hashtag mathematica symbol

Mathematica notebooks are structured interactive documents that are organized into a sequence of cells. What is the meaning of prepended double colon “::”? Root basically represents the rootNumberth root of the equation: Root[ PolynomialAsPureFunction, rootNumber ]. Here’s how to type a hash on a Mac keyboard. What LEGO piece is this arc with ball joint? It only takes a minute to sign up. Mathematica is a registered trademark of Wolfram Research, Inc. What are the most common pitfalls awaiting new users? How to write an effective developer resume: Advice from a hiring manager, “Question closed” notifications experiment results and graduation, MAINTENANCE WARNING: Possible downtime early morning Dec 2/4/9 UTC (8:30PM…. But it does know what is its numerical value: In[7]:= N@Root[-1 - 2 #1 - #1^2 + 2 #1^3 + #1^4 &, 1] Out[7]= -2.13224 So, Root[f,k] is a kind of stenographic writing for roots of polynomials with order > 3. But, in the 1980s, people started using hash to refer to the # symbol. That is important for pairing & and # when you have nested functions. What is the preferred syntax for defining enums in JavaScript? This creates a delayed set, that any time a value is passed into a symbol reference f as a functional parameter, that value will be given a local context function-specific name of x (not affecting the global definition of x, if there is one). Copy editors see a symbol meaning “space,” as in “add a space between two sentences.” In computer code, the # symbol means that everything that follows is only comment, not instruction. On Twitter, Facebook, and Instagram, you tag your friends with the @ symbol and you tag topics with the #. Another coin weighing puzzle, now including shifty coins! Did Star Trek ever tackle slavery as a theme in one of its episodes? According to one report, Bell Lab employee Don MacPherson named it after the Olympian Jim Thorpe. What happened next is not entirely clear. Podcast 289: React, jQuery, Vue: what’s your favorite flavor of vanilla JS? Do These Words Best Describe A Sagittarius? When writing “lb,” scribes often crossed the letters with a line across the top, like a t. 2: The number sign. Can I run my 40 Amp Range Stove partially on a 30 Amp generator. How to consider rude(?) One will be used when one parameter is sent, and another when 2 parameters are sent. Root objects are used to represent complex numbers and can be calculated to the required precision: If you apply Re, Im and Abs to a Root-object a new Root-object is generated automatically: Knowing that Root-objects can contain parameters they work perfectly together with other Mathematica functions: site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. So, (someValue + 5) becomes (#+5)&, where & says "I'm a pure function, and will work with whatever you send me", and # says "I'm the parameter (or a parameter list) that was sent to the pure function". Making statements based on opinion; back them up with references or personal experience. Stack Overflow for Teams is a private, secure spot for you and Or maybe easier: 1) Highlight 2) Press F1 3) Profit ? This phrase arose in Britain because pound sign could easily be confused with the British currency. Since the # symbol didn’t have a name, the technicians thought one up. Hold Alt and type the number below using the numeric pad on your keyboard to insert mathematics symbols. The brackets on the right indicate the extent of each cell. Without them and the "b" (although it is slanted) that is used to symbolize a flat, that is how you define the key that the music is written in. Some times you just need a quick function and do not need to define it and leave it hanging. Why does ++[[]][+[]]+[+[]] return the string “10”? NumLock needs to be enabled. It's just the first root of the polynomial. Tutorial for Mathematica & Wolfram Language. ALT 128 – ALT 255 produces special characters and symbols from Code Page 437 that are composed of extended characters which include international text or accented letters (diacritics), some Greek letters, line-drawing (box-drawing) symbols, mathematical symbols and miscellaneous symbols. Then what does Root[-1 - 2 #1 - #1^2 + 2 #1^3 + #1^4 &, 1] exactly mean? How can I make the seasons change faster in order to shorten the length of a calendar year on it? You’ll see the hash symbol above the number 3 key on your keyboard. The Deep Web vs. Dear Soufiane, thanks. Since the ascent of social media and its new prominence in everyday life, hashtag has become the favored name. Each