怎样查看真实坐标(如:5.345349875930000000)???

004

;;怎样查看到实体定位点所有小数位数的真实坐标(如:5.3453498759387598375384500000000),
;;而不是在模型空间用id查出的4位小数,也不是在vlisp编辑器中在控制台中输出的带e的科学记数坐标.

ll_j

acad不是专业的数学分析软件，浮点运算精度也只是十六位，所以无法得到更无法显示超过这样精度的数。使用rtos可以得到总长16位的数值（包括整数位）。

004

(rtos 0.1234567890123456789 2 14)
"0.12345678901235"
(rtos 0.1234567890123456789 2 15)
"0.123456789012346"
(rtos 0.1234567890123456789 2 16)
"0.1234567890123457"
(rtos 0.1234567890123456789 2 17)
"0.1234567890123456"
(rtos 0.1234567890123456789 2 20)
"0.1234567890123456"

(rtos 123.1234567890123456789 2 10)
"123.1234567890"
(rtos 123.1234567890123456789 2 11)
"123.12345678901"
(rtos 123.1234567890123456789 2 12)
"123.123456789012"
(rtos 123.1234567890123456789 2 13)
"123.1234567890123"
(rtos 123.1234567890123456789 2 14)
"123.1234567890123"
(rtos 123.1234567890123456789 2 15)
"123.1234567890123"
(rtos 123.1234567890123456789 2 16)
"123.1234567890123"
(rtos 123.1234567890123456789 2 20)
"123.1234567890123"

(rtos 1234567890.1234567890123456789 2 4)
"1234567890.1235"
(rtos 1234567890.1234567890123456789 2 5)
"1234567890.12346"
(rtos 1234567890.1234567890123456789 2 6)
"1234567890.123457"
(rtos 1234567890.1234567890123456789 2 7)
"1234567890.123457"
(rtos 1234567890.1234567890123456789 2 10)
"1234567890.123457"

004

为何一个是截取一个进位?