polyline manipulation

hi,

i am having some problems with lists.

for example, i have a polyline list, and i want to take its 1st point, use it during a "while" routine... then thake the seccond point, use the routine again, and again with 3rd point, and etc.....

so, here is a random poyline list:

(

(-1 . ) (0 . "LWPOLYLINE") (330 . )

(5 . "1F2") (100 . "AcDbEntity") (67 . 0) (410 . "Model") (8 . "0") (100 . "AcDbPolyline")

(90 . 6) (70 . 0) (43 . 0.0) (38 . 0.0) (39 . 0.0)

(10 1232.28 1105.94) (40 . 0.0) (41 . 0.0) (42 . 0.0) (91 . 0)

(10 1823.53 1585.85) (40 . 0.0) (41 . 0.0) (42 . -0.741819) (91 . 0)

(10 2257.98 1292.03) (40 . 0.0) (41 . 0.0) (42 . 2.5507) (91 . 0)

(10 2914.56 1670.74) (40 . 0.0) (41 . 0.0) (42 . -0.859067) (91 . 0)

(10 2950.49 2163.71) (40 . 0.0) (41 . 0.0) (42 . 2.38592) (91 . 0)

(10 1871.63 3100.83) (40 . 0.0) (41 . 0.0) (42 . 0.203773) (91 . 0)

(210 0.0 0.0 1.0)

)

if it was a line or something like that, i could use "" (assoc 10 .... but i have 6 of them!, so, what do i do?

(foreach pt (mapcar	'cdr 	(vl-remove-if-not
  '(lambda (j) (= (car j) 10)) lst))
.....
.....
)

Welcome to CAD Tutor Deko

(setq elist (entget [i][color=green]<lwpolyline ename>[/color][/i]))
(while (setq item (assoc 10 elist))
   (setq point (cdr item)
         elist (cdr (member item elist))
   )
   [i][color=green]... < do something > ...[/color][/i]
)

(foreach item (entget [i][color=green]<lwpolyline ename>[/color][/i])
   (if (= 10 (car item))
       [i][color=green]... < do something > ...[/color][/i]
   )
)

PS: Please edit your post and enclose your code with code tags:

[highlight][noparse]

[/noparse][/highlight] Your code here [highlight][noparse]

[/noparse][/highlight]

Guess you posted good 'ol assoc/member route Lee.

Man you are fast

Cheers pBe

;;Function To Mark Each Node Points With Point IDs

;; Writtend By Ganesh ....

(defun c:mnp(/ os lay str cntr l str strt ent vert pts)
 (setq os(getvar "osmode"))
 (setq lay(getvar "clayer"))
 (setvar "cmdecho" 0)
 (setvar "osmode" 0)
 (command "UNDO" "G")
 (prompt "\nSelet Valid Polylines.")
 (if(setq ss(ssget '(( 0 . "LWPOLYLINE"))))
   (progn
     (setq str(getstring  T "\nEnter Prefix ::"))
     (command "LAYER" "M" "Id_Points" "c" "62" "" "")
     (setq l(sslength ss))
     (setq cntr 0)
     (repeat l
(setq ssn(ssname ss cntr))
(setq strt 1)
       (setq ent(entget ssn))
       (foreach VERT Ent
        (if(= (car VERT) 10)
    (progn
       (setq PTS(cdr VERT))
       (command "TEXT" "J" "MC" PTS (*(getvar "DIMSCALE") 1) "0" (strcat(strcase str) "-"(itoa strt)))
       (setq strt(1+ strt))
    );progn
 );if
       );foreach
       (setq cntr(1+ cntr))
     );;reapet
    );;progn
   (princ "\nError...No Valid Object Selected")
   );if
(setvar "osmode" os)
(setvar "clayer" lay)
(command "UNDO" "E")
(setvar "cmdecho"1)
(princ)
 );;defun