Posts Tagged ‘graphs’

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Math Joke 2: Nick Cave’s Mo is a Parabola

February 22, 2019

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Who would have thought, mathspigs, that there was so much maths in hair.

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Today’s post looks at the Majestic Moustache or the Manly Mo and moustache graphs.

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Here are Mathspig’s two favourite moustache graphs.

First, is the Moustache and the Decline of the British-Empire or 100-Year Itch @ TWC, which includes a pictorial record of the moustaches decline.

The second graph is from the American Mustache Institute* showing the decline in corporate reputation with the decline in the popularity of the mo with PR professionals.

THESE ARE HILARIOUS GRAPHS, but they are Gaga or Made Up Graphs.

How does Mathspig know this?

Because of the numbers.  The Y-axis scale is missing or irrelevant to the graphs shown.

These graphs are a bit of fun, but graphs are used to sell you products and some graphs can be totally misleading.

See Graphs for the Lost and Bewildered

Mathspig, promised you Manly Mo Maths. And there is Maths in MOs.

Nick Cave’s Mo is a Parabola.

John Travolta’s Mo is also a parabola.

The Village People all parabola MOs.

Captain Jack Sparrow’s

 beard is ∏ !!!!

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THIS IS A TOM SELLECK FRACTAL.

Goodness me, it’s a Tom Selleck  Eyebrow Mo Sierpinski Gasket

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MAKE YOUR OWN MANLY MO:

Not all MOs are real and Groucho Marx trade mark eyebrows & mo were painted on.

Why not get your own Manly Mo.

Or, mathspig teachers,  get your class to draw ‘parabolas’ on their hands and if a member of staff has a mo invite him into the maths class then on the count of three show him the whole class of ‘parabolas’

*If you love that moustache talk here is an American Mustache Institute Interview:

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Hair Maths 1: The curly problem with curly hair

May 6, 2015

pic 0 mathspig hair maths 2

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pic 1 Mathspig the curly Q

More about Troy’s $million hair here. Hair statistics including how many hairs a human has on their head here.

Mathspig studied hair chemistry at uni. Tricky stuff. Put simply, hair is made of long strands of protein called keratin held together by sulphur (and some hydrogen) bonds. To curl hair, the keratin strands in the outer curve of each hair has to be stretched with curling tongs or hair curlers, heated and dried. The bonds in each hair reform with one side longer than the other … Hence, the hair curls like gift-wrap ribbon. But high humidity allows hair to reabsorb water and straightened hair just goes psycho curly again!

pic 2 mathspig Hair PermThis excellent hair diagram comes from The Chemistry of Shampoo and Conditioner, in an article by EMMA Dux for the Royal Australian Chemical Institute

Some people are born with hair follicles that produce keratin at different rates across the follicle. They have curly hair. Hair perms chemically break and reform the sulphur bonds while the hair is held in small curlers (curly hair) or a very big curlers(relatively straight hair.) thus permanently curling the hair.

Here’s the Maths:

Curly hair looks like a 3D Helix.

pic 3 Helix Graph and Equation MathspigMore on 3D helix maths here

But, in fact, one strand of curled hair looks more like a spiral staircase.

The outer edge of the staircase is longer than the inner edge.

pic 5 HELIX spiral staircase

 pic 6 formula for curly hair

 More helix maths here.

CHALLENGE:

Mathspig doesn’t expect Middle School students to plot a 3D Helix. But if they have started TRIGONOMETRY then they can see that the maths they are studying is used in CGIs for films and computer games in this case to generate realistic curly hair!!!! That’s cool. This maths was needed to model Merida’s curly hair in  BRAVE.

pic 7 Merida's Curly hair

SMARTY PANTS CHALLENGE:

Some middle school students could calculate some points on the helix.

Now students must be introduced to radians.

Simple EXPLANATION: Angles eg. 300 are not useful in calculations but fractions are very useful.

Eg. The circumference of a circle:

C = 2πr

Now imagine if you scan with a floodlight set at a radius of 1 km. So:

C = 2π

So the circumference is 2π.

You scan ¼ of a circle, the distance the light moves is ¼(2π)

or ½ π or 1.57 km (see below)

This measurement of an angle is in RADIANS.

