AutoCAD Map 3D

[#1]

Hello. I have a data table showing points surrounding a central source.

I would like to create a calculation that adds a column in my data table of the points; that shows the distance between each respective point, and the central point.

My knowledge in expression building is limited, and Im hoping someone here could help me.

I assume I would be using some form of calculation using the geom, and the X and Y locations, however Im coming up with nada.

Can anyone help?

Thanking you in advance

Colin

[#2]

I don't believe you can connect 2 features in a calculation. Therefore you want be able to calculate the distance between. That's what lines are for 

How many points are we talking?

[#3]

sqrt (x^2 + y^2) = the dist on a 2d plane

if origin is 0,0

then

 Sqrt ( Power (  X1 , 2 )  +  Power (  (Y1, 2 ))

so subract x & y of your central point from x1 and y1 of each point

ie origin at 1,1

 Sqrt ( Power ( ( X1-1) , 2 )  +  Power (  (Y1-1) , 2 ))

dave

[#4]

example i used  UTM83-19 coord sys.  look at the data table. I think this is what you are looking for.

Dave

[#5]

Thank you guys.

That was the type of solution that I was looking to implement.

I have 20 points (residences) surrounding a potential site.

I was just measuring the distance from the centre of the proposed site ( a coordinate), to each residence (nodes surrounding the proposed site)

I was writing the distances down and adding them to a spreadsheet. I wanted to shortcut that by having the distances automatically update in the data table if I moved a node (residence). Then I would export the data table into the spreadsheet.

Colin