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MD · A blog

Blog of Matthew Daws. Random sampling to see a percentage of a population. Given a population and sampling at random ( with replacement ) what’s the expected number of samples I need to see 50% (or any fixed proportion) of the population. And so . By convention, . Then, if I want to see exactly members, the time needed is . We can estimate the expectation by an integral, [ mathbb E(S n) approx vert P vert int { vert P vert-n} { vert P vert 1} frac 1 x dx = vert P vert log Big( frac{ vert P vert 1}{ v...

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MD · A blog | matthewdaws.github.io Reviews
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Blog of Matthew Daws. Random sampling to see a percentage of a population. Given a population and sampling at random ( with replacement ) what’s the expected number of samples I need to see 50% (or any fixed proportion) of the population. And so . By convention, . Then, if I want to see exactly members, the time needed is . We can estimate the expectation by an integral, [ mathbb E(S n) approx vert P vert int { vert P vert-n} { vert P vert 1} frac 1 x dx = vert P vert log Big( frac{ vert P vert 1}{ v...
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1 all posts
2 articles
3 book reviews
4 mathematical work
5 some generative art
6 random sampling
7 graphs in windsor
8 raii in c#/java
9 unique ptr
10 shared ptr
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MD · A blog | matthewdaws.github.io Reviews

https://matthewdaws.github.io

Blog of Matthew Daws. Random sampling to see a percentage of a population. Given a population and sampling at random ( with replacement ) what’s the expected number of samples I need to see 50% (or any fixed proportion) of the population. And so . By convention, . Then, if I want to see exactly members, the time needed is . We can estimate the expectation by an integral, [ mathbb E(S n) approx vert P vert int { vert P vert-n} { vert P vert 1} frac 1 x dx = vert P vert log Big( frac{ vert P vert 1}{ v...

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matthewdaws.github.io matthewdaws.github.io
1

BF interpreter in C++ · MD

http://matthewdaws.github.io/BF.html

Blog of Matthew Daws. BF interpreter in C. BF is an amusingly named, impractical, Turing complete. Programming language. It is very like an actual Turing machine: you have an infinite (originally, one-sided, 30K long) array of (8-bit) values, with commands to increase/decrease ( /-) the cell, or move left/right ( / ). Input (,) and output (.) are handled. Loops are given by [] and implement a while cell is non-zero loop. So a trivial mapping to C is possible (see the Wikipedia article). To store input an...

2

Generative Art

http://matthewdaws.github.io/old_art/index.html

Some rendered generative art. Some old (old) images, but what can't be improved by a fancy website? These image are built using:. Generate (2D) images from a stochastic grammar. Essentially a 3D version of the above. See also Mikael Hvidtfeldt Christensen's fantastic blog Syntopia. Old, but fun, JAVA based raytracer. As admissions tutor, I helped produce the artwork for three of our brochures. The first is a Structure Synth and Sunflow render; the second two are from Context Free. Source code part 2.

3

Random sampling to see a percentage of a population. · MD

http://matthewdaws.github.io/Sampling.html

Blog of Matthew Daws. Random sampling to see a percentage of a population. Given a population and sampling at random ( with replacement ) what’s the expected number of samples I need to see 50% (or any fixed proportion) of the population. And so . By convention, . Then, if I want to see exactly members, the time needed is . We can estimate the expectation by an integral, [ mathbb E(S n) approx vert P vert int { vert P vert-n} { vert P vert 1} frac 1 x dx = vert P vert log Big( frac{ vert P vert 1}{ v...

4

RAII in C#/Java? · MD

http://matthewdaws.github.io/RAII-In-C.html

Blog of Matthew Daws. More a note to a future self than aything else In C we have the notion of Resource Acquisition Is Initialization. Which I think I have internalised as the following:. Any resource (memory, file, handle etc.) should be owned by an object. An object’s constructor should allocate the resource, and the destructor should free the resource (with some appropriate choices then made for what copy/move constructors/assignments should do). By use of C 11. This model can be extended to pointers.

5

MD · A blog

http://matthewdaws.github.io/page2

Blog of Matthew Daws. CodeJam 2015 Round 2. Round 2 came and went (and Round 3 and the distributed round). As an effort to practice with C#, I solved these problems in C# (definitely slower than using Python, and actually, the end running time is not that much quicker, for these sort of algorithmic / numerical problems). There’s a definite step-up in difficulty here! See the code on GitHub. Problem A, Pegman:. So check each direction:. Does it point out of the grid? If so, count it, and. However, even in...

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Talking | Simple City

https://richardelwes.co.uk/talking-maths

Richard Elwes's Blog and Website. Book: Chaotic Fishponds…. Book: How to Build a Brain. Book: Maths in 100 Key Breakthroughs. Book: The Maths Handbook. Who is Richard Elwes? I love talking about maths. Please get in touch (r [dot] elwes [at] gmail [dot] com) if you would like me to come and speak to your school or club. The sessions I currently offer include:. Interactive masterclass – I have versions of this suitable for beginners and for more advanced (e.g. A-level) students. Royal Institution Scottish...

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MD · A blog

Blog of Matthew Daws. Random sampling to see a percentage of a population. Given a population and sampling at random ( with replacement ) what’s the expected number of samples I need to see 50% (or any fixed proportion) of the population. And so . By convention, . Then, if I want to see exactly members, the time needed is . We can estimate the expectation by an integral, [ mathbb E(S n) approx vert P vert int { vert P vert-n} { vert P vert 1} frac 1 x dx = vert P vert log Big( frac{ vert P vert 1}{ v...

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