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1. Top results related to what is the frequency of a pianoin function

   • What is the fastest way to get the frequency of a factor in R?

     Top Answer

     Answered Nov 12, 2014 · 1 votes

     require(digest)require(ff)require(ffbase)-test.vector.ffdf = as.ffdf(as.ff(as.factor(sample(sapply(1:10, digest), 50000000, replace = T))))test.vector.ffdf$one <- ff(1L, length = nrow(test.vector.ffdf))system.time(binned_sum(x = test.vector.ffdf$one, bin = test.vector.ffdf$x))# user system elapsed # 1.463 0.372 1.835

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     1/5

   • What is the relationship between a static function of a class and the constructor of the class?

     Top Answer

     Answered Apr 14, 2011 · 2 votes

     There is no dependency relationship, that is, you can call the static method without constructing an instance with the syntax "Class::method()"

     class someclass{public: someclass() { std::cout << "someclass constructor" << std::endl; } static void staticmethod() { std::cout << "someclass staticmethod" << std::endl; }};

     and then

     int main(int argc, char** argv){ someclass::staticmethod(); return 0;}

     you will see printed out "someclass staticmethod" with no mention or need for invoking the constructor.

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     2/5

   • What is the return type of a generic function of a partial type which returns only the provided keys?

     Top Answer

     Answered Sep 28, 2020 · 2 votes

     The problem is how inference works with explicit and default type parameters. If you specify one type parameter, no inference will happen for the rest of the parameter (their default values will be used)

     The usual workaround for this is to use function currying:

     function doTheThings<T>() { return function <U extends Partial<T>>(values: U): U { return values; }}type Thing = { name: string, age: number };const seuss = doTheThings<Thing>()({ name: 'seuss'});// this value should be a string since it was included as an argument to the functionconst name: string = seuss.name;// error age does not exist const age: undefined = seuss.age;

     Playground Link

     The function above will only return an object with the keys that were passed in. If you want to preserve the unpassed keys as well you can intersect with Partial<T>:

     function doTheThings<T>() { return function <U extends Partial<T>>(values: U): U & Partial<T> { return values; }}const age: number | undefined = seuss.age;

     Playground Link

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     3/5

   • What is the maximum height of a Btree as a function of n?

     Top Answer

     Answered Apr 25, 2015 · 1 votes

     Height of binary tree h=log(n+1)-1

     Here is the derivation

     Here i am assuming height of root is zero

     so

     n=2^0+2^1+2^2........2^h-

     Apply Geometric progression formula & get

     h=log(n+1)-1.-

     Here log base is 2. So when there is only single node at every level. We can get log(2)base 2, n times SO Maximum height becomes

     h=n-1 -

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     4/5

   • What is the correct error part of the Result type of a function propagating different error types?

     Top Answer

     Answered May 30, 2020 · 3 votes

     You should define your own error type, which includes all possible errors that could happen:

     #[derive(Debug)]enum Error { Io(io::Error), ParseInt(num::ParseIntError)}impl From<io::Error> for Error { fn from(other: io::Error) -> Error { Error::Io(other) }}impl From<num::ParseIntError> for Error { fn from(other: num::ParseIntError) -> Error { Error::ParseInt(other) }}

     The From conversions allow the ? operator to work as expected.

     You can save a lot of typing by using one of the several crates that will generate the boilerplate for you. Some popular ones are thiserror and snafu.

     I prefer thiserror because it only adds the implementations that you would otherwise write yourself and, if you are writing a library, it is transparent to your library's users. snafu is arguably more powerful - it generates a lot more code, but is opinionated in what it generates, so you will need to get used to its paradigm in order to take full advantage of it, and the snafu concepts will become part of your library's API.

     Using thiserror, the code above is reduced to:

     use thiserror::Error;-#[derive(Debug, Error)]enum Error { #[error("IO Error: {0})] Io(#[from] io::Error), #[error("ParseInt Error: {0})] ParseInt(#[from] num::ParseIntError)}

     Note that this is also generating Display implementations, which I didn't include above.

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     5/5

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2. en.wikipedia.org › wiki › SchizophreniaSchizophrenia - Wikipedia

   en.wikipedia.org › wiki › Schizophrenia

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   11 hours ago · Schizophrenia is a mental disorder characterized by reoccurring episodes of psychosis that are correlated with a general misperception of reality. Other common signs include hallucinations (typically hearing voices), delusions (i.e., paranoia), disorganized thinking and behavior, social withdrawal, and flat or inappropriate affect.

3. Videos

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     Frequency of a Piano Note

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4. www.geeksforgeeks.org › how-to-remove-rows-basedHow to Remove rows based on count of a specific value in R?

   www.geeksforgeeks.org › how-to-remove-rows-based

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   11 hours ago · In this article, we will see how to sort data frame rows based on the values of a vector with a specific order. There are two functions by which we can sort data frame rows based on the values of a vector. match() functionleft_join() function Example dataset: data &lt;- data.frame(x1 = 1:5, x2 = letters[1:5], x3 = 6:10) data x1 x2 x3 1 1 a 6 2 2 b

5. www.mdpi.com › 2076/3425/14-6 › 567Brain Sciences | Free Full-Text | Age-Related Aspects of Sex ...

   www.mdpi.com › 2076/3425/14-6 › 567

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   11 hours ago · Earlier research has suggested gender differences in event-related potentials/oscillations (ERPs/EROs). Yet, the alteration in event-related oscillations (EROs) in the delta and theta frequency bands have not been explored between genders across the three age groups of adulthood, i.e., 18–50, 51–65, and >65 years. Data from 155 healthy elderly participants who underwent a neurological ...

6. www.ipcb.com › pcb-blog › 10192What is a PCB stencil? - ipcb.com

   www.ipcb.com › pcb-blog › 10192

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   11 hours ago · Stencil, also known as SMT stencil, is a type of SMT specific mold. Its main function is to assist in the deposition of solder paste; The purpose is to transfer an accurate amount of solder paste to the exact location on an empty PCB.

7. thecustomizewindows.com › 2024 › 06IC Based Pianos Explained With Example of 555 Toy Piano

   thecustomizewindows.com › 2024 › 06

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   11 hours ago · It is a remixed circuit created by mr.punch. Types of IC-Based Pianos . Digital pianos are full-sized keyboards that replicate the sound and feel of acoustic pianos using sampled or synthesized tones. They utilize ICs for sound generation, processing, and user interface control, offering features such as weighted keys, touch sensitivity,

8. en.wikipedia.org › wiki › MusicMusic - Wikipedia

   en.wikipedia.org › wiki › Music

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   11 hours ago · Music is experienced by individuals in a range of social settings from being alone, to attending a large concert, forming a music community, which cannot be understood as a function of individual will or accident; it includes both commercial and non-commercial participants with a shared set of common values. Musical performances take different ...