00     = 0 circle = 0

450   = 1/8 circle = 2π/ 8 = 2 (3.14) /8 = 0. 79

900   = 1/4 circle = ½ π = ½ (3.14) = 1.57

1350   = 3/8 circle = ¾ π = ¾ (3.14) = 2.36

1800= 1/2 circle = π = 3.14

2250   = 5/8 circle = 5/4 π = 5/4(3.14) = 3.93

2700 = 3/4 circle = 3/2 π = 4.71

3150   = 7/8 circle = 7/4 π = 7/4 (3.14) = 5.50

3600 = 1 circle = 2π = 6.28

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You will find Cos  tables at NASA Sine tables at Mathhelp

 Mathspig 3D helix table

Answer here: Answers- 3D Helix Table

 Advanced students may want to look at what the Uber Geek 3D Helix generating program at the free graph website PLOTLY here.

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Hair Maths 2: Why CGI needs maths

May 6, 2015

Pic 0 mathspig hair maths 2a

 The challenge is to make CGI hair look real. This isn’t easy. Some CGI hair doesn’t need maths because it doesn’t move. Some CGI is just ugly. Eg.

pic 1 world's Worst CGI hair

More from the worst video game hair cuts ever here and here.

In the world of CGI hair, curly hair is the challenge. It is difficult to model.

According to Pixar animators:

Hair curls due to the way it is grown. Curly hair is almost like a ribbon, while straight hair is more tubular.

(Mike Seymour,Brave New Hair Fxguide)

pic 7 brave  hair

 You will find detailed maths used by Pixar to model Merida’s hair here.

pic 8 Merida's Hair Graphics

So straight hair swishes and curly hair springs or bobs.

pic 9 Ariel-the-little-mermaid

Ariel, the Little Mermaid, was meant to have curly hair, but animators stuck with a ‘flowing block’ of hair. Before Ariel Disney Princess often had up-dos.

pic 10 disney pricess dilemaProgress was made with Merida’s hair in the Disney/Pixar animation BRAVE. See BRAVE NEW HAIR WIRED and fxguide.

According to Rachel Gross of Wired Magazine in 2009 Chung’s team designed a new simulator named Taz, after the wild Looney Tunes character. It forms individual coils around computer-generated cylinders of varying lengths and diameters. The resulting locks stretch out when Merida runs but snap back into place as soon as she stops. Add a little randomness, some gravity, and more than 1,500 hand-placed corkscrews and flyaway wisps and voilà: hair with depth and texture viewers have never seen before. The result may look wild, but it’s not. “It’s very stylized, very controlled,” Chung says. No hair spray required.

Rachel Newar explained last year in the Scientific American that physicists have modeled the movement of a single curly hair.

pic 11 graph of single strand

But, co-author Pedro Reis, an assistant professor of mechanical engineering and of civil and environmental engineering at MIT noted. “ the geometry of a curly hair is highly nonlinear— a word we often use for something complicated.”

The model could also calculate curvature of steel pipes or other spooled material. “We were engineers trying to solve practical, useful problems from the start,” Reis says. “I’m not a professional hairstylist—I’m bald, actually.”

More @ Mashable Video here.

And, from Stanford, if you’ve ever been curious this is what a curly hair algorithm looks like ie. It is a computer program for curling graphic hair.

So you don’t have to eat your crusts after all.

What were mothers thinking!!!!

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Why you have to watch those tricky economists!!!!!

July 29, 2009

holdworld_tns  MATHS IN THE REAL WORLD

which is everywhere!!!! log graph 2 Correction

Economists may not set out to mislead the public, but they do produce graphs that can easily be misread. Here is a graph from AMP (again) published in THE  AUSTRALIAN  on 29/7/09 (p12 . Wealth supplement.).

Have a look at the graph. What’s wrong with it?????????????

Mathspig Maths Mystery Box 1 graphFirstly, you cannot invest money in 1928. To be relevant to you, start looking at the graph when you first had money to invest. 1999? 2008?

Secondly, look at the Y-axis scale. This is NOT a LINEAR graph. This is a logarithmic scale. That little blip drop in Australian Shares value at the end is worth $331,375!!!!!  If you had $1,000,000 (Just retired, for instance) and put your money in shares in October 2007 that is how much money you would have LOST.

Here is a liner graph showing clearly (and more honestly) the drop in the All Ordinaries Index in the Australian Share Market during the GFC. The graph came from Sharewatch.

Mathspig Maths Mystery Box 1 graph 2