On global variables.

Good morning Matlab users.

I would really appreciate some help on the following issue. I am working with a script file which calls a first function file which in turn calls a second function file. I have declared some variables as global. Both function files recognize all but one of these variables as global (blue color). However, the script file does not seem to recognize one particular variable as a global one. Please let me show you the first line of the code (which appears in the three files aforementioned).

global Numero C_C C_NC Saving_C Saving_NC N g_a I_Y n_bar S_bar n_mean r w ...

In particular, the variable causing the problem is the fourth one, "Saving_C". Does anyone have any idea of what I am doing wrong? Thanks in advance for your cooperation.

Regards,

Cruz

University of the Basque Country

[John D'Errico]

Yet another reason why global variables are just obscenely bad programming style.

[Stephen23]

Globals come second on this list:

http://blogs.mathworks.com/videos/2010/03/08/top-10-matlab-code-practices-that-make-me-cry/

More discussion of why globals are terrible way to write code:

http://www.mathworks.com/matlabcentral/answers/51946-systematic-do-not-use-global-don-t-use-eval

http://matlab.wikia.com/wiki/FAQ#Are_global_variables_bad.3F

http://www.mathworks.com/matlabcentral/answers/14857-where-do-people-learn-bad-programming-habits-i-e-goto-global-and-eval

http://www.mathworks.com/matlabcentral/answers/19316-global-could-be-very-inefficient

The official MATLAB documentation says "Use global variables sparingly, if at all.", and shows better ways to pass variables between workspaces (pass them as arguments!):

http://www.mathworks.com/help/matlab/matlab_prog/share-data-between-workspaces.html

[Walter Roberson]

Does the same variable happen to occur as the name of a parameter to the function?