# Sebastian Holmqvist

### Chalmers University of Technology

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**9** Questions

**14** Answers

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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

### 1

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

| accepted

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