Skip to main content

geography - Neighboring counties (within the State of Florida) for every county in the State of Florida


When I attempt evaluating:


 Entity[Alachua County, Florida, United States(administrative division)]   [EntityProperty["AdministrativeDivision","BorderingCounties"]]

I get: Missing["UnknownEntity", {"AdministrativeDivision", {"AlachuaCounty", "Florida", "UnitedStates"}}]


The "BorderingCounties" attribute does NOT work on my computer for some unknown reason. Other attributes (like "BorderingStates") work just fine. I'm attempting to find an alternative way to get the result that I'm seeking. I'm attempting to get a list of neighboring counties (within the State of Florida) for every county in the State of Florida. For example; after evaluating:


 counties=EntityList[US counties in Florida (administrative divisions)];

I first try to build a list of neighboring counties; surrounding Escambia county; within the State of Florida as follows:



 counties[[16]

gives: "Escambia County, Florida, United States" but,


Cases[GeoNearest["USCounty", counties[[16]]], Except[counties[[16]]]]

gives: {"Baldwin County, Alabama, United States", "Escambia County, Alabama, United States", "Santa Rosa, Florida, United States"} (which excludes Escambia County, as I want) but, gives me unwanted neighboring counties from the State of Alabama. How can I accommodate another Except within GeoNearest[] to isolate only the counties in Florida? The only neighboring county to Escambia County within the State of Florida should be Santa Rosa County. Similarly;


 counties[45]

gives: "Nassau County, Florida, United States" and


 Cases[GeoNearest["USCounty", counties[[45]]], Except[counties[[45]]]]


gives: {"Baker County, Florida, United States", "Camden County, Georgia, United States", "Charlton County, Georgia, United States", "Charlton County, Georgia, United States","Duval County, Florida, United States"} but, the answer that I'm seeking is: {"Baker County, Florida, United States", "Duval County, Florida, United States"}. The Except command should eliminate those counties located in Alabama and Georgia to isolate the counties in Florida. Thank you!




Comments

Popular posts from this blog

functions - Get leading series expansion term?

Given a function f[x] , I would like to have a function leadingSeries that returns just the leading term in the series around x=0 . For example: leadingSeries[(1/x + 2)/(4 + 1/x^2 + x)] x and leadingSeries[(1/x + 2 + (1 - 1/x^3)/4)/(4 + x)] -(1/(16 x^3)) Is there such a function in Mathematica? Or maybe one can implement it efficiently? EDIT I finally went with the following implementation, based on Carl Woll 's answer: lds[ex_,x_]:=( (ex/.x->(x+O[x]^2))/.SeriesData[U_,Z_,L_List,Mi_,Ma_,De_]:>SeriesData[U,Z,{L[[1]]},Mi,Mi+1,De]//Quiet//Normal) The advantage is, that this one also properly works with functions whose leading term is a constant: lds[Exp[x],x] 1 Answer Update 1 Updated to eliminate SeriesData and to not return additional terms Perhaps you could use: leadingSeries[expr_, x_] := Normal[expr /. x->(x+O[x]^2) /. a_List :> Take[a, 1]] Then for your examples: leadingSeries[(1/x + 2)/(4 + 1/x^2 + x), x] leadingSeries[Exp[x], x] leadingSeries[(1/x + 2 + (1 - 1/x...

mathematical optimization - Minimizing using indices, error: Part::pkspec1: The expression cannot be used as a part specification

I want to use Minimize where the variables to minimize are indices pointing into an array. Here a MWE that hopefully shows what my problem is. vars = u@# & /@ Range[3]; cons = Flatten@ { Table[(u[j] != #) & /@ vars[[j + 1 ;; -1]], {j, 1, 3 - 1}], 1 vec1 = {1, 2, 3}; vec2 = {1, 2, 3}; Minimize[{Total@((vec1[[#]] - vec2[[u[#]]])^2 & /@ Range[1, 3]), cons}, vars, Integers] The error I get: Part::pkspec1: The expression u[1] cannot be used as a part specification. >> Answer Ok, it seems that one can get around Mathematica trying to evaluate vec2[[u[1]]] too early by using the function Indexed[vec2,u[1]] . The working MWE would then look like the following: vars = u@# & /@ Range[3]; cons = Flatten@{ Table[(u[j] != #) & /@ vars[[j + 1 ;; -1]], {j, 1, 3 - 1}], 1 vec1 = {1, 2, 3}; vec2 = {1, 2, 3}; NMinimize[ {Total@((vec1[[#]] - Indexed[vec2, u[#]])^2 & /@ R...

plotting - Plot 4D data with color as 4th dimension

I have a list of 4D data (x position, y position, amplitude, wavelength). I want to plot x, y, and amplitude on a 3D plot and have the color of the points correspond to the wavelength. I have seen many examples using functions to define color but my wavelength cannot be expressed by an analytic function. Is there a simple way to do this? Answer Here a another possible way to visualize 4D data: data = Flatten[Table[{x, y, x^2 + y^2, Sin[x - y]}, {x, -Pi, Pi,Pi/10}, {y,-Pi,Pi, Pi/10}], 1]; You can use the function Point along with VertexColors . Now the points are places using the first three elements and the color is determined by the fourth. In this case I used Hue, but you can use whatever you prefer. Graphics3D[ Point[data[[All, 1 ;; 3]], VertexColors -> Hue /@ data[[All, 4]]], Axes -> True, BoxRatios -> {1, 1, 1/GoldenRatio}]