Mathematics

Associated with Math.SE; for both general discussion & math qu...
May 8, 2015 13:45
i think it is a + b >= 1/3 (a +b + c)
May 8, 2015 13:42
if a or b then a, b, c. How can I build an equation (with + and - ) around this
 
Dec 12, 2014 16:43
but thanks for the help. I really appreciate it :)
Dec 12, 2014 16:43
souski?
Dec 12, 2014 16:40
and can lead someone to thinking about the problem in a certain way
Dec 12, 2014 16:40
I think what you provided can be a comment
Dec 12, 2014 16:35
that bridge might have some pot holes in it and therefore will have a lower condition
Dec 12, 2014 16:35
Think of a 5 km road that has a bridge in the middle
Dec 12, 2014 16:35
but it could also differ in a group
Dec 12, 2014 16:35
Correct
Dec 12, 2014 16:34
define a distance measure for your section ID
or simply remove the String part and use the integer. Then use
hierarchical cluster algorithms. I would suggest ward or
complete method. Not sure though. Give it a try and see what
works
Dec 12, 2014 16:34
here's an answer I got from IRC:
Dec 12, 2014 16:34
so the first 500 m were done in 2005, while another is done in 2014
Dec 12, 2014 16:34
well each road might be built in a different year
Dec 12, 2014 16:32
Thanks for your help so far. Initially, I was thinking of doing a python script that runs through the data and whenever and have a certain acceptable sigma value that it reaches
Dec 12, 2014 16:29
I just edited my question to reflect on your suggestions. feel free to delete your comments as I will delete mine as well
Dec 12, 2014 16:29
ok
Dec 12, 2014 16:25
A001_002 is the 50 meter road section that comes directly after A001_001
Dec 12, 2014 16:24
A001_001 is a 50 meter road section that has a condition rating of 3
Dec 12, 2014 16:24
No
Dec 12, 2014 16:23
sorry what I meant is that each record represents a 50 m section so over 50 m, the condition rating is 4
Dec 12, 2014 16:22
meters
Dec 12, 2014 16:22
the data is collected in 50 m bins
Dec 12, 2014 16:21
@robbieboy74 the data will be part of a larger heuristic model that's already built and functioning. We don't need data at the 50m level, we need it at between 200 and 500m. Otherwise, the model will be very long to optimize. also, condition ratings, let's say between 0 and 3 indicate Poor, whereas 'Fair' is between 3 and 5, etc.
Dec 12, 2014 16:21
@robbieboy74 there is no time factors, it's just sections of roads segmented over 50 m intervals. Clustering is probably a better term to what I'm trying to do. I'm not very familiar with the technical terms
Dec 12, 2014 16:21
@robbieboy74 the data is sequential
 

 GIS

Jump in and ask questions or talk about anything GIS.
Oct 24, 2014 19:36
thanks so much for your help so far though
Oct 24, 2014 19:36
I might not be here, if I have any other questions I might email you or ask again here
Oct 24, 2014 19:27
now time to update the joins
Oct 24, 2014 19:26
jeez that was blazing fast
Oct 24, 2014 19:25
this way, I can do some unit tests on my calcs
Oct 24, 2014 19:25
yup figured that out!
Oct 24, 2014 19:22
awesome ! thanks
Oct 24, 2014 19:14
thanks
Oct 24, 2014 19:12
ok
Oct 24, 2014 19:11
here's what I did for the calcs pastie.org/private/gnme9pnm1q7hwsloglzsa
Oct 24, 2014 19:08
so when you say data tarnsfer between tables, you mean regular data join/
Oct 24, 2014 19:07
any other recommendations you'd recommend?
Oct 24, 2014 19:04
Awesome. Well this is very helpful!
Oct 24, 2014 19:03
is that ok?
Oct 24, 2014 19:03
awesome. One thing I find is that it takes 37 seconds for arcpy, to load itself, open the geodatabase and duplicate a featureclass
Oct 24, 2014 19:02
thank you so much for all yoru help so far .. just by doing the non join stuff in cursors shaved about 100 secodns off of a 400 second process
Oct 24, 2014 18:50
I figured out the update cursor. You're right it's much faster! thank for hte tip
Oct 24, 2014 17:51
Sounds good
Oct 24, 2014 17:31
I'll be back in a bit headed to a meeting. I 'm not suer what you mean by isolate
Oct 24, 2014 17:25
could very well be!
Oct 24, 2014 17:22
we have a software that takes in a shape file as input to do some linear programming and markov chains modelling. The input layer comes from the road data provider as a geodatabase. Another Event table comes in that indicates which roads will be worked on over the next few years. I combine the shape file with event table to create one shape file to be used in teh software
Oct 24, 2014 17:14
I really do appreciate this. Thank you very much
Oct 24, 2014 17:11
my email address by the way is my username here at the glorious gmail if yo uwant to share anythign that way
Oct 24, 2014 17:03
I'm reading the documentation on that right now. IT doesnt' seem very clear but I'm sure I'll get it eventually