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3.1 Spaces of Vectors Subspaces 是一个需要满足以下两个条件的重要概念。 （1） v+w\bm v+\bm wv+w is in the subspace （2）cvc\bm vcv is in the subspace v\bm vv, w\bm ww are vectors in the subspace. cccis any scalar. Example 1 对于vectors(x,y),若要求x≥0x \ge 0x≥0 同时y≥0y \ge 0y≥0，则这个四分之一

2.1 Vectors and Linear Equations The central problem of linear algebra is to solve a system of linear equations which means that the unknown are only multiplied by numbers–we never see xxx times yyy. The column picture of Ax=b:Ax = b:Ax=b: a combination

今天开始重新学习线性代数，从数据分析、机器学习的角度，争取今后可以看懂专业论文。其实，大学时光是学过的，但加上遗忘和本身是从市政工程的角度学的，目前只记得一些基本的操作，更深的就忘记了。 Introduction to Linear Algebar (Fifth edition) writtened by Dr. Gilber Strang. The really impressive feature of linear algebra is how smoothly is takes that step