Author Topic: Need help to convert this equation.  (Read 1673 times)

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HasanCAD

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Need help to convert this equation.
« on: May 21, 2012, 09:56:10 AM »
I tried to convert these equations to use in lisp but giving me diffident results than Excel.
Could some one help me to convert this equations to use in Lisp?

Thanks

HasanCAD

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Re: Need help to convert this equation.
« Reply #1 on: May 21, 2012, 10:08:17 AM »
This is input
Code: [Select]
(and (setq p1 (getpoint "\nPick first point."))
   (setq p2 (getpoint p1 "\nPick second point."))
   (setq *L* (cond ((getint
(strcat "\nWhat is HIGH Point <"
(itoa (setq *L* (cond ( *L* ) ( 160 )))) ">: "))) ( *L* )))
   (setq *c* (cond ((getint
(strcat "\nWhat is LOW Point <"
(itoa (setq *c* (cond ( *c* ) ( 35 )))) ">: "))) ( *c* )))
   )
(setq step 1000
dist (distance p1 p2)
#pt (fix (/ (/ dist step) 2))
ang  (angle p1 p2)
pang (+ ang (/ pi 2.))
idx  1
   )

Equation
Code: [Select]
(setq S  (* 0.8 Dist);
   X  (* idx step)
   a1 (/ (* (* (- *L* *c*) 0.1) Dist) (/ Dist 2));
   ys1 (- *L* a1);
   A  (/ (- *c* ys1) (- (/ (* S S) 4) (/ (* S S)2)));
   B  (- 1 (* A S));
   y  (+ (+ (* A (* X X)) (* B X)) ys1)
   yr (round y 5)
     )

Keith™

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Re: Need help to convert this equation.
« Reply #2 on: May 21, 2012, 10:13:04 AM »
You have to calculate the variables used in later calculations first.
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HasanCAD

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Re: Need help to convert this equation.
« Reply #3 on: May 21, 2012, 11:33:43 AM »
You have to calculate the variables used in later calculations first.

Is it OK
Code: [Select]
(setq Dst2 (/ Dist 2)
S   (* 0.8 Dist)
SS  (* S S)
SS2 (/ SS 2)
SS4 (/ SS 4)
S42 (- SS4 SS2)
X   (* idx step)
XX  (* X X)
XXA (* A XX)
XB  (* B X)
XAB (+ XXA XB)
Lc  (- *L* *c*)
Lc1 (* Lc 0.1)
LcD (* Lc1 Dist)
a1  (/ LcD Dst2)
ys1 (- *L* a1)
yc  (- *c* ys1)
A   (/ yc S42)
B   (- (* A S))
y   (+ XAB ys1)
yr  (round y 5)
)

HasanCAD

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Re: Need help to convert this equation.
« Reply #4 on: May 21, 2012, 12:15:59 PM »
I got it

Thanks for help