MarKf

Con actividad desde 2022

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https://markwelt.github.io/

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

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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...

alrededor de 2 meses hace | 0

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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, ...

3 meses hace | 0

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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)

4 meses hace | 0

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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...

5 meses hace | 0

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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...

6 meses hace | 0

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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) ...

7 meses hace | 2

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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(...

7 meses hace | 1

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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...

7 meses hace | 0

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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 ...

8 meses hace | 1

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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...

8 meses hace | 0

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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...

8 meses hace | 1

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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...

8 meses hace | 0

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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...

8 meses hace | 0

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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...

8 meses hace | 1

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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...

8 meses hace | 2

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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 ...

8 meses hace | 0

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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...

9 meses hace | 0

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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...

10 meses hace

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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...

10 meses hace

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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...

10 meses hace | 0

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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...

10 meses hace | 1

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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...

10 meses hace | 0

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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 ...

11 meses hace | 0

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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...

11 meses hace

Resuelto

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...

11 meses hace

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

11 meses hace

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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...

12 meses hace | 0

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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), ...

12 meses hace | 0

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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...

12 meses hace | 0

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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 ...

alrededor de 1 año hace | 0

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