I have a MSc in physics from the University of Oslo and a PhD in control engineering from NTNU in Trondheim (mainly modelling, I am not much of a control engineer). My main interests are mathematical modelling, numerical methods, and thermodynamics. I worked in the petroleum and chemical process industries for some 35 years and I am now semi-retired

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Under the sea: Snell's law & total internal reflection

<https://en.wikipedia.org/wiki/Snell's_law> When a light travels from one medium to another medium, depending on the refracti...

circa 19 ore ago

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Find the sides of an isosceles triangle when given its area and height from its base to apex

Find the sides of an isosceles triangle when given its area and the height from its base to apex. For example, with A=12 and ...

circa 19 ore ago

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Regular polygon bounded by and bounding a circle

As the number of sides (or vertices) of a regular polygon goes to infinity, its perimeter and area go to the perimeter and area ...

circa 19 ore ago

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Angle bisectors

Given 2 direction vectors, calculate the *_two_ (2) normalized angle bisectors* (which are perpendicular between them). Input...

circa 19 ore ago

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Euclidean distance from a point to a polynomial

A not uncommon problem in the area of computational geometry is to find the closest point to a straight line from a given point,...

circa 21 ore ago

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Fun with a compass

Each night for the past week, you have been having the same nightmare: You find yourself back in your junior high school geometr...

1 giorno ago

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Conic equation

A conic of revolution (around the |z| axis) can be defined by the equation s^2 – 2*R*z + (k+1)*z^2 = 0 where |s^2=x^2+y...

2 giorni ago

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Radiation Heat Transfer — View Factors (5)

View factors (aka configuration factors) are utilized in some radiation heat transfer models to estimate heat transfer rates bet...

3 giorni ago

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Why the heck are they blinking!?!?

Merry Christmas everyone! Sadly, the lights you've had on your tree for so many years burned out, and it's time to get a new se...

3 giorni ago

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Pancakes for everyone!

Accordingly to the <http://nl.mathworks.com/matlabcentral/cody/problems/42460-the-cake-is-a-lie problem 42460>. All the children...

7 giorni ago

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The cake is a lie...

You're hosting a birthday party with a large number of screaming children. Fortunately, you have a gigantic sheet cake in front...

8 giorni ago

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Radiation Heat Transfer — View Factors (4)

View factors (aka configuration factors) are utilized in some radiation heat transfer models to estimate heat transfer rates bet...

9 giorni ago

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Height of a right-angled triangle

Given numbers a, b and c, find the height of the right angled triangle with sides a and b and hypotenuse c, for the base c. If a...

9 giorni ago

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Placing Beads Neatly in a Box

You are given a string of n black and white beads. Your job is to pack them neatly into a square box. "Neatly" in this case mean...

10 giorni ago

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Convex Hull Capture

Imagine four points in uv that form a square. uv = [ ... 0,0; 0,2; 2,2; 2,0]; Now we have two more po...

15 giorni ago

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Find the sines of an isosceles triangle when given its area and height

Find the sines of an isosceles triangle when given its area and height. For example, when A=60 and h=5, the result is [0.3752...

15 giorni ago

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solid of revolution

Given an real polynomial P and two real numbers a,b with 0<=a<=b. Calculate the volume of the solid of revolution made by rota...

15 giorni ago

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Minimal cost

A power house, P, is on one bank of a straight river W meters wide, and a factory, F, is on the opposite bank L meters downstr...

15 giorni ago

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Valid Chess Moves

Using <http://en.wikipedia.org/wiki/Algebraic_chess_notation standard Algebraic notation> ('' for a pawn), given previous move a...

16 giorni ago

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Extract Built In Functions and Toolbox Functions from String or Function Handle

Find the Built-In functions and Toolbox functions in either a string or a function handle. Generate a string of alphabetized ...

16 giorni ago

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QWERTY coordinates

Given a lowercase letter or a digit as input, return the row where that letter appears on a <http://en.wikipedia.org/wiki/Keyboa...

17 giorni ago

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Word Distance - Sum

Let's suppose that the distance of a word can be calculated by summing the differences between its letters, having assigned the ...

17 giorni ago

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Draw 'B'

Draw a x-by-x matrix 'B' using 1 and 0. (x is odd and bigger than 4) Example: x=5 ans= [1 1 1 1 0 1 0 0 0 1 ...

18 giorni ago

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~~~~~~~ WAVE ~~~~~~~~~

|The WAVE generator| Once upon a time there was a river. 'Sum' was passing by the river. He saw the water of the river that w...

18 giorni ago

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Remove the air bubbles

Given a matrix a, return a matrix b in which all the zeros have "bubbled" to the top. That is, any zeros in a given column shoul...

18 giorni ago

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For loop assistance- incorrect data

You give DATA.s(3,1) the desired value in line 8 of exec2w. Then you overwrite it with the wrong value in line 22. I found deb...

For loop assistance- incorrect data

You give DATA.s(3,1) the desired value in line 8 of exec2w. Then you overwrite it with the wrong value in line 22. I found deb...

18 giorni ago | 0

Answered

How can resolve r0<=r0_max?

I interpret your question to mean that you want copertura{mm,nn}(k,1) to take the value 1 if r0{mm,nn}(k,1) <= r0_max(mm,nn), an...

How can resolve r0<=r0_max?

I interpret your question to mean that you want copertura{mm,nn}(k,1) to take the value 1 if r0{mm,nn}(k,1) <= r0_max(mm,nn), an...

21 giorni ago | 0

Submitted

Nonlinear equation system solver: broyden

Solve set of nonlinear equations. Optionally define bounds on independent variables.

27 giorni ago | 32 downloads |

Submitted

Fast solver for nonlinear equation systems: newton.m

Solves a system f(x) = 0 with n equations in n variables

28 giorni ago | 9 downloads |

Submitted

Thermodynamic models and tools for H2O, H2, CO2 and Air

Tool for effective thermodynamic calculations. Includes high-accuracy thermodynamic models for H2O, H2 CO2 and Air.

circa un mese ago | 17 downloads |