Panos Kerezoudis
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MATLAB
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Question
Segment data into overlapping windows
Hi! I have a vector of time series data (1x300), that I would like to segment into 20 segments that are 100 ms in duration and ...
12 maanden ago | 1 answer | 1
1
answerQuestion
Group values in a vector
Hi, I have a long column vector ('trialnr', attached), whose elements are integer numbers from 1 to 55 (they index events in t...
meer dan een jaar ago | 1 answer | 0
1
answerQuestion
Sort elements in cell array in descending order
Hi! I hava a cell containing three row vectors and I would like to sort each vector in descending order. Other than using a ...
meer dan een jaar ago | 1 answer | 0
1
answerQuestion
Signal auto-correlation in matlab (xcorr function)
Hi! I am working on an EEG-electrophysiology dataset ('csd'). It is structured as a 3D array (channels x time x trials). The d...
meer dan een jaar ago | 2 answers | 0
2
answersQuestion
Arrange column vetors into table
Hi! I used the findpeaks function in matlab to find local maxima ('peaks') in a vector and their indices ('locs'). I would li...
meer dan een jaar ago | 1 answer | 0
1
answerQuestion
Attach first column with names to matrix with coordinates
Hi! I have a matrix ('positions') with 3 columns (x,y,z coordinates) and 200 rows (intracranial electodes). I also have a cha...
meer dan een jaar ago | 1 answer | 0
1
answerQuestion
Plot legend labels using loop
I am plotting the power spectrum from 16 channels. PSD was calculated using the pwelch function and its output has 3 dimensions:...
meer dan een jaar ago | 1 answer | 0
1
answerQuestion
Bar plot of categorical data
Hi! I have a small column vector (46x1). Each row has a number (0-7), where each number encodes a specific electrode location. ...
meer dan een jaar ago | 1 answer | 0
1
answerSolved
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]; ...
bijna 2 jaar ago
Solved
Roll the Dice!
*Description* Return two random integers between 1 and 6, inclusive, to simulate rolling 2 dice. *Example* [x1,x2] =...
bijna 2 jaar ago
Solved
Check if number exists in vector
Return 1 if number _a_ exists in vector _b_ otherwise return 0. a = 3; b = [1,2,4]; Returns 0. a = 3; b = [1,...
bijna 2 jaar ago
Solved
Sum all integers from 1 to 2^n
Given the number x, y must be the summation of all integers from 1 to 2^x. For instance if x=2 then y must be 1+2+3+4=10.
bijna 2 jaar ago
Solved
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]
bijna 2 jaar ago
Solved
Flip the vector from right to left
Flip the vector from right to left. Examples x=[1:5], then y=[5 4 3 2 1] x=[1 4 6], then y=[6 4 1]; Request not ...
bijna 2 jaar 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...
bijna 2 jaar ago
Solved
Doubling elements in a vector
Given the vector A, return B in which all numbers in A are doubling. So for: A = [ 1 5 8 ] then B = [ 1 1 5 ...
bijna 2 jaar 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...
bijna 2 jaar ago
Solved
Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...
bijna 2 jaar ago
Solved
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 ...
bijna 2 jaar ago
Question
MATLAB Problem. How to design matrix from eigenvalues
This is a previously posted problem that I am working on but I can't find any solutions online. Here is the description: Write...
bijna 2 jaar ago | 2 answers | 0
2
answersQuestion
Make loop more efficient
Hi! I am new to Matlab and I am currently going through coding exerices to become more skilled at it. I would appreciate any h...
bijna 2 jaar ago | 1 answer | 0
1
answerSolved
Convert a numerical matrix into a cell array of strings
Given a numerical matrix, output a *cell array of string*. For example: if input = 1:3 output is {'1','2','3'} whic...
bijna 2 jaar ago
Solved
Create a vector whose elements depend on the previous element
The idea is to create a vector A whose elements depend on the previous element : *A(i+1) = 2*A(i)+1* *2 Inputs*: - A : The...
bijna 2 jaar 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...
bijna 2 jaar ago
Solved
Find the mean of two vectors
Take two vectors, and output the mean of them (bonus if you don't use the in-built mean function)
bijna 2 jaar ago
Solved
Replace 0 indices in array with 1's
Take a incoming vector, and replace 0's with ones
bijna 2 jaar ago
Solved
Simple Vector Addition
Take two incoming vectors and output the sum of the two vectors
bijna 2 jaar ago
Solved
Rescale Scores
Each column (except last) of matrix X contains students' scores in a course assignment or a test. The last column has a weighted...
bijna 2 jaar ago
Solved
Find the Best Hotels
Given three input variables: * |hotels| - a list of hotel names * |ratings| - their ratings in a city * |cutoff| - the rat...
bijna 2 jaar ago
Solved
Find MPG of Lightest Cars
The file |cars.mat| contains a table named |cars| with variables |Model|, |MPG|, |Horsepower|, |Weight|, and |Acceleration| for ...
bijna 2 jaar ago