math operations in relations

how do you insert math symbols (cos tan pi etc) into a relation?

how do you turn an absolute number into an integer by rounding? (Required
for instance to calculate the number of instances of a pattern).

example, number of instances of a rotational pattern:

p1=(d2*pi)/d3

where

p1 = number of instances
d2 = pitch diameter
d3 = circumferential pitch of instance

 

From Rod Giles:-



Dear David,

Relations editor recognises the following mathematical constants:

pi



Relations editor recognises the following mathematical, logical and internal

functions (Wildfire 2.0):

+

-

/

*

^

abs

acos

asin

atan

atan2

cable_len

ceil

comparegraphs

cos

cosh

eang

ecoordx

ecoordy

edist

elen

evalgraph

exists

exp

extract

false

floor

if

itos

ln

log

lookup_inst

massprop_param

material_param

max

min

mp_assigned_mass

mp_cg_x

mp_cg_y

mp_cg_z

mp_mass

mp_surf_area

mp_volume

no

rel_model_name

rel_model_type

search

sim_load_value

sim_mc_value

sim_shell_thickness

sin

sinh

smt_def_bend_rad

smt_thickness

sqrt

string_length

tan

tanh

trajpar

trajpar_of_pnt

true

yes

Click on the function button to see a list. If you're working on 2001 you

need to apply the following config options:

new_relation_ui yes

new_parameter_ui yes

I make sure you have an integer number, use ceil (ceiling function) or floor

(floor function), depending on whether you what 1 more or 1 less, e.g. if

your equation resulted in p1 = 3.26, then floor(3.26) = 3, ceil(3.26) = 4.

Adjust the formula,

p1=ceil((d2*pi)/d3)

p1=floor((d2*pi)/d3)

according to your requirement.

Hope this helps,

Rod Giles

Technical Director

Elite Consulting Ltd.

www.elite-consulting.com

Pro/Enginer Consultants, Trainers and Value Added Reseller