Remove 'warning off'

[RomeshA]

In general, the pattern

warning off
stuff()
warning on    

this can lead to unpredictable behaviour (specifically, other unrelated warnings unexpectedly not being raised) if an error occurs while running stuff(). It would be better to check explicitly for the warning conditions. For example, instead of

warning off
mkdir(dirname)
warning on

it should read

if ~exist(dirname,'dir')
    mkdir(dirname)
end

This needs to be replaced in a number of places. As a somewhat weaker alternative, in some places specific warnings could be disabled instead of all warnings e.g. suppressing divide by zero warnings