MATLAB Function Reference

isglobal

Determine if input is global variable

Note    Support for the isglobal function will be removed in a future release of MATLAB. See Remarks below.

Syntax

• tf = isglobal(A)
  

Description

tf = isglobal(A) returns logical 1 (true) if A has been declared to be a global variable in the context from which isglobal is called, and logical 0 (false) otherwise.

Remarks

isglobal is most commonly used in conjunction with conditional global declaration. An alternate approach is to use a pair of variables, one local and one declared global.

Instead of using

• if condition
     global x
  end
  
  x = some_value
  
  if isglobal(x)
     do_something
  end
  

You can use

• global gx
  if condition
     gx = some_value
  else
     x = some_value
  end
  
  if condition
     do_something
  end
  

If no other workaround is possible, you can replace the command

• isglobal(variable)
  

with

• ~isempty(whos('global','variable'))
  

See Also

global, isvarname, isa, is*

isfloat

ishandle

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