branch of mathematics has its own special symbols that represent a … . Use natural-language input or function formatting. What does the “at” (@) symbol do in Python? It's just the first root of the polynomial. My function is a simple polynomial: Now I tried to find T as a function of Tn, for which I used Solve: Plotting it is no problem, which I did by using this: But the problem is that I have no idea what the hashtags in the result of Solve denote, and how I should write the function T(Tn). If you have a function operating on two vars, you could do: Or you may have a function operating in a list, so: So, if your poly is x^2 - 1, using what we saw above: But if we try with a higher order polynomial: That means Mathematica doesn't know how to caculate a symbolic result. your coworkers to find and share information. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Utter the word mathematics and even grown ups are known to shudder at the mere mention of it! And of course, the # symbol is sometimes spoken as the word “number,” as in “#2 pencil.”. Many people, particularly Americans, call the hash symbol “pound” because it was formed from lb, the acronym of pound and a unit of weight common in the United States. Why did MacOS Classic choose the colon as a path separator? Hash itself is a relatively new word and is just one of the many names of the pound sign. Are there temporal limits to data requirements for a GDPR SAR? But it does know what is its numerical value: So, Root[f,k] is a kind of stenographic writing for roots of polynomials with order > 3. Windows ALT codes based on Windows Code Page 1252 How would sailing be affected if seas had actually dangerous large animals? [duplicate]. “Cost” vs. “Price”: How Much Is The Difference? The word hash predates these other names (but wasn’t very popular until recently). How to find out what any built-in syntax means in Mathematica: Notation # is (as stated above) used to mean "a variable goes here" in a pure function ("closure" for you traditional developers). What does “use strict” do in JavaScript, and what is the reasoning behind it? That means Mathematica doesn't know how to caculate a symbolic result. The term “hashtag” was nonexistent at the time he made that tweet. What Do The Most Well-Known Website Names Mean? There is a function that I'm trying to get the inverse of. Can it be justified that an economic contraction of 11.3% is "the largest fall for more than 300 years"? If you have multiple arguments #1, #2, #3... refer to the first, second, third argument and so on. “Grieve” vs. “Bereave”: What Is The Difference? 3: The hashtag. This name came to be because the symbol comes from the abbreviation for weight, lb, or libra pondo, literally “pound by weight,” in Latin. The above command then becomes: You can chain @ as such: Reverse@Sort@DeleteDuplicates[...]. A typical Mathematica notebook containing text, graphics and Mathematica expressions. Why is the concept of injective functions difficult for my students? Another former employee claims it was a nonsense word, meant as a joke. While the mark is used herein with the limited permission of Wolfram Research, Stack Exchange and this site disclaim all affiliation therewith. Is Elastigirl's body shape her natural shape, or did she choose it. “Drinking Fountain” vs. “Water Fountain” vs. “Bubbler”: Are They Synonyms? This field is for validation purposes and should be left unchanged. Why use "the" in "than the 3.5bn years ago"? Be sure to pay close attention to the pattern of capital and lower case letters used in symbol names. Example of multi-parameter pure function in common use: Let's say mydata is a list of lists, which you need to sort by median of the lists (e.g. For example, Mathematica recognizes Sumas the symbol representing the sum function, but does not recognize sumas the sum function. Such a small symbol with such a vast amount of meaning . Where Did The Strange Expression “Hair Of The Dog” Come From? Maybe we should include synonyms in, What do the hashtags represent in the result of Solve, and how should I use them? In sequence models, is it possible to have training batches with different timesteps each to reduce the required padding per input sequence? Which Turkey Came First: The Bird Or The Nation? Another unverifiable report is much more etymologically satisfying: The Old Norse word thorpe meant “farm or field,” so octothorpe literally means “eight fields.”. Using public key cryptography with multiple recipients.

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