Processing 1.0 - Processing Discourse - array length definition

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array length definition (Read 606 times)

array length definition
Dec 24^th, 2007, 6:00pm

hi,

i want to define an empty array but processing ask me array length.
i want to populate it at runtime because i need the legth value, then at startup i need an empty array with length 0. how can i do?

processing reference only shows this

int[] numbers = new int[3];
numbers[0] = 90;
numbers[1] = 150;
numbers[2] = 30;
int a = numbers[0] + numbers[1]; // Sets variable a to 240
int b = numbers[1] + numbers[2]; // Sets variable b to 180

int[] numbers = { 90, 150, 30 };
int a = numbers[0] + numbers[1]; // Sets variable a to 240
int b = numbers[1] + numbers[2]; // Sets variable b to 180

JohnG

Re: array length definition
Reply #1 - Dec 24^th, 2007, 11:13pm

If you're readign some value that you want to use as the array length you can do:

Code:

int[] items=new int[myReadInNumber];

If you don't know how long it needs to be and want to just keep adding stuff to it:

Code:

int[] items=new int[0];

if(something)
{
  items=append(items,newValue);
}
//...
items=append(items,273);

q Junior Member Offline Posts: 58	Re: array length definition Reply #2 - Dec 25^th, 2007, 10:53am thanks a lot, i will use append function but i don't find it into documentation also it seem a bad way to do this. why processing donsen't support array without dimension and why the doc is so poor?

JohnG Ex Member	Re: array length definition Reply #3 - Dec 25^th, 2007, 5:58pm See the "Array Functions" section on http://processing.org/reference/index.html for all the documentation. Processing is built on Java and in Java an array has to have a size. There are other things like ArrayLists in Java that don't need to have a size.

q Junior Member Offline Posts: 58	Re: array length definition Reply #4 - Dec 26^th, 2007, 10:42am ok, if is the only way i do it thanks a lot :]

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