Sebastian Holmqvist
Chalmers University of Technology
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Possible to vectorize xcorr?
After some time, I realized that x is the same throughout all calculations, which means that I can pre-calculate both it's FFT a...
11 years ago | 0
Question
Possible to vectorize xcorr?
Greetings. Currently my workstation can't keep up when I attempt to calculate the cross correlation for very long signals. ...
11 years ago | 1 answer | 0
1
answerQuestion
Extreme gain for low pass filter
% Filter constants Wp = 5e3*2*pi; Ws = 9.5e3*2*pi; Rp = 2; Rs = 45; % Butterworth lowest order [n,Wn] = ...
12 years ago | 1 answer | 0
1
answerQuestion
Arduino Run on Target Hardware + Stateflow
Hi! I'm trying to setup Arduino through Simulink on R2012a and use Stateflow. But when I try to deploy (Run on Target) it com...
12 years ago | 2 answers | 0
2
answersSolved
Finding Perfect Squares
Given a vector of numbers, return true if one of the numbers is a square of one of the other numbers. Otherwise return false. E...
12 years ago
Solved
Weighted average
Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...
12 years ago
Solved
Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...
12 years ago
Solved
Swap the first and last columns
Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...
12 years ago
Solved
Determine whether a vector is monotonically increasing
Return true if the elements of the input vector increase monotonically (i.e. each element is larger than the previous). Return f...
12 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 ...
12 years ago
Solved
Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...
12 years ago
Solved
Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...
12 years ago
Solved
Determine if input is odd
Given the input n, return true if n is odd or false if n is even.
12 years ago
Solved
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 ...
12 years ago
Solved
Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...
12 years ago
How can I get in code the path of currently running deployed matlab function
_pwd_ also returns the current path. This is what I use in my GUIs.
12 years ago | 0
| accepted
The thickness of border lines on a plot (different than that of the inner lines)
I found that the figure automatically chooses the renderer ZBuffer, which is the cause of your display issues. I can't answer as...
12 years ago | 0
How to tell Matlab to ignore NaNs in calculations/loops
data_vec = [1 2 3 4 5 NaN 7 8 NaN 10 12]; data_vec(~isnan(data_vec)) ans = 1 2 3 4 5 7 8 10 12
12 years ago | 0
How to calculate hash sum of a string (using java)?
*Solution:* The trick here is to input an ascii representation of your string (hence, the double(string) call). MessageDigest...
12 years ago | 3
| accepted
Question
How to calculate hash sum of a string (using java)?
Couldn't find this very easily (without including a bunch of c-mex files etc) so I thought I'd post it here for future reference...
12 years ago | 2 answers | 0
2
answersQuestion
Count the number of trend changes in a vector.
I need to count the number of times a vector increases/decreases. E.g vec = [0 0 1 2 4 4 2 0 1 2 3] diff(vec) ans ...
12 years ago | 3 answers | 0
3
answersQuestion
XML parsing vs regexp
I'm trying to extract values from two elements in a pretty large xml. I'm stuck between doing it "the right way" and doing it "t...
12 years ago | 1 answer | 1
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answerEigenvalue calculation in MATLAB
From <http://www.mathworks.se/help/techdoc/ref/eig.html> [V,D] = eig(A,B,flag) specifies the algorithm used to compute eigen...
12 years ago | 2
Having trouble compiling uigetfile function
It always works for me. It could be that you only call filename = uigetfile('*.xls','Select your file'); Instead, you sho...
12 years ago | 2
| accepted
Changing values in 2D array using logical operators
aa = rand(10, 10); aa(aa < 0.5) = NaN;
12 years ago | 0
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Count the number of trend changes in a vector.
I think I've cracked it. My logic follows from; # I wish to count the number of first derivative changes. # I wish to exclud...
12 years ago | 0
How can I Read or get the Values one by one from matrix variable or array?
z_elem = nnz(nnz == 0) nz_elem = nnz(nnz ~= 0) Then do your calculations on each.
12 years ago | 0