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Annotation 149625039

#calculus #economics #mathematics

Constant slope does not imply constant elasticity. To see this, consider the linear demand function Q=a-bP, which has constanst slope equal -b. But the elasticity implied by this demand function is E=(dQ/dP)(P/Q)=-b(P/Q). Since the ratio P/Q gets smaller and smaller as Q increases, demand is more leastic at high prices and less elastic at low prices.

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Elasticity vs. Slope?
Best Answer helper answered 5 years ago Constant slope does not imply constant elasticity. To see this, consider the linear demand function Q=a-bP, which has constanst slope equal -b. But the elasticity implied by this demand function is E=(dQ/dP)(P/Q)=-b(P/Q). Since the ratio P/Q gets smaller and smaller as Q increases, demand is more leastic at high prices and less elastic at low prices. This makes intuitive sense, since it is reasonable that quantity demanded is more sensitive at high prices than it is at low prices. A demand function of the form Q=b/P is called a constant elasticity demand function. To see this, note that E=(dQ/dP)(P/Q)=(-b/P^2)(P/Q)=(-b/P^2)(P/... a constant. More generally, if

Flashcard 149627805

Tags

#finance #ted-spread

Question

For example, if the T-bill rate is 5.10% and ED trades at 5.50%, the TED spread is [...]bps.

Answer

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For example, if the T-bill rate is 5.10% and ED trades at 5.50%, the TED spread is 40 bps.

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TED spread - Wikipedia, the free encyclopedia
ge dropped T-bill futures after the 1987 crash,[1] the TED spread is now calculated as the difference between the three-month LIBOR and the three-month T-bill interest rate. The size of the spread is usually denominated in basis points (bps). For example, if the T-bill rate is 5.10% and ED trades at 5.50%, the TED spread is 40 bps. The TED spread fluctuates over time but generally has remained within the range of 10 and 50 bps (0.1% and 0.5%) except in times of financial crisis. A rising TED spread often presages a

Flashcard 149627812

Tags

#finance #ted-spread

Question

For example, if the T-bill rate is 5.10% and ED trades at [...], the TED spread is 40 bps.

Answer

5.50%

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For example, if the T-bill rate is 5.10% and ED trades at 5.50%, the TED spread is 40 bps.

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Flashcard 149627843

Tags

#finance #swaps

Question

An overnight indexed swap (OIS) is an interest rate swap where the periodic floating rate of the swap is equal [...].

Answer

to the geometric average of an overnight rate (or overnight index rate) over every day of the payment period

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An overnight indexed swap (OIS) is an interest rate swap where the periodic floating rate of the swap is equal to the geometric average of an overnight rate (or overnight index rate) over every day of the payment period.

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Overnight indexed swap - Wikipedia, the free encyclopedia
ader:filter:minify-css:7:3904d24a08aa08f6a68dc338f9be277e */ Overnight indexed swap From Wikipedia, the free encyclopedia Jump to: navigation, search An overnight indexed swap (OIS) is an interest rate swap where the periodic floating rate of the swap is equal to the geometric average of an overnight rate (or overnight index rate) over every day of the payment period. The index rate is typically the rate for overnight unsecured lending between banks, for example the Federal funds rate for US dollars, Eonia for Euros or Sonia for sterling. The fixed ra

Flashcard 149627851

Tags

#bonds #duration #finance

Question

DV01 is short for "dollar value of an [...].

Answer

01" (or 1 basis point)

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DV01 is short for "dollar value of an 01" (or 1 basis point).

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Bond duration - Wikipedia, the free encyclopedia
nit change in input (a basis point of yield). Dollar duration or DV01 is the change in price in dollars, not in percentage. It gives the dollar variation in a bond's value per unit change in the yield. It is often measured per 1 basis point - DV01 is short for "dollar value of an 01" (or 1 basis point). The names BPV (basis point value) or PV01 (present value of an 01) are also used, although PV01 more accurately refers to the value of a one dollar or one basis point annuity. (For a par

Annotation 149627868

#java #java8 #lambda-expressions

For anonymous class ‘this’ keyword resolves to anonymous class, whereas for lambda expression ‘this’ keyword resolves to enclosing class where lambda is written.

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Java 8 Lambda Expressions Tutorial. Lambda Expression Java
ist.stream().map(x -> x*x).reduce((x,y) -> x + y).get(); System.out.println(sum); Difference between Lambda Expression and Anonymous classOne key difference between using Anonymous class and Lambda expression is the use of this keyword. For anonymous class ‘this’ keyword resolves to anonymous class, whereas for lambda expression ‘this’ keyword resolves to enclosing class where lambda is written.Another difference between lambda expression and anonymous class is in the way these two are compiled. Java compiler compiles lambda expressions and convert them into private method of t

Annotation 149627875

#java #java8 #lambda-expressions

a Functional Interface is an interface with just one abstract method declared in it.

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Java 8 Lambda Expressions Tutorial. Lambda Expression Java
eturned within the code block, or void if nothing is returned.What are Functional InterfacesIn Java, a Marker interface is an interface with no methods or fields declaration. In simple words, marker interface is an empty interface. Similarly, a Functional Interface is an interface with just one abstract method declared in it.java.lang.Runnable is an example of a Functional Interface. There is only one method void run() declared in Runnable interface. Similarly ActionListener interface is also a Functional In

Annotation 149627892

How lambda expressions work under the hood?

