how to find a line which is perpendicular to a given line programmaticlly ???

**zlly20** · 05-08-25, 18:18

Say, I have a line A :

y = a * x + b

now I want to find another line which is perpendicular to A at point M [m, n] and M is on A:

y1 = a1 * x1 + b1

what is the simplest way to do it programmatically in c++???

**gamedragon** · 05-08-26, 09:36

a1=-1/a (a!=0)

**bookstack** · 05-08-27, 02:29

用lex && yacc 来分析：

y = a * x + b
var_0 = var_1 times var_2 plus var_3

得到syntax tree以后，遍历找相似的。

**gamedragon** · 05-08-27, 10:21

楼主问的是语法分析的问题么？难道我理解错了？
perpendicular不是垂直的意思么？

05-08-25, 18:18	第 1 帖
zlly20 注册会员注册日期: Aug 2002 帖子: 533 精华: 2	标题: how to find a line which is perpendicular to a given line programmaticlly ??? Say, I have a line A : y = a * x + b now I want to find another line which is perpendicular to A at point M [m, n] and M is on A: y1 = a1 * x1 + b1 what is the simplest way to do it programmatically in c++??? __________________ 淡泊以明志,宁静以致远

欢迎来到LinuxSir.Org!
您还未登录，请登录后查看论坛，或者点击论坛上方的注册链接注册新账号。

05-08-26, 09:36	第 2 帖
gamedragon 注册会员注册日期: Mar 2004 帖子: 559 精华: 0	a1=-1/a (a!=0)

05-08-27, 02:29	第 3 帖
bookstack 注册会员注册日期: Jan 2004 帖子: 714 精华: 3	用lex && yacc 来分析： y = a * x + b var_0 = var_1 times var_2 plus var_3 得到syntax tree以后，遍历找相似的。

05-08-27, 10:21	第 4 帖
gamedragon 注册会员注册日期: Mar 2004 帖子: 559 精华: 0	楼主问的是语法分析的问题么？难道我理解错了？ perpendicular不是垂直的意思么？