Tips on Using Global Variables

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(26) Tips on Using Global Variables

Tips on Using Global Variables

Use unique descriptive names for global variables

all functions use the same global workspace

whos global

shows the contents of the global workspace

clear global

clears the global workspace

isglobal(variable_name)

test to see if a variable is global

Example:
function tic
%    TIC Start a stopwatch timer.
%        TIC; any stuff; TOC
%    prints the time required.
%    See also: TOC, CLOCK.
global TICTOC
TICTOC = clock;

function t = toc
%    TOC Read the stopwatch timer.
%    TOC prints the elapsed time since TIC was used.
%    t = TOC; saves elapsed time in t, does not print.
%    See also: TIC, ETIME.
global TICTOC
if nargout < 1
    elapsed_time = etime(clock, TICTOC)
else
    t = etime(clock, TICTOC);
end

Tips_Global_Variables.src last modified Oct 17, 2007

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