# Jiawei Gong

### Penn State Behrend

Assistant Professor of Mechanical Engineering

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How many digits are there?

Input(s) - any string Output(n) - number of digits within string s

3 years ago

Solved

Convert Two Character String into a Binary Vector

Given a string "XOXXO" convert it into a binary vector. [1 0 1 1 0] Paul Berglund implemented an optimal method in <http://ww...

3 years ago

Solved

Count letters occurence in text, specific to words with a given length.

Build a function with two input arguments: a string and a word length (number of letters), that outputs a vector of counts of th...

3 years ago

Solved

Is the paranthesis sequence balanced ?

Quantum mechanics and computer science are interested in <http://en.wikipedia.org/wiki/Bra%E2%80%93ket_notation bra-kets>. Today...

3 years ago

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Join Strings with Multiple Different Delimiters

The idea is to form the string S by interleaving the elements of a cell array of strings DELIMITER and another cell array of st...

3 years ago

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Simple Decoder Ring

The stereotypical _decoder ring_ is remembered as a cereal box prize from the 1950s. Kids learned about cryptography by startin...

3 years ago

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Morse Code Generator! Try it!

.... . .-.. .-.. --- . ...- . .-. -.-- --- -. . -.-.-- .-.. . - ... -.. --- ... --- -- . -- --...

3 years ago

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Eliminate Polysyllabics: Long live short words!

Given a string s1, return s2 in which all the words with more than one syllable have been removed. To make things simple, we ...

3 years ago

Solved

Mersenne Primes vs. All Primes

A Mersenne prime (M) is a prime number of the form M = 2^p - 1, where p is another prime number. <https://www.mathworks.com/matl...

3 years ago

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Approximation of Pi (vector inputs)

Pi (divided by 4) can be approximated by the following infinite series: pi/4 = 1 - 1/3 + 1/5 - 1/7 + ... For a given numbe...

3 years ago

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geometric progression

I've modified my <http://uk.mathworks.com/matlabcentral/cody/problems/2800-arithmetic-progression previous program> so that it n...

3 years ago

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arithmetic progression

I've written a program to generate the first few terms of <https://en.wikipedia.org/wiki/Arithmetic_progression arithmetic progr...

3 years ago

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Largest Geometric Series

Extension of Ned Gulley's wonderful <http://www.mathworks.com/matlabcentral/cody/problems/317 Problem 317>. In a geometric se...

3 years ago

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Find similar sequences

Another problem inspired by a question on the <http://www.mathworks.com/matlabcentral/answers answers> forum. Given a matrix ...

3 years ago

Solved

Generate Square Wave

Generate a square wave of desired length, number of complete cycles and duty cycle. Here, duty cycle is defined as the fraction ...

3 years ago

Solved

Sum of series III

What is the sum of the following sequence: Σ(2k-1)^3 for k=1...n for different n?

3 years ago

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Create a block diagonal matrix

A block diagonal matrix is a square matrix that can be written as A = [a 0 0 0 0 b 0 0 0 0 c 0 ...

3 years ago

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Toeplitz Matrix

For a given square matrix of order n-by-n check whether this is a Toeplitz matrix or not. Return true if it is.

3 years ago

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The Matrix Construction

Given two input ,first one is CN (Column Number), Second one is Dim Can you produce such a matrix for example CN=6; Dim=2 ...

3 years ago

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Diagonal of a Spiral Matrix

Write a function that will return same output as diag(spiral(n)). The only exception is that spiral and diag functions are not a...

3 years ago

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Calendar Matrix

Return a calendar matrix for the given values of month and year. Assume that Sunday is the first day of the week. The resulting ...

3 years ago

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Generate this matrix

For a given odd integer n, generate a matrix as follows: Input: n = 5; Output: [ 2 1 0 0 0 1 ...

3 years ago

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Rainbow matrix

Create a "rainbow matrix" as described in the following examples Input = 3 Output = [ 1 2 3 2 3 2 ...

3 years ago

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Generate this matrix

Generate the following matrix. n = 2; out = [-4 -3 -2 -1 0 -3 -2 -1 0 1 -...

3 years ago

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Pascal's pyramid

In Pascal's triangle each number is the sum of the two nearest numbers in the line above: 1 1 1 ...

3 years ago

Solved

Write a function man that takes a row vector v and returns a matrix H as follows..

Write a function called man that takes a row vector v as an input and returns a matrix H whose first column consist of the eleme...

3 years ago

Solved

Triangular matrices in 3D array

Given a 3D numeric array _x_, return an array _y_ of the same size in which all entries to the right of the main diagonal are ze...

3 years ago

Solved

BULLSEYE Part 2: Reference Problem 18 BULLSEYE

Given n (always odd), return output a that has concentric rings of the 1s and 0s around the center point. Examples: Input ...

3 years ago

Solved

ZigZag matrix with reflected format

ZigZag MATRIX with REFLECTED format. We have only input x. We have to create a matrix in the following pattern. input n=5...

3 years ago

Solved

Toeplitize a matrix

Similar to <http://www.mathworks.com/matlabcentral/cody/problems/3094-hankelize-a-matrix Problem 3094. Hankelize a matrix>, now ...

3 years ago