857 posts tagged with math.
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Help me model some curves that have a certain time profile.

I've got a bunch of curves that (I hope) show some common profile over time, although they maybe scaled versions of each other: at any index along in the curve >1, the next point is conditional on all (or some) of the previous. See this greatly simplified example. [more inside]
posted by ed\26h on Sep 9, 2014 - 8 answers

2 year old son loves numbers - how can I nurture his talent?

My 2 year old son loves numbers. He can count by himself well into the 50s and can tell you what number he's looking at to at least as high as 110. As for me, well, numbers and I have never been the best of friends. How can I, a numbers-adverse dad, encourage and nurture his talent? [more inside]
posted by Effigy2000 on Sep 6, 2014 - 23 answers

Help with 2D transforms in ellipse drawing algorithm

I'm trying to draw a 3D ellipse with a 2.5D graphics engine (Core Animation layers) which allow me to only compose my ellipse with line segments that must be moved into place using rotations and translations. I'm having trouble with the order of operations and can't get it to draw properly. Any graphics gurus or game programmers out there who can help me? [more inside]
posted by krunk on Sep 1, 2014 - 7 answers

How do you compare profits to loss due to inflation?

I'm trying to compare the compounded losses due to inflation to non-compounded profits. E.g. if inflation makes me lose 3% of an investment each year, what % would I need to profit each year in order to exactly keep up? This is tricky because the profit is not compounded the way inflation is. I'm not looking for an answer to this specific question, but rather, looking for a tool or method to do this kind of math. [more inside]
posted by brenton on Aug 21, 2014 - 12 answers

Statistics Book for an interested teen

My teen aged niece has suddenly found a strong interest in statistics. What book would you recommend for a 14 year old who has good, but not advanced, math skills?
posted by honestcoyote on Aug 15, 2014 - 18 answers

Help! Can I normalize statistical coefficients?

With deadline looming, stats consultant has bailed. Simple queries need resolution. Help? I am working on a data graphic that involves statistical calculations about survival rates for startup businesses, correlated with certain tangible and intangible factors. The raw data (about survival/closure/merger outcomes) has already been investigated, and the original researchers (who are awesome) have generated some interesting correlations using univariate regressions and Cox regressions. For my output I am relying on their statistically significant findings, wanting to create comparisons among the univariate coefficients. Not sure my methods are kosher and would appreciate consultation. Avalanche inside. [more inside]
posted by GrammarMoses on Aug 13, 2014 - 2 answers

Math-related field trip destinations for Bay Area HS students?

I teach math to high schoolers in the San Francisco Bay Area. I'd like to get them out of the classroom on a field trip to a local math-themed destination. Any suggestions? [more inside]
posted by aws17576 on Aug 12, 2014 - 11 answers

Methods of approximation?

I've never been very good at either math or at eyeballing things like weight or dimension, but was thinking recently about how to more or less accurately weigh things without using a scale. What good methods are out there to approximate other kinds of measurements? [more inside]
posted by OverlappingElvis on Aug 12, 2014 - 11 answers

Which algorithms changed the world?

A recent post to the blue proposed a set of equations that changed the word. As a computer professional, I'm curious, which algorithms transformed the world? [more inside]
posted by pwnguin on Aug 10, 2014 - 23 answers

Math Camp for Economist help!

I'm basically teaching myself how to do pass an PhD economics placement test, and I'm looking for resources to learn these things that aren't books. [more inside]
posted by MisantropicPainforest on Aug 10, 2014 - 5 answers

What are inter-disciplinary and atypical uses for math MSc?

I have just completed my MSc in mathematics in Europe. I do enjoy math, but I spent my uni years feeling like a autodidact hippie marooned on an island full of Mr and Mrs I-Want-A-Good-Job. My main interests revolve around humanities (literature/history/anthropology) and economics (but not finance), and instead of starting a "stable" well-paying career I dream about something inter-disciplinary. I am very open to earning little money and relocating just to do kind of work that engages those skills. What are some random uses of my degree? [more inside]
posted by desultory_banyan on Jul 28, 2014 - 12 answers

4x+y+2z=100, x>y, y>z, x+y+z=j, 3x+z=k, j>k, j+k=100.