#java #java8 #lambda-expressions

How lambda expressions work under the hood?

It might look like the lambda expressions are just the syntax sugar for anonymous inner classes, but there is much more elegant approach. The simplest explanation is: the lambda expression is represented by a new method, and it is invoked at run-time using invokedynamic.

Source code:

class LambdaExample {

    public void abc() {
        Runnable r = () -> { 
            System.out.println("hello");
        }
        r.run();
    }
    
}

Bytecode equivalent:

class LambdaExample {

    public void abc() {
        Runnable r = <lambda$1 as Runnable instance>;
        r.run(); 
    }

    static void lambda$1() {
        System.out.println("hello");
    }
    
}

Inside the JVM, there is a lambda factory that creates an instance of the functional interface (e.g. Runnable) from the generated lambda method (e.g. lambda$1).

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Java 8 Resources - Introduction to Java 8 Lambda expressions

Annotation 149627912

#horstmann-java8-for-really-impatient #java #java8 #lambda-expressions

You can’t even assign a lambda expression to a variable of type Object—Object is not a functional interface.

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Flashcard 149627919

Tags

#horstmann-java8-for-really-impatient #java #java8 #lambda-expressions

Question

What lambda expression is object::instanceMethod equivalent to?

Answer

(x, y, ...) -> object.instanceMethod(x, y, ....)

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Flashcard 149627946

Tags

#horstmann-java8-for-really-impatient #java #java8 #lambda-expressions

Question

What lambda expression is Math::pow equivalent to?

Answer

(x, y) -> Math.pow(x, y)

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Flashcard 149627965

Tags

#horstmann-java8-for-really-impatient #java #java8 #lambda-expressions

Question

What lambda expression is String::compareToIgnoreCase (careful, it is an instance method) equivalent to?

Answer

(x, y) -> x.compareToIgnoreCase(y)

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Annotation 149627985

#horstmann-java8-for-really-impatient #java #java8 #lambda-expressions

The body of a lambda expression has the same scope as a nested block.

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Flashcard 149627992

Tags

#horstmann-java8-for-really-impatient #java #java8 #lambda-expressions

Question


public class Application() {
  public void doWork() {
    Runnable runner = () -> { ...; System.out.println(this.toString()); ... };
    //...
  }
}

Does this in this.toString() refer to Application or Runnable?

Answer

Application

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Annotation 149628012

#default-methods #horstmann-java8-for-really-impatient #java #java8

If a superclass provides a concrete method, default methods with the same name and parameter types are simply ignored. Superclasses win.

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Annotation 149628028

#default-methods #horstmann-java8-for-really-impatient #java #java8

Interfaces clash. If a superinterface provides a default method, and another interface supplies a method with the same name and parameter types (default or not), then you must resolve the conflict by overriding that method.

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Annotation 149628044

#default-methods #horstmann-java8-for-really-impatient #java #java8

You can never make a default method that redefines one of the methods in the Object class. For example, you can’t define a default method for toString or equals, even though that might be attractive for interfaces such as List. As a consequence of the “classes win” rule, such a method could never win against Object.toString or Object.equals.

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Annotation 149628060

#horstmann-java8-for-really-impatient #java #java8

code to count words where length > 12 in traditional way:


int count = 0;
for (String w : words) {
  if (w.length() > 12) count++;
}

in Java 8 would look like this:


count = words.stream().filter(w -> w.length() > 12).count();

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Annotation 149628076

#horstmann-java8-for-really-impatient #java #java8

to parallelise search for words here:


count = words.stream().filter(w -> w.length() > 12).count();

you would change a method stream() to parallelStream()

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Annotation 149628092

#horstmann-java8-for-really-impatient #java

In Java 8 you can turn any collection into a stream with the stream() from the Collection interface.

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Annotation 149628108

#horstmann-java8-for-really-impatient #java

In Java 8 you can turn any array into a stream with the static Stream.of() method.

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Annotation 149628124

#horstmann-java8-for-really-impatient #java #java8

To generate infinite stream from a stateless function, you use Stream.generate()

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Annotation 149628140

#horstmann-java8-for-really-impatient #java #java8

Stream.iterate() generates an infinite stream from a "seed" (initial value) and then a function repeatedly applied to previous result.

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Annotation 149628156

#horstmann-java8-for-really-impatient #java #java8

The Collections.sort method sorts a collection in place, whereas Stream.sorted returns a new sorted stream.

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Annotation 149628172

#horstmann-java8-for-really-impatient #java #java8

The Optional.flatMap method works in the same way as Stream.flatMap if you consider an optional value to be a stream of size zero or one.

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Article 149628195

#horstmann-java8-for-really-impatient #java #java8 #p26

You may find a flatMap method in classes other than streams. It is a general concept in computer science. Suppose you have a generic type G (such as Stream) and functions f from some type T to G and g from U to G<V>. Then you can compose them, that is, first apply f and then g, by using flatMap. This is a key idea in the theory of monads.

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on 10-Aug-2014 (Sun)

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