Stefan Wehmeier
MathWorks
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Working on the symbolic toolbox, mostly in the MuPAD language. Responsible for solvers and simplifiers.
Professional Interests: computer algebra
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10 of your answers have been accepted
Awarded to Stefan Wehmeier on 15 Feb 2022
3 of your answers have been accepted
Awarded to Stefan Wehmeier on 20 Jul 2017
Provide your first answer ever to someone else's question
Awarded to Stefan Wehmeier on 20 Jul 2017
Solve a problem for the first time
Awarded to Stefan Wehmeier on 10 Sep 2014
Feeds
How to stop MATLAB livescript from simplifying the answer?
Use sympref('AbbreviateOutput', false)
etwa 6 Jahre vor | 3
| akzeptiert
These equations have an answer - how to get solve to find it?
Why not just solve(expression1 == expression2, u) ? What you did is to confuse assignemnts/assumptions with equations. You ...
mehr als 6 Jahre vor | 0
Function Iteration for n times, but n is NOT a fixed number
Why don't you make your last source code the body of a function? Is l at any time called with non-constant argument, such that y...
mehr als 6 Jahre vor | 0
an error in new versions? triognometric function of A*t
It is a matter of taste if you prefer results in terms of exp or sin. You could do simplify(rewrite(A1, 'sin'))
mehr als 6 Jahre vor | 1
| akzeptiert
Symbolic toolbox mpower unexpected behaviour
You can use symbolic N but not in connection with mpower. As T^N = exp(N*log(T)), write TN = expm(N*logm(T)) and procee...
fast 7 Jahre vor | 1
| akzeptiert
mupad command calling from matlab produce wrong results
I cannot reproduce this. In any case, you cannot work with intervals in MATLAB; this is why poles(f) gives you just the ...
etwa 7 Jahre vor | 0
Why does eig(A) not return a symbolic array for my symbolic matrix A?
The roots of polynomials of degree > 4 usually do not have a symbolic representation. The same holds for eigenvalues as they are...
fast 9 Jahre vor | 0
| akzeptiert
Simplify expression with exponential function.
Use exp(sym(1))
fast 9 Jahre vor | 2
| akzeptiert
Parametric solutions to system of equations inequations via solve()
I see that you are using R2014a. Then your only option is to solve for one variable solve(e(1) == 0, a) and take this as...
mehr als 9 Jahre vor | 0
| akzeptiert
subs(a,b,1) introduces variable b into a?
I cannot reproduce this. If it happens (in which version ??), then it is clearly unexpected.
mehr als 9 Jahre vor | 0
Problems with matlab symbolic dsolve function
The correct syntax is syms y(x) dsolve(diff(y, x, x) +y==x*exp(-x^2)) as it declares y as a function of x (and not of...
mehr als 9 Jahre vor | 0
Matlab 2012b too slow when solving a system of two equations on mupadmex(statement)
A running time of one hour can be normal if the equations are very complicated. Since your code does not run as it stands, it is...
mehr als 9 Jahre vor | 0
Symbolic array pre-allocation
My question is in which form do you have the 50000 entries you want to fill in. As strings in a cell array A? Then B = cell...
mehr als 9 Jahre vor | 0
| akzeptiert
Gelöst
Return the first and last character of a string
Return the first and last character of a string, concatenated together. If there is only one character in the string, the functi...
mehr als 9 Jahre vor
Gelöst
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...
mehr als 9 Jahre vor
Gelöst
Determine if input is odd
Given the input n, return true if n is odd or false if n is even.
mehr als 9 Jahre vor
Gelöst
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...
mehr als 9 Jahre vor
Gelöst
De-dupe
Remove all the redundant elements in a vector, but keep the first occurrence of each value in its original location. So if a =...
mehr als 9 Jahre vor
Gelöst
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 ...
mehr als 9 Jahre vor
Gelöst
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...
mehr als 9 Jahre vor
Gelöst
Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...
mehr als 9 Jahre vor
Gelöst
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...
mehr als 9 Jahre vor
Gelöst
Swap the input arguments
Write a two-input, two-output function that swaps its two input arguments. For example: [q,r] = swap(5,10) returns q = ...
mehr als 9 Jahre vor
Gelöst
Nearest Numbers
Given a row vector of numbers, find the indices of the two nearest numbers. Examples: [index1 index2] = nearestNumbers([2 5 3...
mehr als 9 Jahre vor
Gelöst
The Goldbach Conjecture
The <http://en.wikipedia.org/wiki/Goldbach's_conjecture Goldbach conjecture> asserts that every even integer greater than 2 can ...
mehr als 9 Jahre vor
Gelöst
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 + ...
mehr als 9 Jahre vor
Gelöst
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...
mehr als 9 Jahre vor
Gelöst
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...
mehr als 9 Jahre vor
Gelöst
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...
mehr als 9 Jahre vor
Gelöst
Who knows the last digit of pi?
There is only one man who knows the last digit of pi, who is that man? Give the name of that man, who, by popular believe, can ...
mehr als 9 Jahre vor
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