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Understanding ibeacon distancing
...ually the difference in dB. So:
ratio_dB = txCalibratedPower - RSSI
To convert that into a linear ratio, we use the standard formula for dB:
ratio_linear = 10 ^ (ratio_dB / 10)
If we assume conservation of energy, then the signal strength must fall off as 1/r^2. So:
power = power_at_1_meter...
Which version of the git file will be finally used: LOCAL, BASE or REMOTE?
..., the three-way tab is always the third tab, while the first tab is always selected by default. Is there a way to make the three-way tab selected by default?
– Sam Kauffman
Dec 1 '15 at 20:33
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What is the need of JSF, when UI can be achieved with JavaScript libraries such as jQuery and Angula
...oves the need of all the boilerplate of gathering HTTP request parameters, converting/validating them, updating the model values, executing the right Java method to do the business stuff and generating the HTML/CSS/JS boilerplate code. With JSF you basically end up with a XHTML page as view definiti...
How do you match only valid roman numerals with a regular expression?
... where text such as "the Red Seacl and the Great Barrier Reefcli" had been converted to the Red Seacl and the Great Barrier Reefcli. But I still had problems with valid words like Tahiti and fantastic are scrubbed into Tahit and fantasti.
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How to get the contents of a webpage in a shell variable?
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Wget 1.14 version is not accepting convert_links = on with -O- option. It is failing with error -k can be used together with -O only if outputting to a regular file.. Is it expected?
– Prasad Bonthu
Jul 17 '18 at 14:40
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Submitting HTML form using Jquery AJAX
...ral web actions GET, POST, PUT, and DELETE; these directly correspond with SELECT/Retreiving DATA, INSERTING DATA, UPDATING/UPSERTING DATA, and DELETING DATA. A default HTML/ASP.Net webform/PHP/Python or any other form action is to "submit" which is a POST action. Because of this the below will al...
How do I check if a list is empty?
...wraps your input into an array if it's a list, tuple, etc., and optionally converts it to your chosen dtype. So it's very quick whenever it can be, and it ensures that you just get to assume the input is a NumPy array. We usually even just use the same name, as the conversion to an array won't mak...
How to display unique records from a has_many through relationship?
...r the SQL DISTINCT stmt (e.g. has_many :products, :through => :orders, :select => "DISTINCT products.*). In the first case, ALL records are fetched and rails removes the duplicates for you. In the later case, only non-duplicate records are fetched from the db so it might offer better performan...
Set default syntax to different filetype in Sublime Text 2
...ax type in the lower right corner of the window. This will open the syntax selection menu with the option to Open all with current extension as... at the top of the menu.
Updated 2016-04-19: As of now, this also works for Sublime Text 3.
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What exactly is metaprogramming?
...data structure. This is known as homoiconicity. Secondly, LISP code can be converted into data easily using QUOTE. For example (+ 1 2 3) adds 1+2+3 and (QUOTE (+ 1 2 3)) creates an expression that adds 1+2+3 when evaluated. Thirdly, LISP provided a meta-circular evaluator that allows you to use the ...