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authorRinat M <mukhometzyanov@mail.ru>2020-02-27 14:58:17 -0500
committerGitHub <noreply@github.com>2020-02-27 14:58:17 -0500
commit390354b6f203235b5638c1a63cca5f7e64a4e8f5 (patch)
tree7e5a6f2ffd81769179dbb1f9853cc6c404dad9b8 /asymptotic-notation.html.markdown
parent9c6084c33edb3dcfd2105ac8ad1a36ed0d375209 (diff)
Some grammar, vocabulary, stylistic changes
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@@ -31,24 +31,24 @@ specifications, processing power, etc.
## Types of Asymptotic Notation
-In the first section of this doc we described how an Asymptotic Notation
+In the first section of this doc, we described how an Asymptotic Notation
identifies the behavior of an algorithm as the input size changes. Let us
imagine an algorithm as a function f, n as the input size, and f(n) being
the running time. So for a given algorithm f, with input size n you get
-some resultant run time f(n). This results in a graph where the Y axis is the
-runtime, X axis is the input size, and plot points are the resultants of the
-amount of time for a given input size.
+some resultant run time f(n). This results in a graph where the Y-axis is
+the runtime, the X-axis is the input size, and plot points are the resultants
+of the amount of time for a given input size.
You can label a function, or algorithm, with an Asymptotic Notation in many
different ways. Some examples are, you can describe an algorithm by its best
-case, worse case, or equivalent case. The most common is to analyze an
-algorithm by its worst case. You typically don't evaluate by best case because
-those conditions aren't what you're planning for. A very good example of this
-is sorting algorithms; specifically, adding elements to a tree structure. Best
-case for most algorithms could be as low as a single operation. However, in
-most cases, the element you're adding will need to be sorted appropriately
-through the tree, which could mean examining an entire branch. This is the
-worst case, and this is what we plan for.
+case, worst case, or average case. The most common is to analyze an algorithm
+by its worst case. You typically don’t evaluate by best case because those
+conditions aren’t what you’re planning for. An excellent example of this is
+sorting algorithms; particularly, adding elements to a tree structure. The
+best case for most algorithms could be as low as a single operation. However,
+in most cases, the element you’re adding needs to be sorted appropriately
+through the tree, which could mean examining an entire branch. This is
+the worst case, and this is what we plan for.
### Types of functions, limits, and simplification
@@ -61,20 +61,22 @@ constant
Exponential Function - a^n, where a is some constant
```
-These are some basic function growth classifications used in various
-notations. The list starts at the slowest growing function (logarithmic,
-fastest execution time) and goes on to the fastest growing (exponential,
-slowest execution time). Notice that as 'n', or the input, increases in each
-of those functions, the result clearly increases much quicker in quadratic,
-polynomial, and exponential, compared to logarithmic and linear.
-
-One extremely important note is that for the notations about to be discussed
-you should do your best to use simplest terms. This means to disregard
-constants, and lower order terms, because as the input size (or n in our f(n)
-example) increases to infinity (mathematical limits), the lower order terms
-and constants are of little to no importance. That being said, if you have
-constants that are 2^9001, or some other ridiculous, unimaginable amount,
-realize that simplifying will skew your notation accuracy.
+These are some fundamental function growth classifications used in
+various notations. The list starts at the slowest growing function
+(logarithmic, fastest execution time) and goes on to the fastest
+growing (exponential, slowest execution time). Notice that as ‘n’
+or the input, increases in each of those functions, the result
+increases much quicker in quadratic, polynomial, and exponential,
+compared to logarithmic and linear.
+
+It is worth noting that for the notations about to be discussed,
+you should do your best to use the simplest terms. This means to
+disregard constants, and lower order terms, because as the input
+size (or n in our f(n) example) increases to infinity (mathematical
+limits), the lower order terms and constants are of little to no
+importance. That being said, if you have constants that are 2^9001,
+or some other ridiculous, unimaginable amount, realize that
+simplifying skew your notation accuracy.
Since we want simplest form, lets modify our table a bit...
@@ -89,7 +91,7 @@ Exponential - a^n, where a is some constant
### Big-O
Big-O, commonly written as **O**, is an Asymptotic Notation for the worst
case, or ceiling of growth for a given function. It provides us with an
-_**asymptotic upper bound**_ for the growth rate of runtime of an algorithm.
+_**asymptotic upper bound**_ for the growth rate of the runtime of an algorithm.
Say `f(n)` is your algorithm runtime, and `g(n)` is an arbitrary time
complexity you are trying to relate to your algorithm. `f(n)` is O(g(n)), if
for some real constants c (c > 0) and n<sub>0</sub>, `f(n)` <= `c g(n)` for every input size
@@ -139,7 +141,7 @@ No, there isn't. `f(n)` is NOT O(g(n)).
### Big-Omega
Big-Omega, commonly written as **Ω**, is an Asymptotic Notation for the best
case, or a floor growth rate for a given function. It provides us with an
-_**asymptotic lower bound**_ for the growth rate of runtime of an algorithm.
+_**asymptotic lower bound**_ for the growth rate of the runtime of an algorithm.
`f(n)` is Ω(g(n)), if for some real constants c (c > 0) and n<sub>0</sub> (n<sub>0</sub> > 0), `f(n)` is >= `c g(n)`
for every input size n (n > n<sub>0</sub>).
@@ -188,8 +190,8 @@ _**asymptotically tight bound**_ on the growth rate of runtime of an algorithm.
Feel free to head over to additional resources for examples on this. Big-O
is the primary notation use for general algorithm time complexity.
-### Ending Notes
-It's hard to keep this kind of topic short, and you should definitely go
+### Endnotes
+It's hard to keep this kind of topic short, and you should go
through the books and online resources listed. They go into much greater depth
with definitions and examples. More where x='Algorithms & Data Structures' is
on its way; we'll have a doc up on analyzing actual code examples soon.