assigning an array dynamically

Programming Questions

ventoline

assigning an array dynamically

in Programming Questions • 2 years ago

Sorry if it is elsewhere in the forum, I am new to processing, and this is a very basic problem:
Do i need to assign the dimension of an array when i create it? Can they grow dynamically, if so, what is the syntax?

so far i have

point3d[] pointHolder = new point3d[(w/skip)*(h/skip)];
pointHolder[x*y]= new point3d(x,y,z);

could i do

point3d[] pointHolder;
pointHolder[,push(new point3d(x,y,z));

Replies(5)

tfguy44

Re: assigning an array dynamically

2 years ago

http://processing.org/reference/append_.html

It does a better job explaining it than I could...

PhiLho

Re: assigning an array dynamically

2 years ago

For dynamically growing arrays, you should use ArrayList whose usage is close of what you describe.

ventoline

Re: assigning an array dynamically

2 years ago

Thank you, which is faster?

thomas.di..

Re: assigning an array dynamically

2 years ago

append() is the slowest solution you can choose, since everytime you call it, it allocates a new array (1 bigger than the old one) and copies all the values from the old one to the new one (inclusive the new value).

ArrayList does basically the same (handles an array internally), except the the allocation of the new array happens in blocks (buffered allocation) so, not everytime you append/add a new values to the list, a new array is created, and all the values are copied.

theres one processing function, that works similar, which is expand()