Example: Including Units with Relations
This example uses the following parameters and dimensions:
|
Parameter or dimension
|
Units
|
|---|---|
|
A
|
unitless
|
|
B
|
inch
|
|
d1
|
mm
|
|
d2
|
mm
|
The following table lists sample relations that use parameters with and without units.
 |
You can declare units on the left side of a relation only for newly created parameters.
|
|
Sample Relation
|
Verification status
|
Comments
|
|---|---|---|
|
d1=d2
|
OK
|
|
|
d1=d2*A
|
OK
|
|
|
d1=B
|
OK
|
Value of B is converted to mm. For example, if d2=1 and B=1, d1=25.4.
|
|
d1=d2+B
|
OK
|
|
|
d1=5
|
Error
|
This relation is not treated as an error if relation_num_const_units is set to no.
|
|
d1=5[mm]
|
OK
|
|
|
A=d1
|
Error
|
This relation is not treated as an error if relation_num_const_units is set to no.
|
|
A[mm]=d1
|
Error
|
A is a unitless parameter and cannot accept units on the left side of the equation.
|
|
d1=A
|
Error
|
This relation is not treated as an error if relation_num_const_units is set to no.
|
|
d1=A[mm]
|
OK
|
|
|
d1=A[inch]
|
OK
|
A is converted to mm. If A=1, then d1=25.4.
|
|
d1=d2+5
|
Error
|
This relation is not treated as an error if relation_num_const_units is set to no.
|
|
d1=d2+5[mm]+.2[cm]
|
OK
|
Units are converted to mm.
|
|
A=d1+d2
|
This relation is not treated as an error if relation_num_const_units is set to no.
|