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What is the data model to store millions of record efficiently in the aerospike database?
Use case : storing millions of bid(value) for a particular id(key) and
also need to iterate over the values and operate on them as fast as possible and store them separately.
Currently :using set as the key and bin as the value.
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I would like to use lines in captured photos to detect and correct image skew. How would I do this in Go? Most of the packages I've seen on github don't seem to support edge detection or some way to figure out a contiguous line or perhaps a couple markers like QR codes use.
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We would like to implement a new feature in our app where users can see some stores sorted by proximity. Currently in our database we just have fields of string (country, state, city, address). In this situation which would be the best way to implement this feature? Create a script to discover the geolocation of every row? Or is there something better/simpler?
You need to convert country/state/city/address to latitude & longitude. Having script to convert all your data to new format is first step you should done. When you have lat/lng points then you can do some math to find stores by proximity.
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I want to plot data from multiple files to one page using xmgrace.
Example:
I have files name a.dat b.dat c.dat with data in two columns.
Now I want to plot the data from the *.dat files in different sub-plots using xmgrace. The Sub-plot Matrix is shown in the picture.
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I want to store user's current location when they log in and display only those users on map which are at a particular distance away from current_user(say 20km).
Popular ruby Geocoder gem has similar functionality. Please checkout the Ryan's screencast for detail.
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Given 20 GB of data (normally numbers) and you have only 1GB of RAM, How will you sort the data?
You can use something similar to merge sort.
Sort 20 groups of numbers and write them to disk. Once their sorted read from all groups simultaneously using a buffer and print out the ordered master set. For this last merge step you should only need constant memory.