4x+y+2z=100, x>y, y>z, x+y+z=j, 3x+z=k, j>k, j+k=100. WolframAlpha can only give me alternative forms or a solution involving 'real and imaginary parts of z'. Is there a solution I can count on my fingers? [more inside]
posted by obiwanwasabi on Jul 22, 2014 - 13 answers

Math Careers

Non-obvious careers for someone with a B.S. in Applied Mathematics? [more inside]
posted by anonymous on Jul 22, 2014 - 21 answers

Math? College?

The best way to pursue my college goals given my situation. [more inside]
posted by mrdrummed on Jul 20, 2014 - 12 answers

Calculus Rabbit?

Is there a game like Math Rabbit out there, but for calculus? Specifically looking for something with lots of game-interface, not Khan Academy.
posted by curious nu on Jul 20, 2014 - 1 answer

what percent will result from combining two types of milk?

If I add 1/100 to 2/100, I get 3/100 or 3%. But if I add one hundred apples, one of which is red, to one hundred apples, two of which are red, I will have 3/200 or 1.5%. I'm very confused now as to what percent milk fat my milk will be if I combine the two types of milk (1% and 2%) together.
posted by windykites on Jul 16, 2014 - 15 answers

Converting math to code

Wanting to code. Can't read calculus. Kinda stuck. Help? [more inside]
posted by ericc on Jul 3, 2014 - 11 answers

Math Filter: What is Calculus?

My son would like to know: Is there more to calculus than functions, examples of functions, various formats for presenting functions, and so on? That is, does calculus have unique to it other tools that are not just variations on functions? [more inside]
posted by Michele in California on Jul 3, 2014 - 32 answers

Math book recommendations?

Years ago I read John Derbyshire's Prime Obsession: Bernhard Riemann and the Greatest Unsolved Problem in Mathematics and loved it. Now I'm studying formal theory/real analysis and I'm finding it really it interesting, but would like to be able to spend my downtime reading about the background of math and also explains some of the concepts. Thanks!
posted by MisantropicPainforest on Jun 24, 2014 - 13 answers

Maximum sum of numbers, one from each set, with constraints

Working on a personal project, I am running into a number of math problems of the kind described within. I am not a math expert, so I don't know what to call these kinds of problems, so I don't know how to search for information about them. [more inside]
posted by moonroof on Jun 23, 2014 - 11 answers

Help Me Learn Math!

I will be returning to school in the fall to start prerequisite courses for a Physical Therapy program. I don't know math. The last time i took math was in high school, and it was basic geometry. I would like to teach myself primarily, so that i can test into higher classes. The goal is to be able to test into pre-calc, so that i can also qualify for the physics classes as well. Any suggestions? I don't really care about the method. I was thinking about buying a textbook, but i was unsure of which ones to get. Thanks.
posted by hiddenknives on Jun 14, 2014 - 13 answers

Help Building a Gameplan For a Career In Market Research Analysis

So, I’ve been doing a lot of thinking about how to land a career in market research analysis. Below are the steps I’ve laid out for myself. Could you tell me if this is a good game plan to get where I want to go? [more inside]
posted by ggp88 on Jun 12, 2014 - 5 answers

Can you answer this question before my traffic court at 9 am?

I'm due in traffic court at 9 am. Help me use math to prove I didn't do it. [more inside]
posted by anastasiav on Jun 10, 2014 - 15 answers

2 problems of combinations and permutations.

How many unique ways are there to put X rocks into Y boxes? (Given two different sets of attributes for both the rocks and the boxes.) [more inside]
posted by CustooFintel on Jun 4, 2014 - 18 answers

Mortgage shenanigans?

