# William

Semi-retired physicist with interests in numerical modeling and mathematics.

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**Content Feed**

Solved

Sub-Diagonal Sum

Given a (m x n) matrix and a value r {1,-1}, change every element to the sum of the diagonal led by the element. r=1 > regular ...

ongeveer 5 uur ago

Solved

Easy Sequences 75: Easy as Pisano Pi

Pisano period , of an integer , is the period in which the sequence of Fibonacci numbers modulo repeats. For example it is not ...

ongeveer 6 uur ago

Solved

Dog Statistics

The vectors ht and wt contains the heights and weights of 20 golden retrievers. In some cases, it was not possible to make both ...

ongeveer 16 uur ago

Solved

Calculating Student Grades

The matrix grades contains raw grades for 7 students who took your course. Each row represents a different student. The first 7 ...

ongeveer 17 uur ago

Solved

Matrix Quadrants

Write a function that takes N as the input, and outputs a matrix whose upper-left (NxN) quadrant contains all ones, the lower-ri...

ongeveer 18 uur ago

Solved

Find Closest Constant

Given a number x, return the value that is closest to x from this list of constants: 0, 1, , e, , (also known as ). For exampl...

ongeveer 18 uur ago

Solved

Calculate the mean of each half of a matrix

Given a matrix with an even number of columns, n, return a 1-by-2 row vector where the first element is the mean of all the elem...

ongeveer 19 uur ago

Solved

Create an arrow matrix

An arrow matrix is a square matrix that contains ones on the diagonal, the last column, and last row. ...

ongeveer 19 uur ago

Solved

Find the minimum of the column-maximums of a matrix

Given a matrix A, find the maximum value of each column, then return the smallest of those maximum values (ie return the minimum...

ongeveer 19 uur ago

Solved

Simpson's Paradox - Calculate correlation coefficients for groups of data

Simpson's Paradox is a statistical phenomenon where groups of data can have a characteristic while the whole data set together h...

ongeveer 19 uur ago

Solved

Determine if x is a combination of m and n

Given positive integers x, m, and n, determine if x can be written as x = am + bn for any (non-negative) integers a and b. Your ...

ongeveer 19 uur ago

Solved

Split up vector or matrix delimited by NaNs

Given several vectors contained within one vector delimited by NaNs, return each individual vector as an element of a cell vecto...

1 dag ago

Solved

Measure the hydraulic conductivity with a falling-head permeameter

A falling-head permeameter is another device for measuring the hydraulic conductivity of a soil sample. In this problem the sam...

3 dagen ago

Solved

Amicable pair

Amicable numbers are two different numbers such that the sum of the proper divisors of each is equal to the other number. For e...

4 dagen ago

Solved

Number of leaps in binary search

Binary search is one of the most popular searching algorithms (Binary Search Algorithm). It works only in a sorted array. It uti...

4 dagen ago

Solved

Find the moving-average of the elements of a vector

Example Input vector: [1 2 3 4] output vector: 1st element=1/1, 2nd element=(1+2)/2, 3rd element=(1+2+3)/3, 4th element=(1+2...

4 dagen ago

Solved

Ordinary Annuity : Future Value

Theorem : Future Value of an Ordinary Annuity where; F : Future value A : Periodic payment r : Rate per period n : Numbe...

4 dagen ago

Solved

Ordinary Annuity : Rate (Future Value)

Theorem : Future Value of an Ordinary Annuity where; F : Future value A : Periodic payment r : Rate per period n : Numbe...

4 dagen ago

Solved

Ordinary Annuity : Rate (Present Value)

Theorem : Present Value of an Ordinary Annuity where; P : Present value of all payments A : Periodic payment r : Interest ...

4 dagen ago

Solved

Compound Interest: Interest Rate

Theorem : Compound Interest where, F : Future value at the end of n periods P : Present value r : Annual nominal rate n :...

5 dagen ago

Solved

Simple Interest : Calculate Future Value

Theorem : Simple Interest where; F : Future Value P : Present Value r : Annual simple interest rate (decimal) t : Time in...

5 dagen ago

Solved

Simple Interest : Calculate Present Value

Theorem : Simple Interest where; F : Future Value P : Present Value r : Annual simple interest rate (decimal) t : Time in...

5 dagen ago

Solved

Simple Interest : Calculate annual simple interest rate

Theorem : Simple Interest where; F : Future Value P : Present Value r : Annual simple interest rate (decimal) t : Time in...

5 dagen ago

Solved

Simple Interest : Calculate time in years

Theorem : Simple Interest where; F : Future Value P : Present Value r : Annual simple interest rate (decimal) t : Time in...

5 dagen ago

Solved

Compound Interest : Future Value

Theorem : Compound Interest where, F : Future value at the end of n periods P : Present value r : Annual nominal rate n :...

5 dagen ago

Solved

Compound Interest: Present Value

Theorem : Compound Interest where, F : Future value at the end of n periods P : Present value r : Annual nominal rate n :...

5 dagen ago

Solved

Compound Interest : Compounding Periods

Theorem : Compound Interest where, F : Future value at the end of n periods P : Present value r : Annual nominal rate n :...

5 dagen ago

Solved

Ordinary Annuity : Periodic Payments (Future Value)

Theorem : Future Value of an Ordinary Annuity where; F : Future value A : Periodic payment r : Rate per period n : Numbe...

5 dagen ago

Solved

Ordinary Annuity : Number of payments (Future Value)

Theorem : Future Value of an Ordinary Annuity where; F : Future value A : Periodic payment r : Rate per period n : Numbe...

5 dagen ago

Solved

Ordinary Annuity : Present Value

Theorem : Present Value of an Ordinary Annuity where; P : Present value of all payments a : Periodic payment r : Interest ...

5 dagen ago