CODEWITHSUNDEEP
matlabglobal
Metiu
Metiu

Reputation: 3

GLOBAL vs global keyword

I'm studying a MATLAB code in which I found this:

GLOBAL = eye(4,4);

what is GLOBAL? Is it a global variable? Documentation says that global variables are declared in this way:

global x1 = 4;

What are the differences between GLOBAL and global?

Upvotes: 0

Views: 70

Answers (2)

Matthias W.
Matthias W.

Reputation: 1077

I wrote a little script which highlights the difference:

clear all;
global x1;
x1 = 4;
GLOBAL = eye(4,4);
whos

As you can see in the workspace x1 is a global variable, whereas GLOBAL is not:

 Name        Size            Bytes  Class     Attributes

  GLOBAL      4x4               128  double              
  x1          1x1                 8  double    global

Edit: you could even declare GLOBAL globally: global GLOBAL which then leads to:

  Name        Size            Bytes  Class     Attributes

  GLOBAL      4x4               128  double    global    
  x1          1x1                 8  double    global

Upvotes: 2

Adriaan
Adriaan

Reputation: 18177

GLOBAL = eye(4,4); indeed makes GLOBAL a variable. This is not too bad, as MATLAB is case sensitive, though not very clear of course. The documented version you found is global in lower case. I'd suggest not naming variables the same as built-in functions, e.g. if you calculate a sum don't call it sum but Summed or something; don't call an average mean, but Avg etc.

Upvotes: 3

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