# Cedric Wannaz

General interest: interdisciplinary approaches to complex problems (in particular mixing Mathematics, Physics, and Computer science).

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**Content Feed**

Solved

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,...

4 years ago

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...

8 years ago

Solved

Return the 3n+1 sequence for n

A Collatz sequence is the sequence where, for a given number n, the next number in the sequence is either n/2 if the number is e...

8 years ago

Solved

Convert a cell-array of values to MATLAB source code

The MATLAB interpreter loads your code and executes it using the Read-Evaluate-Print-Loop (see <http://en.wikipedia.org/wiki/REP...

8 years ago

Problem

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...

8 years ago | 2 | 100 solvers

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...

8 years ago

Problem

Find names/words that start and end with the same letter.

Find names/words (from a string) that start and end with the same letter. * Case-insensitive. * If a name/word is not at the...

8 years ago | 2 | 35 solvers

Solved

Find names/words that start and end with the same letter.

Find names/words (from a string) that start and end with the same letter. * Case-insensitive. * If a name/word is not at the...

8 years ago

Solved

Return the Nth Output from an Input Command

*Description* Given _F_, a cell array whose first element is a function handle and subsequent elements are arguments, return ...

8 years ago

Solved

Remove all the consonants

Remove all the consonants in the given phrase. Example: Input s1 = 'Jack and Jill went up the hill'; Output s2 is 'a ...

8 years ago

Solved

Get the area codes from a list of phone numbers

Given a string of text with phone numbers in it, return a unique'd cell array of strings that are the area codes. s = '508-647...

8 years ago

Solved

Rotate input square matrix 90 degrees CCW without rot90

Rotate input matrix (which will be square) 90 degrees counter-clockwise without using rot90,flipud,fliplr, or flipdim (or eval)....

8 years ago

Solved

Find the two-word state names

Given a list of states, remove all the states that have two-word names. If s1 = 'Alabama Montana North Carolina Vermont N...

8 years ago

Solved

Vectorizing, too easy or too hard?

Please insert a . before any ^, * or / in the string. That's it!!

8 years ago

Solved

Find state names that start with the letter N

Given a list of US states, remove all the states that start with the letter N. If s1 = 'Alabama Montana Nebraska Vermont Ne...

8 years ago

Solved

Counting Money

Add the numbers given in the cell array of strings. The strings represent amounts of money using this notation: $99,999.99. E...

8 years ago

Solved

Alphabetize by last name

Given a list of names in a cell array, sort the list by the last name. So if list = {'Barney Google','Snuffy Smith','Dagwood ...

8 years ago

Solved

Remove all the words that end with "ain"

Given the string s1, return the string s2 with the target characters removed. For example, given s1 = 'the main event' your ...

8 years ago

Solved

Test for balanced parentheses

Given the input inStr, give the boolean output out indicating whether all the parentheses are balanced. Examples: * If ...

8 years ago

Solved

Find the longest sequence of 1's in a binary sequence.

Given a string such as s = '011110010000000100010111' find the length of the longest string of consecutive 1's. In this examp...

8 years ago

Solved

Find state names that end with the letter A

Given a list of US states, remove all the states that end with the letter A. Example: Input s1 = 'Alabama Montana Nebras...

8 years ago

Solved

MATCH THE STRINGS (2 CHAR) very easy

Match the given string based on first two characters on each string. For example A='harsa'; b='harish'; result '1' ...

8 years ago

Solved

Pattern matching

Given a matrix, m-by-n, find all the rows that have the same "increase, decrease, or stay same" pattern going across the columns...

8 years ago

Solved

Which values occur exactly three times?

Return a list of all values (sorted smallest to largest) that appear exactly three times in the input vector x. So if x = [1 2...

8 years ago

Solved

Reverse the vector

Reverse the vector elements. Example: Input x = [1,2,3,4,5,6,7,8,9] Output y = [9,8,7,6,5,4,3,2,1]

8 years ago

Solved

Distance walked 1D

Suppose you go from position 7 to 10 to 6 to 4. Then you have walked 9 units of distance, since 7 to 10 is 3 units, 10 to 6 is 4...

8 years ago

Solved

It dseon't mettar waht oedrr the lrettes in a wrod are.

An internet meme from 2003 (read more <http://www.snopes.com/language/apocryph/cambridge.asp here>) asserted that readers are re...

8 years ago

Solved

Quote Doubler

Given a string s1, find all occurrences of the single quote character and replace them with two occurrences of the single quote ...

8 years ago

Solved

Program an exclusive OR operation with logical operators

Program an exclusive or operation *without* using the MATLAB function xor. Use logical operators like |, &, ~, ... instead. ...

8 years ago

Solved

Extract leading non-zero digit

<http://en.wikipedia.org/wiki/Benford%27s_law Benford's Law> states that the distribution of leading digits is not random. This...

8 years ago