We have an excessive interest rate on our home. We tried to refi, and the appraisal came in a good $40,000 less than it needed to in order to qualify. So some of our more numerically-talented friends ran some numbers for us in an attempt to find alternative solutions and found a weird discrepancy that makes it appear we owe $15,000 more on the loan than we do... [more inside]
posted by bitter-girl.com on May 13, 2014 - 13 answers

Pythagorean Theorem in the original Greek

I'm looking for a textual version of a2 + b2 = c2 that is as old as possible, among all the Greek sources. [more inside]
posted by benito.strauss on May 12, 2014 - 5 answers

How do I calculate combined percentages?

Mathfail: I'm considering supplementing my cat's food with plain meat. I'd like a rough idea of how much it would bump percentage of calories from protein and fat. [more inside]
posted by moira on May 10, 2014 - 6 answers

Should my math student have some Unix skills?

I think my son, who is on an AP math trajectory in high school, would benefit from getting some familiarity and basic programming skills in the Unix world. I've noticed math depts in some universities include study of these skills in early years. Are there some tutorials we could use in the OS X environment to get a leg up? [more inside]
posted by Mei's lost sandal on May 5, 2014 - 17 answers

What Major and Career Should I Look At If I Enjoy Math?

In studying for my Behavioral Statistics final (it’s a statistics class dealing with psychology research methods) I’ve realized something. I actually kind of enjoy math. As long as I don’t have to memorize formulas (as long as they are right there as I’m going through the work) it’s actually kind of comforting and fun. In fact, every math class I’ve taken in college (I’ve taken two remedial algebras, college algebra, and regular statistics before this class) I’ve enjoyed and made an A in. I’m really struggling about what I want to major in (I’m in psychology but I don’t have it in the gas tank to get a PhD), but I know that a lot of people don’t like math. They don’t get it. I do, so I’ve got something there, right? The only problem is, I don’t know what to do with it. These are the parameters… maybe you can think of something that fits? [more inside]
posted by ggp88 on May 4, 2014 - 16 answers

Size of earth to solar system vs drop of water to Mt Everest?

Can someone please tell me (if you could show calculations, that would be wonderful) what the ratio of ratios would be for these two numbers: a) the volume of the earth compared to that of the solar system and b) the volume of a drop of water compared to that of Mount Everest?
posted by shivohum on Apr 25, 2014 - 9 answers

Why is the center of a circle often given as (h, k)?

Why are the letters 'h' and 'k' often used to represent the center of a circle in the standard equation of a circle: (x - h)2 + (y - k)2 = r2 are 'h' and 'k' short for something? I might guess 'h' is short for 'horizontal', but I can't imagine what 'k' is for. [more inside]
posted by Reverend John on Apr 17, 2014 - 16 answers

What's a good topic for a one-hour math lecture?

I work as a math tutor at a community college and have the opportunity to spend an hour teaching math to a group of students preparing for a the college's math placement test. Now, I don't know what's on the placement test, but I want to teach something that's more engaging and conceptually accessible than "here's how to multiply (4x+3)(2x+5)", since I can't possibly review all of high-school math in an hour and don't think the students will get much from just another lecture. What are some interesting topics that I can explore that will be accessible and memorable?
posted by LSK on Apr 10, 2014 - 21 answers

Article about Common Core math

Trying to find an article I read sometime in the last three months about Common Core math. [more inside]
posted by Questolicious on Apr 5, 2014 - 7 answers

[MathFilter] Taking for-credit math classes online

For professional and academic reasons, I need to take a number of college-level math classes (mainly Calculus and Linear Algebra) in a relatively short period of time (4-6 months). They need to be online, for-credit, and I need to be able to do them at my own pace, meaning faster than a normal 1-course-per-semester flow. I've already found https://netmath.illinois.edu/, but the classes are terribly expensive, so I'd like to learn of other alternatives that don't cost as much.
posted by dcrocha on Apr 4, 2014 - 6 answers

Von Neumann I am not

I’ve spent my 20s building a BS “identity” as an “analytical type of person". Help me grow up. Snowflakes inside. [more inside]
posted by anonymous on Mar 29, 2014 - 10 answers

Calculus after being away from algebra for some time. Help me.

