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Bobby Cheng

Last seen: 1 jour il y a |  Actif depuis 2012

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  • MATLAB Mini Hack 2022 Participant
  • Knowledgeable Level 1
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Réponse apportée
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...

environ un mois il y a | 0

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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.

environ 2 ans il y a | 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

environ 2 ans il y a | 0

| A accepté

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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...

environ 3 ans il y a | 12

| A accepté

Réponse apportée
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 ...

plus de 3 ans il y a | 0

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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...

environ 9 ans il y a | 3

A résolu


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]

plus de 12 ans il y a

A résolu


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 ...

plus de 12 ans il y a

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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...

presque 13 ans il y a

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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...

presque 13 ans il y a

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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".

presque 13 ans il y a

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inner product of two vectors
inner product of two vectors

presque 13 ans il y a

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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. ...

presque 13 ans il y a

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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...

presque 13 ans il y a

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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...

presque 13 ans il y a

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

presque 13 ans il y a

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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...

presque 13 ans il y a

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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...

presque 13 ans il y a

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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...

presque 13 ans il y a

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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...

presque 13 ans il y a

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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...

presque 13 ans il y a

A résolu


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...

presque 13 ans il y a

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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...

presque 13 ans il y a

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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 + ...

presque 13 ans il y a

A résolu


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...

presque 13 ans il y a

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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 ...

presque 13 ans il y a

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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...

presque 13 ans il y a

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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...

presque 13 ans il y a

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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...

presque 13 ans il y a

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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 ...

presque 13 ans il y a

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