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How do I set default values for functions parameters in MATLAB?

There isn’t a direct way to do this like you’ve attempted. The usual approach is to use “varargs” and check against the number of arguments. Something like: function f(arg1, arg2, arg3) if nargin < 3 arg3 = ‘some default’ end end There are a few fancier things you can do with isempty, etc., and you … Read more

PHP Default Function Parameter values, how to ‘pass default value’ for ‘not last’ parameters?

PHP doesn’t support what you’re trying to do. The usual solution to this problem is to pass an array of arguments: function funcName($params = array()) { $defaults = array( // the defaults will be overidden if set in $params ‘value1’ => ‘1’, ‘value2’ => ‘2’, ); $params = array_merge($defaults, $params); echo $params[‘value1’] . ‘, ‘ … Read more

Symfony2 Setting a default choice field selection

You can define the default value from the ‘data’ attribute. This is part of the Abstract “field” type (http://symfony.com/doc/2.0/reference/forms/types/field.html) $form = $this->createFormBuilder() ->add(‘status’, ‘choice’, array( ‘choices’ => array( 0 => ‘Published’, 1 => ‘Draft’ ), ‘data’ => 1 )) ->getForm(); In this example, ‘Draft’ would be set as the default selected value.

How to use a member variable as a default argument in C++?

Default argument expressions for a member function can only depend on things that are in class or global scope. The default argument also has to be specified in the method’s declaration (i.e. in the header file). To get around this, you need 2 overloads of your MoveTo method. One that takes 1 argument, and another … Read more

Using Default Arguments in a Function

I would propose changing the function declaration as follows so you can do what you want: function foo($blah, $x = null, $y = null) { if (null === $x) { $x = “some value”; } if (null === $y) { $y = “some other value”; } code here! } This way, you can make a … Read more

What does “default” mean after a class’ function declaration?

It’s a new C++11 feature. It means that you want to use the compiler-generated version of that function, so you don’t need to specify a body. You can also use = delete to specify that you don’t want the compiler to generate that function automatically. With the introduction of move constructors and move assignment operators, … Read more

Default action to execute when pressing enter in a form

This is not specific to JSF. This is specific to HTML. The HTML5 forms specification section 4.10.22.2 basically specifies that the first occuring <input type=”submit”> element in the “tree order” in same <form> as the current input element in the HTML DOM tree will be invoked on enter press. There are basically two workarounds: Use … Read more

Should switch statements always contain a default clause?

Switch cases should almost always have a default case. Reasons to use a default 1.To ‘catch’ an unexpected value switch(type) { case 1: //something case 2: //something else default: // unknown type! based on the language, // there should probably be some error-handling // here, maybe an exception } 2. To handle ‘default’ actions, where … Read more

How to set a Django model field’s default value to a function call / callable (e.g., a date relative to the time of model object creation)

The question is misguided. When creating a model field in Django, you are not defining a function, so function default values are irrelevant: from datetime import datetime, timedelta class MyModel(models.Model): # default to 1 day from now my_date = models.DateTimeField(default=datetime.now() + timedelta(days=1)) This last line is not defining a function; it is invoking a function … Read more

Browsers’ default CSS stylesheets

Not tabular, but the source CSS may be helpful if you’re looking for something specific: Firefox default HTML stylesheet WebKit default HTML stylesheet You’re on your own with IE and Opera though.