How to Define a Default Input Argument for a Function?

2017 3 1
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更新时间：2017 3 1
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How to define a default input argument for a function? I want to set a default input argument which will be replaced later by new values entered by user. How?

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Adam
Adam 2017-3-1
编辑：Adam 2017-3-1

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function someFunc( someInput )
narginchk( 0, 1 )
if ~exist( 'someInput', 'var' )
someInput = 7;
end
...
end
Generally I add an extra line something like the following, but I'm fussy:
if exist( 'someInput', 'var' )
validateattributes( someInput, { 'double' }, { 'scalar', 'nonnegative' } )
else
someInput = 7;
end

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