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Saved by uncleflo on February 24th, 2019.
When sailors are talking about their boats they often refer to ratios and numbers. That´s a tendency in human behaviour to try to generalize things to make them comparable. Of course, everybody knows that you cannot really describe apple to pears and so it´s worthless to describe a let´s say Seventies IOR-era King´s Cruiser 33 like mine to a modern day cruising yacht but we nevertheless tend to do so. The Displacement-Length-Ratio in general is a non-dimensional number. It sets into relation the displacement of a boat (expressed in pounds) to the length of her waterline (in feet). So, in general, this ratio is looking for the relation between the (heavy?) volume of water being pushed aside by a boat´s hull and the length (and therefore speed potential see for my article Hull speed vs. Froude number here) of her hull. Sounds fair enough?
seaworthy froude mainsail bounce comfort generalize displacement waterline dimensional ratio yacht calculation boat basics sail compare cruiser hull sailing comparable sailor guess calculate design sailingboat behaviour volume length potential sound create build math mathematics marine
Saved by uncleflo on January 4th, 2019.
As an entrepreneur, one of the most important tasks you can perform is getting your idea(s) out from your head into a tangible format so that you can communicate that with others. In the past, this usually meant a well-researched business plan, that would usually take weeks (more like months) to create. I turn to the Lean Canvas to help me quickly formulate possible business models, product launches, campaigns and variations of, and communicate this with my stakeholders for my Lead Flow Method work. Having the Lean Canvas as a visual guide made this part “communicating the model/idea” so much more effective — and I think the most valuable function of the tool. The problem with business plans for startups & entrepreneurs are that they’re a waste of time, don’t get me wrong a well-researched business plan is important but only at the right stage of your business (usually when you’re in growth/investment). This quote from Steve Blank sums up this point in case: “Business Plan: a document investors make you write, that they don’t read”. The key fundamental to Lean methodology is the elimination of waste — this includes time, processes, inventory and more. So as a lean startup you need a quicker way to get ideas out of your head, you need to stay lean & avoid waste — so, it’s time to introduce Lean Canvas.
lean optimist canvas startup unfair funnel formulate recommend quicker insider validation blank communicating proposition customer entrepreneur pricing calculate communicate invest advantage solving methodology business money return howto analysis analytical guide method waste research important model launch variation document investor tool process inventory quick idea communication pitch poster start
Saved by uncleflo on December 23rd, 2018.
In the previous chapter, we explored in depth what we mean by the tidy text format and showed how this format can be used to approach questions about word frequency. This allowed us to analyze which words are used most frequently in documents and to compare documents, but now let’s investigate a different topic. Let’s address the topic of opinion mining or sentiment analysis. When human readers approach a text, we use our understanding of the emotional intent of words to infer whether a section of text is positive or negative, or perhaps characterized by some other more nuanced emotion like surprise or disgust. We can use the tools of text mining to approach the emotional content of text programmatically, as shown in Figure 2.1.
tidy sentiment normalize toolbox sentiments analyze calculate words analysis development code ruby developer howto technical book demonstration frequency lingual language emotional approach investigate compare keyword useful web
Saved by uncleflo on December 23rd, 2018.
A central question in text mining and natural language processing is how to quantify what a document is about. Can we do this by looking at the words that make up the document? One measure of how important a word may be is its term frequency (tf), how frequently a word occurs in a document. There are words in a document, however, that occur many times but may not be important; in English, these are probably words like “the”, “is”, “of”, and so forth. We might take the approach of adding words like these to a list of stop words and removing them before analysis, but it is possible that some of these words might be more important in some documents than others. A list of stop words is not a sophisticated approach to adjusting term frequency for commonly used words. Another approach is to look at a term’s inverse document frequency (idf), which decreases the weight for commonly used words and increases the weight for words that are not used very much in a collection of documents. This can be combined with term frequency to calculate a term’s tf-idf, the frequency of a term adjusted for how rarely it is used. It is intended to measure how important a word is to a document in a collection (or corpus) of documents. It is a rule-of-thumb or heuristic quantity; while it has proved useful in text mining, search engines, etc., its theoretical foundations are considered less than firm by information theory experts.
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Saved by uncleflo on December 23rd, 2018.
