version	📄 Description
1.0.0	initial version