You can see the following two code lines produce the same result: > reduce(lambda a, x: a + 3. You can change these however you need.įor example, if I wanted to solve: Σ π*i^2įor a sequence I, I could do the following: reduce(lambda a, x: a + 3.14*x*x, +) The sequence we are summing is represented by the iterable. The formula to the right of the sigma is represented by the lambda. Greek Letters, gamma Gamma, oO, delta Delta, E epsilon varepsilon E, P Z zeta Z sigma, H eta H, T. The current value in the iterable is set to x and added to the accumulator. The accumulator is a and is set to the first value ( 0), and then the current sum following that. Reduce() will take arguments of a callable and an iterable, and return one value as specified by the callable. Result = reduce(lambda a, x: a + x, +list(range(1,3+1))) You can use the following: from functools import reduce Sum(0.75 ** i for i, si in enumerate(parts))Īn efficient way to do this in Python is to use reduce(). Sum(0.75 ** i * si for i, si in enumerate(parts)) The head will thus always determine at least 25% of the speedįor example, suppose the shell has a Composite Head (speed modifierġ.6), a Solid Warhead Body (speed modifier 1.3), and a Supercavitationįrom the example we can see that i starts from 0 not the usual 1 and so we can do def speed_coefficient(parts): Weighted average of the speed modifiers s i of the (non-Ĭasing) parts, where each component i starting at the head has half the In Python, sum will take the sum of a range, and you can write the expression as a comprehension:Ī factor in muzzle velocity is the speed coefficient, which is a Characters from the ASCII character set can be used directly, with a few exceptions (e.g.Captial sigma (Σ) applies the expression after it to all members of a range and then sums the results. LaTeX The LaTeX command that creates the icon. Articles with usage Examples of Wikipedia articles in which the symbol is used. Different possible applications are listed separately. Letters here stand as a placeholder for numbers, variables or complex expressions. Usage An exemplary use of the symbol in a formula. If there are several typographic variants, only one of the variants is shown. Symbol The symbol as it is represented by LaTeX. The following information is provided for each mathematical symbol: In different cases, subscripts and superscripts are used with this symbol as you know. Further information on the symbols and their meaning can also be found in the respective linked articles. In latex, there is a sigma command for the sigma symbol. Some symbols have a different meaning depending on the context and appear accordingly several times in the list. It is divided by areas of mathematics and grouped within sub-regions. The following list is largely limited to non-alphanumeric characters. Many of the characters are standardized, for example in DIN 1302 General mathematical symbols or DIN EN ISO 80000-2 Quantities and units – Part 2: Mathematical signs for science and technology. As it is impossible to know if a complete list existing today of all symbols used in history is a representation of all ever used in history, as this would necessitate knowing if extant records are of all usages, only those symbols which occur often in mathematics or mathematics education are included. The following list of mathematical symbols by subject features a selection of the most common symbols used in modern mathematical notation within formulas, grouped by mathematical topic. It has been suggested that this article be merged into Glossary of mathematical symbols.
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