javascript - Default input number value -

i'm new angularjs , i've created simple input box want default value.

here's input:

<input id="fieldwidth" min="10" type="number"  value="10" ng-model="set.width"> 

however, value doesn't show default.

when try set though scope in controller

$scope.set.width = "10"; 

it says

"cannot set property 'width' of undefined" 

what missing?

if haven't already... should set $scope.set before trying set it's child:

$scope.set = {width:10}; 

or

$scope.set = {}; $scope.set.width = 10; 

or can without set object if don't have other values associating it.

$scope.width = 10; 

<input id="fieldwidth" min="10" type="number" ng-model="width">