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I am having problems in understanding libraries' functions and tools. I tried it by reading the examples given in the processing but that didn't solve my purpose. So, please suggest me any online resource through which I can grasp the knowledge of how to use libraries in the sketches.
Answers
To understand libraries, you should understand class ( or object-oriented programming_ first. u may look at this tutorial: processing.org/tutorials/objects/
I deleted the "answer" you made to a random, unrelated thread, with the same content than above. I suppose it was an error, but I suggest to avoid this in the future. :-) Thanks.
Your message is quite generic. Do you have trouble to install the libraries? You don't understand how to use them in code? Do you have a specific library in mind? Have you tried to look at the examples coming with the library?