111 total contributions since 2012

Professional Interests: geodesy

Solved

Generate a NaN...on purpose

The goal is to create a function that will return a single "NaN" without using the nan function. I am interested to see how many...

7 years ago

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Derivative of polynomial

Compute the derivative of a given polynomial. The input is an <http://www.mathworks.com/help/matlab/math/representing-polynomial...

7 years ago

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CONVERT TAN TO SIN

In a right angle triangle ABC given the tan(A) then find sin(A) For example tan(A)=3/4 then sin(A)=3/5

7 years ago

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Special matrix

Make a square matrix with this shape. For n=4 M = 1 1 0 0 1 0 1 0 0 1 0 ...

7 years ago

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Finding peaks

Find the peak values in the signal. The peak value is defined as the local maxima. For example, x= [1 12 3 2 7 0 3 1 19 7]; ...

7 years ago

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Return the first and last character of a string

Return the first and last character of a string, concatenated together. If there is only one character in the string, the functi...

8 years ago

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Cell joiner

You are given a cell array of strings and a string delimiter. You need to produce one string which is composed of each string fr...

8 years ago

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The Dark Side of the Die

It is well-known that opposite sides of a classic hexahedral die add to 7. Given a vector of dice rolls, calculate the sum of th...

8 years ago

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Next Higher Power of B

|Given a number _n_ and a base _B_ greater than 1, return the lowest integer power of _B_ that is greater than or equal to _n_. ...

8 years ago

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Next Lower Power of B

Given a number _n_ and a base _B_ greater than 1, return the lowest integer power of _B_ that is less than or equal to _n_. E...

8 years ago

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Television Screen Dimensions

Given a width to height ratio of a TV screen given as _w_ and _h_ as well as the diagonal length of the television _l_, return t...

8 years ago

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Multiples of a Number in a Given Range

Given an integer factor _f_ and a range defined by _xlow_ and _xhigh_ inclusive, return a vector of the multiples of _f_ that fa...

8 years ago

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Guess Cipher

Guess the formula to transform strings as follows: 'Hello World!' --> 'Ifmmp Xpsme!' 'Can I help you?' --> 'Dbo J ifmq zpv...

8 years ago

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Make a diamond

Given n, odd number > 1, return n by n matrix consist of "null" and "*" characters arranged like a diamond. No toolbox funct...

8 years ago

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Make a 1 hot vector

Make a vector of length _N_ that consists of all zeros except at index _k_, where it has the value 1. Example: Input ...

8 years ago

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Add two numbers

Calculate the sum of two numbers. Example input = [2 3] output = 5

8 years ago

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Determine if input is a perfect number

A <http://en.wikipedia.org/wiki/Perfect_number/ perfect number> occurs whent the sum of all divisors of a positive integer, exce...

8 years ago

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Doubling elements in a vector

Given the vector A, return B in which all numbers in A are doubling. So for: A = [ 1 5 8 ] then B = [ 1 1 5 ...

8 years ago

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Divisors of an integer

Given a number N, return a vector V of all integers that divide N. For example, N = 10 Then V=[1 2 5 10]

8 years ago

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Cell Counting: How Many Draws?

You are given a cell array containing information about a number of soccer games. Each cell contains one of the following: * ...

8 years ago

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Generate a string like abbcccddddeeeee

This is the string version of Problem 1035. <http://www.mathworks.com/matlabcentral/cody/problems/1035-generate-a-vector-like-1-...

8 years ago

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Find Index of maximum Value and maximum Value of a vector

Find the Index of the first occurrence of the maximum value in a vector and also the maximum value in the vector. Example: [...

8 years ago

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Generate a vector like 1,2,2,3,3,3,4,4,4,4

Generate a vector like 1,2,2,3,3,3,4,4,4,4 So if n = 3, then return [1 2 2 3 3 3] And if n = 5, then return [1 2 2...

8 years ago

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Change the sign of even index entries of the reversed vector

change the signs of the even index entries of the reversed vector example 1 vec = [4 -1 -2 9] ans = [9 2 -1 -4] example2...

8 years ago

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Project Euler: Problem 6, Natural numbers, squares and sums.

The sum of the squares of the first ten natural numbers is, 1^2 + 2^2 + ... + 10^2 = 385 The square of the sum of the first ...

8 years ago

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"mirror" matrix

Create n x 2n "mirror" matrix of this type: e.g. for n = 2 m = [1 2 2 1;1 2 2 1] e.g. for n = 3 m = [1 2 3 3 2 1...

8 years ago

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Getting logical indexes

This is a basic MATLAB operation. It is for instructional purposes. --- Logical indexing works like this. thresh = 4...

8 years ago

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Check if number exists in vector

Return 1 if number _a_ exists in vector _b_ otherwise return 0. a = 3; b = [1,2,4]; Returns 0. a = 3; b = [1,...

8 years ago