The problem A+B is probably the easiest problem, however, the maxim number C/C++ can calculate is between -9223372036854775808~9223372036854775807. The bigger number can’t be calculate unless you use Python or Java. So I’m going to introduce a way to calculate the big number of A+B.

Operators

1. combination:

   $$\vec{v_1} , \vec{v_2}, \vec{v_3} \cdots \vec{v_n} \in \mathbb{R}^n \\ c_1 \vec{v_1} + c_2 \vec{v_2} + \cdots + c_n \vec{v_n} \space [ (c_1 \rightarrow c_n) \in \mathbb{R}]$$

The code of the bouncing all and more projects.

I’ve learnt Processing JavaScript a little and have some complete projects. They are very simple but I think they are not ugly.

In order to post my note of linear algebra, I need to know how to put matrix using LaTex. The followings are the usage.

1. intro:

   $$\left[\begin{matrix} x \\ x \\ x \end{matrix} \right]\to element \space amount (n) = n \space dimension$$

​ $\mathbb{R}^n$ (e.g. n = 3 3 Dimension)

To describe supervised learning,we establish notation for future use.

$x^i$ denote the input variables also called input features

$y^i$ denote the output variables also called target variables that we are trying to predict.

A pair ($x^i, y^i$) is called a training set.

A quick way to check whether the character a is a function is to use the function isalpha(a). If is lower case, return 1; If is upper case, return 2; If is not an alphabet, return 0;

The header file of it is < iostream > or < cctype >.