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Simple calculations for working with lat/lon and km distance?
...long coordinates are expressed in degrees, while the cos function in most (all?) languages typically accepts radians, therefore a degree to radians conversion is needed.
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Preserve line endings
... run sed to do some substitution on windows and I noticed that it automatically converts line endings to Unix (\n). Is there an option to tell sed to use Windows line endings (\r\n) or even better to preserve the line endings from the file?
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Java enum - why use toString instead of name
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It really depends on what you want to do with the returned value:
If you need to get the exact name used to declare the enum constant, you should use name() as toString may have been overriden
If you want to print the enum const...
Is there a native jQuery function to switch elements?
... I like this option the best! Simple and nicely compatible. Allthough i like to use el1.insertBefore(el2) and el1.insertAfter(el2) for readability.
– Maurice
Feb 1 '12 at 13:43
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quick random row selection in Postgres
... make It sense to use a N less than SELECT COUNT(*)?, I mean, not use all the values in the table but only a part of them?
– Juan
Mar 14 '11 at 11:00
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get list of pandas dataframe columns based on data type
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this doesn't work if all your dataframe columns are returning object type, regardless of their actual contents
– user5359531
Jul 17 '17 at 23:46
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How can I check for “undefined” in JavaScript? [duplicate]
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I personally use
myVar === undefined
Warning: Please note that === is used over == and that myVar has been previously declared (not defined).
I do not like typeof myVar === "undefined". I think it is long winded and unnecessar...
Unable to create/open lock file: /data/mongod.lock errno:13 Permission denied
How to I get mongo to use a mounted drive on ec2? I really do not understand. I attached a volume on ec2 formatted the drive as root and start as root and yet as root I cant access? I am running on ubuntu 12.04. No other mongo is running
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Get a specific bit from byte
I have a byte, specifically one byte from a byte array which came in via UDP sent from another device. This byte stores the on/off state of 8 relays in the device.
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Rails - How to use a Helper Inside a Controller
... use these methods. Also, including the helper into the controller exposes all the helper's methods as publicly accessible actions which is not good. view_context is the way to go in Rails 3.
– GregT
Sep 12 '13 at 3:48
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