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# Making function for calculating distance

## Making function for calculating distance Tag : python , By : Marcos de Carvalho Date : November 26 2020, 03:01 PM

I wish this helpful for you Using solutions provided in Getting distance between two points based on latitude/longitude and Iterate a list as pair (current, next) in Python I was able to build a Pythonic approach of this problem:
``````import itertools

from collections import namedtuple
from math import sin, cos, sqrt, atan2, radians

Location = namedtuple('Location', ['long', 'lat', 'time'])
all_locations = [
Location(lat=37.481236, long=126.952733, time=1488323400),
Location(lat=37.310045, long=127.101255, time=1488323255),
Location(lat=37.383065, long=126.672596, time=1488323531),
Location(lat=37.383065, long=116.672596, time=1488323230),
]

def distance(loc_a, loc_b):
"""Extracted from: https://stackoverflow.com/questions/19412462"""
R = 6373.0

dlat = lat_b - lat_a
dlong = long_b - long_a

a = sin(dlat / 2)**2 + cos(lat_a) * cos(lat_b) * sin(dlong / 2) ** 2
c = 2 * atan2(sqrt(a), sqrt(1 - a))

return R * c

def pairwise(iterable):
"""Extracted from: https://stackoverflow.com/questions/5434891"""
a, b = itertools.tee(iterable)
next(b, None)
return zip(a, b)

sorted_locations = sorted(all_locations, key=lambda l: l.time)
total_distance = sum(distance(a, b) for a, b in pairwise(sorted_locations))
delta_time = sorted_locations[-1].time - sorted_locations[0].time
print(total_distance, delta_time, total_distance / delta_time)
``````
``````sorted_locations = [l1, l2, l3]
distances = [distance(a, b) for a, b in pairwise(sorted_locations)]
# equivalent to [distance(l1, l2), distance(l2, l3)]
total_distance = sum(distances)
``````

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## Trouble calculating the distance function in bezier clipping

Tag : java , By : Bharath
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Your distance function should not necessarily be anywhere near your two original curves: It's using a completely different coordinate system, i.e. t vs D, as opposed to your original curves using x and y.  i.e. t only goes up to 1.0, and measures how far along, as a ratio of the total length, you are along your curve, and D measuring the distance your curve2 is from curve1's baseline.
Also, when you say ""distance function" between curve1 and a "baseline" of curve2" I think you've mixed up curve1 and curve2 here as in your code you are clearly using the baseline of curve1.

## MySQL Function for calculating Haversine Distance

Tag : mysql , By : user104292
Date : March 29 2020, 07:55 AM
seems to work fine all. , Okay.
Solved it.
`````` DELIMITER \$\$
CREATE FUNCTION haversineDistance
(
lat1 VARCHAR(256),
long1 VARCHAR(256),
lat2 VARCHAR(256),
long2 VARCHAR(256))
RETURNS FLOAT DETERMINISTIC
BEGIN

DECLARE dLat FLOAT;
DECLARE dLong FLOAT;
DECLARE cordLength FLOAT;
DECLARE centralAngle FLOAT;
DECLARE distance FLOAT;

SET radLat1 = CAST(lat1 AS DECIMAL(10,10)) * PI() / 180;
SET radLong1 = CAST(long1 AS DECIMAL(10,10)) * PI() / 180;
SET radLat2 = CAST(lat2 AS DECIMAL(10,10)) * PI() / 180;
SET radLong2 = CAST(long2 AS DECIMAL(10,10)) * PI() / 180;
SET cordLength = POW(SIN(dLat/2),2)+COS(lat1)*COS(lat2)*POW(SIN(dLon/2),2);
SET centralAngle = 2 * ATAN2(SQRT(cordLength), SQRT(1-cordLength));
SET distance = 6367 * centralAngle;

RETURN distance;
END
``````

## Calculating distance between 2 zips by using a function

Tag : sql-server , By : Michael T.
Date : March 29 2020, 07:55 AM
Hope this helps I have a table of which first 3 rows look like: , Please Modify your query as below:
``````        SELECT IDENTITY(INT, 1, 1) ID
,*
,CAST(0 AS FLOAT) dist1
,CAST(0 AS FLOAT) DIST2
INTO #TEMP
FROM #zip

DECLARE @COUNT INT
,@DIST1 FLOAT
,@DIST2 FLOAT
,@MAXID INT

SET @COUNT = 1

SELECT @MAXID = MAX(ID)
FROM #TEMP

WHILE (@COUNT <= @MAXID)
BEGIN
SELECT @DIST1 = dbo.ufnzipcodedist_2012(z1, z2)
,@DIST2 = dbo.ufnzipcodedist_2012(z2, z3)
FROM #TEMP
WHERE ID = @COUNT

UPDATE t
SET T.DIST1 = @DIST1
,t.DIST2 = @DIST2
FROM #TEMP t
WHERE ID = @COUNT

SET @COUNT = @COUNT + 1
END

SELECT *
FROM #TEMP
``````

## Calculating the distance between ZIP Codes in R with the mapdist function

Tag : r , By : Ivan Kitanovski
Date : March 29 2020, 07:55 AM
it helps some times It could be that the zip code on its own is ambiguous. If you include 'USA' in the search string it works
``````library(ggmap)

mapdist(from = c("19111, USA"), to = c("19187, USA"))

#         from         to     m    km    miles seconds  minutes     hours
# 1 19111, USA 19187, USA 21420 21.42 13.31039    1976 32.93333 0.5488889
``````
``````library(googleway)

set_key("your_api_key")

destinations = c("19187, USA"))

# [1] "Philadelphia, PA 19187, USA"
#
# [1] "Philadelphia, PA 19111, USA"
#
# \$rows
# elements
# 1 21.4 km, 21420, 33 mins, 1976, 35 mins, 2101, OK
#
# \$status
# [1] "OK"
``````

## Help with a member function calculating distance

Tag : cpp , By : toki
Date : March 29 2020, 07:55 AM