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# Shlomo Geva

Last seen: 2 months ago Active since 2017

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How to step through vector permutations in a parallel loop, without generating all permutations in advance?
I need a paralleised loop to step through all permutations of 1:N Even though for some values of N it is computationally feasib...

2 months ago | 2 answers | 0

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Question

How to generate M *almost* mutually orthogonal vectors of dimensionality N, where M>>N ?
Generating mutually orthogonal vectors in is easy enough. I am looking for vectors in , where , and the vectors are almost ...

10 months ago | 2 answers | 0

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Question

How to return a uint64_t from a mex function?
I want to assign to plhs[0] a scalar of type uint64_t. Not sure what function to call. e.g. if I have uint64_t y=123; and I...

1 year ago | 1 answer | 0

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how to get average of multiple rows and subtract from one group of average to another
Here is a solution to also take care of a number of rows that is not a multiple of your grouping (e.g. 30). I made up a matrix ...

2 years ago | 0

how to get average of multiple rows and subtract from one group of average to another
%% load the fille into memory with M = csvread(filename) %% loop around M, 30 rows at a time for i=1:30:si...

2 years ago | 0

How do I get MATLAB to compare strings in the same way as the strcmp(str1,str2) method in the ANSI C API?
function c = cstrcmp(a,b) % c style strcmp. No type checks, use only strings and char arrays. if strcmp(a,b) c=0; else ...

2 years ago | 0

Question

Critical code section inside parfor
With C++ one can define critical code section inside a parallel for. Is there a similar construct that can be used with Matla...

2 years ago | 2 answers | 0

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Submitted

progressDemo
A demo of a very simple progress monitor for parfor

k distinct combinations of size p without replacement
You can get this as follows: 1. First generate all binary vectors of size 2^N n=dec2bin(0:2^N-1)-'0'; in the examplll...

2 years ago | 0

Find multiple elements in an array.
function out = findMultipleElements(a,b) % Find multiple elements in an array % example: % a = [1 5 2 5 3 5 4 2...

2 years ago | 0

Solved

Rewrite setdiff to account for non-unique values
Setdiff(a,b) is a function that will remove all values of b from a. Sometimes, you need this function to do a little bit extra,...

2 years ago

Solved

Renaming a field in a structure array
MATLAB has a <http://www.mathworks.com/help/techdoc/ref/setfield.html setfield> and a <http://www.mathworks.com/help/techdoc/ref...

2 years ago

Solved

Implement a ROT13 cipher
Replace each character in string s1 with the character that is shifted 13 positions from it (wrap back to the beginning if neces...

2 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 ...

2 years ago

Solved

Who Has the Most Change?
You have a matrix for which each row is a person and the columns represent the number of quarters, nickels, dimes, and pennies t...

2 years ago

Solved

Find the numeric mean of the prime numbers in a matrix.
There will always be at least one prime in the matrix. Example: Input in = [ 8 3 5 9 ] Output out is 4...

2 years ago

Solved

Fibonacci sequence
Calculate the nth Fibonacci number. Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ... Examples: Inpu...

2 years ago

Solved

Given a and b, return the sum a+b in c.

2 years ago

Solved

Sums with Excluded Digits
Add all the integers from 1 to n in which the digit m does not appear. m will always be a single digit integer from 0 to 9. no...

2 years ago

Solved

Making change
Given an amount of currency, return a vector of this form: [100 50 20 10 5 2 1 0.5 0.25 0.1 0.05 0.01] Example: Input a = ...

2 years ago

Solved

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

2 years ago

Solved

Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

2 years ago

Solved

Which doors are open?
There are n doors in an alley. Initially they are all shut. You have been tasked to go down the alley n times, and open/shut the...

2 years ago

Solved

Make a Palindrome Number
Some numbers like 323 are palindromes. Other numbers like 124 are not. But look what happens when we add that number to a revers...

2 years ago

Solved

Trimming Spaces
Given a string, remove all leading and trailing spaces (where space is defined as ASCII 32). Input a = ' singular value deco...

2 years ago

Solved

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...

2 years ago

Solved

Find the alphabetic word product
If the input string s is a word like 'hello', then the output word product p is a number based on the correspondence a=1, b=2, ....

2 years ago

Solved

Remove the polynomials that have positive real elements of their roots.
The characteristic equation for a dynamic system is a polynomial whose roots indicate its behavior. If any of the <http://www.ma...

2 years ago

Solved

Subset Sum
Given a vector v of integers and an integer n, return the the indices of v (as a row vector in ascending order) that sum to n. I...

2 years ago