A little more on configuration.

brian_pinder662

I am trying to enter the following variable into a dimension box   #PipeRad21mm ? 105mm : 99.8066mm       What I am trying to say is (If the PipeRad is 21mm then this dimension is 105mm otherwise it is 99.8066mm)
but the the dimension box will not accept this saying please enter a valid expression
Could anyone please say where i am going wrong
Any help will help me to move on.  Best Regards Brian.

john_mcclary

you have to use the "==" operator between your variable and first dimension

#PipeRad == 21 mm ? 105 mm : 99.8066 mm

john_mcclary

good to know

john_mcclary

What part isn't sinking in? the format of the inline If statement? 

variable = (something is true) ? (then do this) : (otherwise it is false so do this)

anything before the ? is a test condition, which is comparing two objects at a time using comparison operators
x > y    is greater then
x < y    is less than
x >= y  is greater than or equal to
x <= y  is less than or equal to
x == y  is equal to
x != y   is not equal to
x && y compares two booleans, result must be true example: (1 <= 2 && 3 < 4) = true
x || y    compares two booleans, result will be true if ether x, y, or both are true

then there are some more commands you will need find on the featurescript documentation like Ilya showed
tolerantEquals(x, y)

the format above is a common short hand version of an If-else statement

If (boolean is true)
{ then do this }
else
{ otherwise do this }

you can nest multiple statements together to hone in on a specific result.
an easier way to read it would be to write it out like a normal If statement in notepad, then shrink it into one line
example:

x > y ? z<br>: x == y ? a<br>: b<br><br>becomes:<br>x > y ? z : x == y ? a : b<br><br>if x > y then the result of the equation will be z<br>if x = y then the result of the equation will be a<br>if all else fails then the result of the equation will be b<br><br>You can also use ( ) as much as you need to help visualize your groups<br>(x > y)? z :(x == y)? a :b

Hope that helps, not make things worse

john_mcclary

you have to use the "==" operator between your variable and first dimension

#PipeRad == 21 mm ? 105 mm : 99.8066 mm

ilya_baran

Unfortunately, the reality of computer math is that a tolerance is best for such comparisons.  You can use
tolerantEquals(#PipeRad, 21 mm) ? 105 mm : 99.8066 mm
and unlike == it'll be robust to rounding errors if #PipeRad is computed in any way other than evaluating the expression "21 mm"

john_mcclary

good to know

brian_pinder662

Thank you all for your help, getting there slowly. Watched variable webinar several times but couldn't quite get it. afraid things don't sink in as quick when you get my age. Once again many thanks, Moving on.  Brian

john_mcclary

What part isn't sinking in? the format of the inline If statement? 

variable = (something is true) ? (then do this) : (otherwise it is false so do this)

anything before the ? is a test condition, which is comparing two objects at a time using comparison operators
x > y    is greater then
x < y    is less than
x >= y  is greater than or equal to
x <= y  is less than or equal to
x == y  is equal to
x != y   is not equal to
x && y compares two booleans, result must be true example: (1 <= 2 && 3 < 4) = true
x || y    compares two booleans, result will be true if ether x, y, or both are true

then there are some more commands you will need find on the featurescript documentation like Ilya showed
tolerantEquals(x, y)

the format above is a common short hand version of an If-else statement

If (boolean is true)
{ then do this }
else
{ otherwise do this }

you can nest multiple statements together to hone in on a specific result.
an easier way to read it would be to write it out like a normal If statement in notepad, then shrink it into one line
example:

x > y ? z<br>: x == y ? a<br>: b<br><br>becomes:<br>x > y ? z : x == y ? a : b<br><br>if x > y then the result of the equation will be z<br>if x = y then the result of the equation will be a<br>if all else fails then the result of the equation will be b<br><br>You can also use ( ) as much as you need to help visualize your groups<br>(x > y)? z :(x == y)? a :b

Hope that helps, not make things worse

brian_pinder662

John, thanks for taking the time to give this detailed explanation, going to print it off for careful study and more practice.
all the best Brian.