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John-C-Maxwell Attitude Book: The Winning Attitude - Free -. Attitude Books - Kindle edition by John Maxwell. Download it once and read it on your Kindle device, PC, phones or tablets. Use features like bookmarks, note taking and highlighting while reading The Winning Attitude. The Winning Attitude Book -- Pdf Free Download -- DPDFQ: I want a general matrix class to be used for multiple linear algebra classes My goal is to have a matrix class of variables with no limitation as to dimensions. I would like this class to be used for a bunch of classes that I am teaching where students are using the class to do linear algebra and will also learn something about coding. It would not only be used for a standard matrix class but also for a vector class and possibly others. The general idea is to have an interface that defines matrix dimensions and matrix operations and then each class that wishes to work with matrices implements that interface. This all seems like a simple idea but I am having some trouble implementing it. I've looked at libMatrix which seems to be a good way to go but the problem is that it has a very large matrix class with a lot of methods that is only compatible for two dimensional matrices. Another idea is to create an abstract class where each class implements a method that does the operations that we want and then have a matrix class that implements the abstract class methods and uses what I already have in libMatrix as a base class. I am a bit stuck as to which direction I should go. Do you have any suggestions? A: Have you looked at the Matrix template in C++? It looks like what you're after. Q: Getting a bunch of selectmenu items from a dropdown menu I have a search bar which allows me to filter my data. Currently, there is only one option. In the future, I will add a few more options. I would like to have multiple select menus to choose from. Is this possible? If it is, how do I get the dropdown options from my code? I'm using Rails 4. Thank you! A: The documentation for select_tag states this (emphasis mine): Any attributes will be associated with the new generated element.