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MarKf


Active since 2022

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Programming Languages:
Python, MATLAB, HTML, Shell, Visual Basic
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English, French, German, Italian, Spanish
Professional Interests:
Macroeconomics, Neuroscience, Statistics

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Answered
How to plot a 3D cube or a horizontal slice from the following 3D data?
Alright let's write an actual answer with isocaps and patch then, the suggestion to use scatter3 in the comment above is valid b...

4 maanden ago | 0

| accepted

Answered
Indexing array by 2 variables in a for loop
You need to select each participant for each period, then doing a ttest on only those 51(*2 data matrices possibly) datapoints, ...

5 maanden ago | 0

Answered
Find the eigenvalue of the matrix R and store it to the variable E
R=[1 2 1; 2 3 4; 4 3 2]; R1 =[8;20;16]; r = rank(R) X = linsolve(R,R1) E = eig(R)

6 maanden ago | 0

| accepted

Answered
Band-Pass Filter butter problem
Something something Nyquist frequency.... If you provide the missing data to your example you could get a better answer f_st...

6 maanden ago | 0

| accepted

Answered
How do i find x from given y that is closest to my peak or at x=0?
I'm assuming you just have the data points of the line and not the function otherwise the question would be answered with the mo...

8 maanden ago | 0

Answered
rotate/translate/zoom the two simultaneously generated figures within subplot
You mean with the figure utilities after plotting beetween subplots? You can use linkaxes (or linkprop for a specific property) ...

9 maanden ago | 2

Answered
Issue with plotting two figures using for-loop method
Do you just mean that the second figure is half as high because you did subplot(2, 4,...) in the second part instead of subplot(...

9 maanden ago | 1

Answered
Clearing the last plotted image in a for loop.
The function provided does not work out of the box (and you haven't boxed it in code format anyway) so you have more than the is...

9 maanden ago | 0

| accepted

Answered
extract all rows of a matrix except 'r' (vector) rows
mat = magic(8) r_not = [1 3:5 8]; mat(r_not,:) = [] %use mat_o = mat; to keep the original mat; There are some issues with ...

10 maanden ago | 1

Answered
Matrix to Scalar Problem
Use a dot "." before an element-wise operation, that is also to multiply, divide, raise etc a scalar value to each of the elemen...

10 maanden ago | 0

Answered
I run this but its given me issues. Can someone assist
I assume that the copy and paste of your code did not go well... but then you should've fixed it before posting. Even after fix...

10 maanden ago | 1

| accepted

Answered
There is anyway that I can plot a graph like this in MatLab with standard deviation ?
n = 15; x = randn(n,1); y = randn(n,1); sx = std(x); sy = std(y); %maybe non-randn data will have smaller std lregsrts = regst...

10 maanden ago | 0

Answered
I have a MATLab invalid expression when calling variables.
What would be the error? I can already see some errors in the OPF (I'm guessing the mistake would be using semicolons ";" inst...

10 maanden ago | 0

Answered
Matlab outer file function
Invalid use of operator "." You can't tell a function to make an output a struct (since that might break things, you can only a...

10 maanden ago | 1

| accepted

Answered
Correlation and regression between matrixes with NaN values
I see, "array1" has some islands of values in a sea of NaNs. ar1 = load(websave('rd', "https://nl.mathworks.com/matlabcentral/a...

10 maanden ago | 2

Answered
How can I reduce the number of digits in the colorbar?
You likely need something like this. surf(1+peaks*0.00001) %obvs this is a quick and bad example, it'd have helped to have the ...

10 maanden ago | 0

| accepted

Answered
What is the difference between the userpath and the startup folder?
They are different. Matlab starts in the startup folder, the initial working folder, it's displayed on the "Current Folder" pane...

11 maanden ago | 0

Solved


A Binary Search
One way to locate a target value in a sorted array, is to use a binary search algorithm. Here, you test if the midpoint in the a...

12 maanden ago

Solved


Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
For a row vector: V=[7 1 2 -3] there is one sign change (from 2 to -3). So, the function you write must return N=1. F...

12 maanden ago

Answered
how can I run function in file exchange
You're right, that sauvola.m that you linked has only 45 lines (but there's no actual end that terminates the function definitio...

12 maanden ago | 0

| accepted

Answered
How to select, or filter, the external border/boundary in a set of (x,y)-points?
ismember As in borders = load(websave('rd', "https://nl.mathworks.com/matlabcentral/answers/uploaded_files/1430803/borders.ma...

12 maanden ago | 1

Answered
Plot a mean of ten lines of different resolution
I see, this is overly complicated. Not as in complex or difficult, as in made needlessly overly complicated. Let's just say you...

12 maanden ago | 0

Answered
FFT from a excel file
Well, make sure that the data contained in channel1Data2 is numeric (double, single, int8, etc..). From the question title it ...

ongeveer een jaar ago | 0

Solved


Determine point is located in a circle or not
Using input [x] and [y], determine the points (x,y) is located inside of circle (x^2+y^2=1) if point is located in circle, outp...

ongeveer een jaar ago

Solved


Average speed for the entire trip
The input is two speeds (for the trip and return trip) and output is average speed. Assume units are consistent, say miles per h...

ongeveer een jaar ago

Solved


Test if a matrix is symmetric
Write a logical function that returns 1 if the input matrix is symmetric and 0 otherwise.

ongeveer een jaar ago

Answered
How to check whether partial correlation is significant or not at 5% significance level?
A partial correlation means you are controlling or "partialing out" some variance that is explained by -usually- another (3rd) v...

ongeveer een jaar ago | 0

Answered
How To multiply this Formula to run this code Please
The fact that there is the need for a loop for these operations, that b is not simply obtained with b=-T.*h, that [ones(1,i-1), ...

ongeveer een jaar ago | 0

| accepted

Answered
How to plot Confusion Matrix with tolerence limit ?
So you just want to translate the pseudo code above into working code and choose how to best plot it. The pseudo code probably d...

ongeveer een jaar ago | 0

| accepted

Answered
I can't run the code I wrote the way I want. Please help me
By "I cannot change the K value at every T value" I imagine you need K to change for every iteration and therefore have sitll 6 ...

ongeveer een jaar ago | 0

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