V2EX row-echelon

Row-echelon

释义 Definition

(线性代数)“行阶梯的;行阶梯形的”。通常指矩阵经过初等行变换后呈现的行阶梯形(row echelon form):非零行在零行之上,每一行的主元(leading entry)位置相对上一行向右移动,且主元下方元素为零。(也常与“简化行阶梯形”相对。)

发音 Pronunciation (IPA)

/ro ln/

例句 Examples

We wrote the matrix in row-echelon form to solve the system.
我们把矩阵化为行阶梯形来解这个方程组。

After several elimination steps, the coefficient matrix becomes row-echelon, revealing the rank and whether the system has free variables.
经过若干步消元后,系数矩阵变成行阶梯形,从而显示出矩阵的秩以及方程组是否存在自由变量。

词源 Etymology

“Row”意为“行”;“echelon”源自法语 échelon,本义与“梯级、阶梯”有关,后来引申为“呈阶梯式排列”。在矩阵语境中,“row-echelon”形象地描述各行主元位置像台阶一样逐行向右“上升”的结构。

相关词 Related Words

文学与著作中的用例 Notable Works

  • Linear Algebra and Its Applications(David C. Lay 等):在高斯消元章节中频繁使用“row echelon form”。
  • Introduction to Linear Algebra(Gilbert Strang):讲解消元法、主元与阶梯形矩阵结构时出现该术语。
  • Elementary Linear Algebra(Howard Anton):系统讨论行变换与(简化)行阶梯形在解线性方程组中的作用。
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