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What algorithms compute directions from point A to point B on a map?
...modifications:
Instead of doing Dijkstra's once from source to dest, you start at each end, and expand both sides until they meet in the middle. This eliminates roughly half the work (2*pi*(r/2)^2 vs pi*r^2).
To avoid exploring the back-alleys of every city between your source and destination, you...
Ruby: extend self
...nitialize
@host = 'http://cheat.errtheblog.com/'
@http = Net::HTTP.start(URI.parse(@host).host)
end
def sheet(name)
@http.get("/s/#{name}").body
end
end
# then you use it
Cheat.instance.sheet 'migrations'
Cheat.instance.sheet 'yahoo_ceo'
But that’s crazy. Fight the power.
req...
Rounded UIView using CALayers - only some corners - How?
...us values in the code. The code for all corners is there, so use that as a starting point and delete the parts that create corners you don't need. Note that you can make rectangles with 2 or 3 rounded corners too if you want.
The code's not perfect, but I'm sure you can tidy it up a little bit.
s...
Node.js or Erlang
... I would suggest writing a standalone functional program first before you start building web apps. An even easier first step, since you seem comfortable with Javascript, is to try programming JS in a more functional style. If you use jQuery or Prototype, you've already started down this path. Tr...
How to evaluate a math expression given in string form?
...turn -parseFactor(); // unary minus
double x;
int startPos = this.pos;
if (eat('(')) { // parentheses
x = parseExpression();
eat(')');
} else if ((ch >= '0' && ch <= '9') || ch == '.') { // numbers
...
How do I create an Excel (.XLS and .XLSX) file in C# without installing Microsoft Office?
...us - GNU (LGPL) - No longer maintained
EPPlus 5 - Polyform Noncommercial - Starting May 2020
NPOI - Apache License
Here some example code for ExcelLibrary:
Here is an example taking data from a database and creating a workbook from it. Note that the ExcelLibrary code is the single line at the bott...
How can we match a^n b^n with Java regex?
... is finalized will be done in Java.
Step 1: Lookahead for assertion
Let's start with a simpler problem: we want to match a+ at the beginning of a string, but only if it's followed immediately by b+. We can use ^ to anchor our match, and since we only want to match the a+ without the b+, we can use ...
What is REST? Slightly confused [closed]
...rst read Ryan Tomayko's post How I explained REST to my wife; it's a great starting point. Then read Fielding's actual dissertation. It's not that advanced, nor is it long (six chapters, 180 pages)! (I know you kids in school like it short).
EDIT: I feel it's pointless to try to explain REST. It ...
Difference between GeoJSON and TopoJSON
...l shapefile : bl.ocks.org/4485308 and bl.ocks.org/4348435. TopoJSON really started to sink in when I finally grasped how I could represent multiple features (national, departmental, and municipal boundaries) with the same data in the same file (you can't do that with geojson). This is accomplished ...
Postgres manually alter sequence
...ts_id_seq LASTVALUE 22
This would work:
ALTER SEQUENCE payments_id_seq RESTART WITH 22;
and is equivalent to:
SELECT setval('payments_id_seq', 22, FALSE);
More in the current manual for ALTER SEQUENCE and sequence functions.
Note that setval() expects either (regclass, bigint) or (regclass, ...