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Arduino Sketch upload issue - avrdude: stk500_recv(): programmer is not responding
...ly to the Leonardo as it has independent USB handling);
if the USB to UART converter does not have a problem (FTDI on older Duemilanove or ATmega16U2 on newer Arduino Unos);
if the ATmega328 chip is fried or wrongly installed;
if the bootloader has been overwritten or is failing;
if the right baudra...
How to check if a string is a valid hex color representation?
...and ignore it and anything after it. It then takes the beginning "abc" and convert it to 2748 (which is also the result of parseInt("abcZab", 16), proving that's the logic happening). As the name implies, parseInt parses a string. Just like if you were parsing a number with units on it with a radix ...
Python dictionary from an object's fields
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Agreed. Note that you can also convert the other way (dict->class) by typing MyClass(**my_dict), assuming you have defined a constructor with parameters that mirror the class attributes. No need to access private attributes or override dict.
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What is the Swift equivalent of respondsToSelector?
...ional unwrapper operator. This allows you to call a method on an object if and only if the object exists (not nil) and the method is implemented.
In the case where you still need respondsToSelector:, it is still there as part of the NSObject protocol.
If you are calling respondsToSelector: on an O...
PostgreSQL Autoincrement
I'm switching from MySQL to PostgreSQL and was wondering how I can do autoincrement values. I saw in the PostgreSQL docs a datatype "serial", but I get syntax errors when using it (in v8.0).
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Qt 5.1.1: Application failed to start because platform plugin “windows” is missing
...er people by directly providing the solution. This should not be forgotten and so far my answer helped a lot of people. Therefore my question is definitely not a duplicate. By the way: The accepted answer within the provided link on top does not solve the problem !
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How to create index on JSON field in Postgres?
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JSON Functions and Operators
– Jared Beck
Sep 11 '13 at 20:27
39
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Difference between constituency parser and dependency parser
...eterministic (rule-based) transformation on the constituency parse tree to convert it into a dependency tree.
More can be found here:
http://en.wikipedia.org/wiki/Phrase_structure_grammar
http://en.wikipedia.org/wiki/Dependency_grammar
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efficient way to implement paging
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LinqToSql will automatically convert a .Skip(N1).Take(N2) into the TSQL syntax for you. In fact, every "query" you do in Linq, is actually just creating a SQL query for you in the background. To test this, just run SQL Profiler while your application i...
Reorder levels of a factor without changing order of values
...sapply(dtf, class)
numbers letters
"integer" "factor"
Now, if you convert this factor to numeric, you'll get:
# return underlying numerical values
1> with(dtf, as.numeric(letters))
[1] 1 2 3 4
# change levels
1> levels(dtf$letters) <- letters[4:1]
1> dtf
numbers letters
1 ...