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Bobby Cheng

Last seen: 1 giorno fa |  Attivo dal 2012

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  • MATLAB Mini Hack 2022 Participant
  • Knowledgeable Level 1
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Risposto
bsxfun vs implicit expansion
Hi Bradley, Just come across this today. To answer you question, you should always use Implicit Expansion instead of bsxfun whe...

circa un mese fa | 0

Risposto
Toolboxes installation in MATLAB beta for Native Apple Silicon
R2022b beta is now available. With this beta, there is a list of toolboxes that you can test.

circa 2 anni fa | 2

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2022b for apple M1
The R2022b beta for Apple M1 is here. Please visit this page https://www.mathworks.com/support/apple-silicon-r2022b-beta.html

circa 2 anni fa | 0

| accettato

Risposto
Matlab is significantly slower than Julia on simple evaluation
First of all, thank you for creating the benchmark and raising this performance issue. Indeed, we are seeing more and more perfo...

circa 3 anni fa | 12

| accettato

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expm function problem for stiff matrix
This is a weakness of the scaling and squaring algorithm. Inside EXPM, which you can read the implementation, there are special ...

oltre 3 anni fa | 0

Risposto
Is there a big error in the method matlab uses to finds sqrtm?
This is an interesting example. It goes to the heart of the issue when computes with floating point arithmetic. First consider t...

circa 9 anni fa | 3

Risolto


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]

oltre 12 anni fa

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Make one big string out of two smaller strings
If you have two small strings, like 'a' and 'b', return them put together like 'ab'. 'a' and 'b' => 'ab' For extra ...

oltre 12 anni fa

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Is my wife right? Now with even more wrong husband
Again, as in "Is my wife right?" ( <http://www.mathworks.com/matlabcentral/cody/problems/149-is-my-wife-right> ), answer 'yes' r...

quasi 13 anni fa

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Magic!
Check whether the input matrix is a normal magic square: <http://en.wikipedia.org/wiki/Magic_square> Output the logical va...

quasi 13 anni fa

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The Hitchhiker's Guide to MATLAB
Output logical "true" if the input is the answer to life, the universe and everything. Otherwise, output logical "false".

quasi 13 anni fa

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inner product of two vectors
inner product of two vectors

quasi 13 anni fa

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

quasi 13 anni fa

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Too mean-spirited
Find the mean of each consecutive pair of numbers in the input row vector. For example, x=[1 2 3] ----> y = [1.5 2.5] x=[1...

quasi 13 anni fa

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Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

quasi 13 anni fa

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Is my wife right?
Regardless of input, output the string 'yes'.

quasi 13 anni fa

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Function Iterator
Given a handle fh to a function which takes a scalar input and returns a scalar output and an integer n >= 1, return a handle f...

quasi 13 anni fa

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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...

quasi 13 anni fa

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

quasi 13 anni fa

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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...

quasi 13 anni fa

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How to find the position of an element in a vector without using the find function
Write a function posX=findPosition(x,y) where x is a vector and y is the number that you are searching for. Examples: fin...

quasi 13 anni fa

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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...

quasi 13 anni fa

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Target sorting
Sort the given list of numbers |a| according to how far away each element is from the target value |t|. The result should return...

quasi 13 anni fa

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Summing digits
Given n, find the sum of the digits that make up 2^n. Example: Input n = 7 Output b = 11 since 2^7 = 128, and 1 + ...

quasi 13 anni fa

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Pascal's Triangle
Given an integer n >= 0, generate the length n+1 row vector representing the n-th row of <http://en.wikipedia.org/wiki/Pascals_t...

quasi 13 anni fa

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Replace NaNs with the number that appears to its left in the row.
Replace NaNs with the number that appears to its left in the row. If there are more than one consecutive NaNs, they should all ...

quasi 13 anni fa

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Binary numbers
Given a positive, scalar integer n, create a (2^n)-by-n double-precision matrix containing the binary numbers from 0 through 2^n...

quasi 13 anni fa

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Weighted average
Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

quasi 13 anni fa

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Create times-tables
At one time or another, we all had to memorize boring times tables. 5 times 5 is 25. 5 times 6 is 30. 12 times 12 is way more th...

quasi 13 anni fa

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Return a list sorted by number of occurrences
Given a vector x, return a vector y of the unique values in x sorted by the number of occurrences in x. Ties are resolved by a ...

quasi 13 anni fa

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