# Raphael Cautain

### IRIC@UdeM

Mathematics and Computer Science for friends in Biology, Astronomy, Telecoms, Defence who needs Algorithmics, Objects, Data Processing.

Professional Interests: Signal processing, biology

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**Content Feed**

Question

Ensure the syntax is what we guess

It would be nice to publish (as in Old School Languages) a syntax summary of Matlab, reflecting the exact behaviour of the inte...

mer än 9 år ago | 1 answer | 2

### 1

answerWhat is missing from MATLAB?

Missing : The assignment is not yet a functional operator : a = (b = exp1) + (c = exp2); % could give to a the value (exp1+ex...

mer än 9 år ago | 0

Solved

ranch area?

Your friend has a ranch with four distinct boundary lines. Three boundary lines are ideal straight roads: (1) North Club Road, (...

nästan 10 år ago

Solved

Is this matrix orthogonal?

Given a square matrix, a, determine whether it is orthogonal. INPUT: a, a n x n matrix OUTPUT: true or false

nästan 10 år ago

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Generalized sorting

Write generalized sort function |sortg()| that sorts array elements in “ascending” order with given comparison funct...

nästan 10 år ago

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Convert a numerical matrix into a cell array of strings

Given a numerical matrix, output a *cell array of string*. For example: if input = 1:3 output is {'1','2','3'} whic...

nästan 10 år ago

Solved

Clock Hand Angle 1

Given a time in HH:MM:SS, find the smallest angle (in degrees) between the hour and minute hand

nästan 10 år ago

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Column norms of a matrix

Given a matrix M, return a vector y such that for each k y(k)=norm(M(:,k)) (y(k) is the Euclidean norm of the k-th col...

nästan 10 år ago

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Covering area

As an extension of the problem <http://www.mathworks.com/matlabcentral/cody/problems/416-polygon-area>, find the area, bounded b...

nästan 10 år ago

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Return the Fibonacci Sequence

Write a code which returns the Fibonacci Sequence such that the largest value in the sequence is less than the input integer N. ...

nästan 10 år ago

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Find indices of multiple minima in a vector

I have a vector, say: x= [ 1 5 6 2 6 1 3 5 1] Now I would like to get the index of the minimum values in this vector. When...

nästan 10 år ago

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count any radix?

given radix r(2-9), digts d(1-4), give all possible strings in sorted order. for example, if r=2, d=2, then output {'00' '01' '1...

nästan 10 år ago

Solved

Pythagorean perfect squares: find the square of the hypotenuse and the length of the other side

Given the square root of a square number, *seed*, and a range, *n*, find the square number, *Z* as well as the other side, *y*, ...

nästan 10 år ago

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Looking for Squares

Need n squares that equal one square all together, none zero, none fractured. For example, calling squares(2) should output [16...

nästan 10 år ago

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love is an n-letter word

Given a list of *N words*, return the *N-letter word* (choosing one letter from each word) with the property of having the least...

nästan 10 år ago

Solved

Numbers with prime factors 2, 3 and 5.

Make a function which takes one positive integer n and returns a matrix with the numbers of the form (2^i)*(3^j)*(5^k) which are...

nästan 10 år ago

Solved

chance in percent for minimum K heads when a good coin is tossed N times?

For example, chance is 100% for minimum 0 heads when a coin is tossed 7 times. Chance is 50% for minimum 2 heads when a coin is...

nästan 10 år ago

Solved

Project Euler: Problem 16, Sums of Digits of Powers of Two

2^15 = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26. What is the sum of the digits of the number 2^N? Thanks ...

nästan 10 år ago

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Great Circle Distance

Find shortest between two points on a ball given their azimuthal and polar angles (in degrees) as well as the radius of the sphe...

nästan 10 år ago

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Specific Element Count

Given a vector _v_ and a element _e_, return the number of occurrences of _e_ in _v_. Note: NaNs are equal and there may be n...

nästan 10 år ago

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Project Euler: Problem 3, Largest prime factor

The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number being input, input might be ui...

nästan 10 år ago

Solved

Fizz Buzz

Given an array of positive, non-zero, integers, return a cell array of strings the same size as the input, where each element in...

nästan 10 år ago

Solved

Filter values in a vector

Cody often benefits from a functional style of programming. For example, your score is often better when you compose multiple fu...

nästan 10 år ago

Solved

Double Deal

*Description* Given an input vector _v_, return the first element as the first output, the second element as the second outpu...

nästan 10 år ago

Solved

Figurate number triangle

Check whether the input matrix is a figurate number triangle: <http://mathworld.wolfram.com/FigurateNumberTriangle.html>

nästan 10 år ago

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peta to nano (x-ray)

for certain x-ray radiation, given frequency in petahertz, give wavelength in nanometer, must be accurate +/- 25%

nästan 10 år ago

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Back to basics 12 - Input Arguments

Covering some basic topics I haven't seen elsewhere on Cody. Return a value equal to the number of input arguments to the fun...

nästan 10 år ago

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Back to basics 10 - Max Float

Covering some basic topics I haven't seen elsewhere on Cody. Return the largest positive floating-point number MATLAB can han...

nästan 10 år ago

Solved

Circumscribed circles

Given the lengths of the 3 sides of a triangle, output the radius of the circumscribed circle. Example: [3 4 5] -> 2.5

nästan 10 år ago

Solved

Tricky timing

Write a function that takes between 0.5 seconds and 0.6 seconds to run.

nästan 10 år ago