I am going to grad school in the fall. Hooray! Problem: I have to take calculus before I start and I am kind of freaking out. [more inside]
posted by The Pantless Wonder on Mar 24, 2014 - 24 answers

Chance of event with small sample size, based on larger related sample?

Can/how can one improve the estimate for a chance of an event with a small historical sample size by utilizing the chance of a related event with a large historical sample size? Example and half-assed guess inside. [more inside]
posted by Flunkie on Mar 20, 2014 - 16 answers

You Can't Handle the (Next) Proof!

Working through Apostol's Calculus Volume I for personal development. Stuck on a proof, again. Can you help? [more inside]
posted by bfranklin on Mar 18, 2014 - 6 answers

How to take scientific notes efficiently?

What is the best way to take grad level notes that feature tons of text, math equations and diagrams, during class, while reading books, and while reading research? Ability to search and organize a huge plus! Digital or non-digital solutions considered. [more inside]
posted by Riton on Mar 18, 2014 - 13 answers

In Need an Nerdy T-Shirt for Tomorrow (3.141592654...)

Okay, I'm in NYC and I need a PI related T-Shirt for Pi-Daytomorrow... Anyone know of any stores where I can get one? (It's too late for an online order)
posted by Stu-Pendous on Mar 13, 2014 - 11 answers

Why do we have order of operations in arithmetic?

Why do we have order of operations rules in arithmetic instead of just strictly evaluating expressions from left to right (possibly with parenthesis for grouping if we really wanted to change the order)?
posted by Reverend John on Mar 11, 2014 - 9 answers

Is this science or a sort of engineering? How do I learn more about it?

My ignorance of science and engineering concepts, procedures, and methods of calculation is holding me back from tackling a whole mess of fun stuff. But what fields am I even interested in, and how can I learn more? Where do I begin? [more inside]
posted by rue72 on Mar 4, 2014 - 11 answers

Well-written math

Which mathematicians write exceptionally well or exceptionally clearly? (Individual books or articles would also be acceptable.) [more inside]
posted by hoyland on Feb 28, 2014 - 19 answers

Where can I take an online linear algebra course this summer?

I have $800 for tuition reimbursement, and would like to take a linear algebra online course this summer. It doesn't matter if its for credit or not. Thanks!
posted by MisantropicPainforest on Feb 23, 2014 - 5 answers

Regarding the M in STEM

What are some of the newest methods being used these days to teach young children arithmetic? [more inside]
posted by Dansaman on Feb 10, 2014 - 3 answers

Was Fifth Grade math always this hard?

Can you show us how to solve a math word problem? [more inside]
posted by uncaken on Jan 28, 2014 - 27 answers

Singapore Math

I'm trying to help my 3rd grader with his math homework, but we are stuck on one problem. I can solve it using Algebra, but I'm trying to figure out how to explain it to him using the Singapore method that he's taught in school. Note that he hasn't learned how to add negative numbers, which puts a crimp on the methodology. [more inside]
posted by agog on Jan 27, 2014 - 7 answers

You Can't Handle the Proof!

Working through Apostol's Calculus Volume I for personal development. Stuck on a proof. Can you help? [more inside]
posted by bfranklin on Jan 25, 2014 - 7 answers

Table top brainteaser puzzles

Where can I find more good ideas for brainteaser puzzles like these? [more inside]
posted by klausman on Jan 17, 2014 - 3 answers

Why can't I differentiate this nomal/Guassian distrubution?

Have a look here. I'm assured that differentiating 1, with respect to x, gets you 2. Now 2 is - I think, and correct me if I'm wrong - equivalent to 3. The problem is I can't see how 3 is the result of differentiating 1. What's more, an online solver produces something (that looks) very different. Can someone help me out?
posted by ed\26h on Jan 17, 2014 - 9 answers

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