If I ask you “Do you remember the article about electrons in NY Times?” there’s a better chance you will remember it than if I asked you “Do you remember the article about electrons in the Physics books?”. Here’s why: an article about electrons in NY Times is far less common than in a collection of physics books. It is less likely to stumble upon the “electron” concept in NY Times than in a physics book. Let’s consider now the scenario of a single article. Suppose you read an article and you’re asked to rank the concepts found in the article by importance. The chances are you’ll basically order the concepts by frequency. The reason is simply that important stuff would be mentioned repeatedly because the narrative gravitates around them. Combining the 2 insights, given a term, a document and a collection of documents we can loosely say that:importance ~ appearances(term, document) / count(documents containing term in collection).
python classifier compute implement compile calculate corpus classify phrases extraction compare advise keyword technical development howto suggestion article frequency analysis tf-idf importance administration
Saved by uncleflo on April 2nd, 2015.
Calculate the Jacobian from a website, very powerful. Many of users do not use powerful Maxima computer algebra system for systematic work, but for ad hoc algebraic calculations – equations, functions, matrixes, etc. only. To do this job, it is not useful to download the whole application from a web site.
Saved by uncleflo on March 26th, 2015.
This page presents a variety of calculations for latitude/longitude points, with the formulæ and code fragments for implementing them. All these formulæ are for calculations on the basis of a spherical earth (ignoring ellipsoidal effects) – which is accurate enough* for most purposes.
Saved by uncleflo on February 8th, 2015.
Here's a summary on how to create a shared and a static library with gcc. The goal is to show the basic steps. I do not want to go into the hairy details. It should be possible to use this page as a reference.
Saved by uncleflo on January 20th, 2015.
How do I calculate the eigenvalue and eigenvector of a matrix on the TI-89 family, TI-92 Plus, and Voyage 200 graphing calculators? To calculate the eigenvalue and eigenvector of a matrix on the TI-89 family, TI-92 Plus, and Voyage 200 refer to the instructions below
Saved by uncleflo on September 2nd, 2014.
Resources, Tools and Basic Information for Engineering and Design of Technical Applications! This great website is a great lookup site for formulas and calculations used in the engineering world. Second Moment of Area or Area Moment of Inertia. Moment of Inertia of an Area, Area Moment of Inertia, also known as Second Moment of Area - I, is a property of shape that is used to predict deflection, bending and stress in beams.
engineering area strength pipe moment mechanical inertia cylinder calculator design calculate mathematics control great website beam distance calculation math mathematical MITx edx 2.01x elements of structures element structure lookup reference
Saved by uncleflo on June 3rd, 2014.
FoilSim - Student was developed at the NASA Glenn Research Center in an effort to foster hands-on, inquiry-based learning in science and math. FoilSim is interactive simulation software that determines the airflow around various shapes of airfoils. The Airfoil View Panel (shown below) is a simulated view of a wing being tested in a wind tunnel with air moving past it from left to right. Students change the position and shape of the wing by moving slider controls that vary the parameters of airspeed, altitude, angle of attack, thickness and curvature of the airfoil, and size of the wing area. The software displays plots of pressure or airspeed above and below the airfoil surface. A probe monitors air conditions (speed and pressure) at a particular point on or close to the surface of the airfoil. The software calculates the lift of the airfoils, allowing students to learn the factors that influence lift. The software includes a stall model for the airfoil and a model of the Martian atmosphere for lift comparisons. The latest version (FoilSim III - Version 1.4b) performs a table look-up of experimental data to determine the drag of the foil. A technical paper describing the details of the mathematical method used in FoilSim is also available.
Saved by uncleflo on February 23rd, 2014.
We know that reactive loads such as inductors and capacitors dissipate zero power, yet the fact that they drop voltage and draw current gives the deceptive impression that they actually do dissipate power. This “phantom power” is called reactive power, and it is measured in a unit called Volt-Amps-Reactive (VAR), rather than watts. The mathematical symbol for reactive power is (unfortunately) the capital letter Q. The actual amount of power being used, or dissipated, in a circuit is called true power, and it is measured in watts (symbolized by the capital letter P, as always). The combination of reactive power and true power is called apparent power, and it is the product of a circuit's voltage and current, without reference to phase angle. Apparent power is measured in the unit of Volt-Amps (VA) and is symbolized by the capital letter S.
Saved by uncleflo on February 8th, 2014.
Ah yes, magnitude and phase. You probably never actually have to bother calculating them explicitly now, seeing as Matlab and Octave will do it for you.
Saved by uncleflo on May 8th, 2013.
This post is aimed mostly at people who are already familiar with Bitcoin (Wikipedia page), and would like to get started using their GPU(s) to mine for bitcoins in a Windows environment. Just some quick terminology: miner = program which is external to bitcoin-qt.exe that uses your graphics card to perform calculations; your GPU is much more efficient at the type of calculations bitcoin does than your CPU
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