MarKf

Active since 2022

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https://markwelt.github.io/

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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Spherical Volume
Calculate the volume of a sphere.

11 days ago

Solved

Area of a Square
Given the length x of the side of a regular square, find the area of the square, A.

11 days ago

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area of an annulus
Given the diameter d of the inner circle of the annulus. Given length z of a chord of the outer circle of the annulus. This chor...

11 days ago

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Repopulate the City
For any population p of positive integers between pmin and pmax, we can calculate histogram count n for a list of evenly dividin...

2 months ago

Solved

Remove a specific column with min value
Remove the column that contain the min value in the matrix? If you like the problem, please give it a like:)

2 months ago

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Find Rows with Specift Properities
Delete rows with specific properites as following: Find rows that have a negative value in any element of the row and delete it...

2 months ago

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remove every row&col for every nan
for a given matrix, remove the row and column of every nan. Example x=[1 2 NaN 4 5 6 7 8 ...

2 months ago

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row removal
Consider a matrix and remove the first row of the matrix.

2 months ago

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Remove all the columns contains only zero
Remove the column from the matrix which has only zeros . Refer the Example below a= 1 0 3 0 23 0 56 0 1 ...

2 months ago

Solved

Remove a specific row with min value
Remove the row that contain the min value in the matrix? If you like the problem, please give it a like:)

2 months ago

Solved

Remove a specific row with max value
Remove the row that contain the max value in the matrix? If you like the problem, please like it :)

2 months ago

Solved

Remove a specific column with max value
Remove the column that contain the max value in the matrix? If you like the problem, please give it a like:)

2 months ago

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...

9 months ago | 0

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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, ...

10 months 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)

11 months ago | 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...

11 months ago | 0

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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...

1 year 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) ...

1 year 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(...

1 year 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...

1 year ago | 0

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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 ...

1 year 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...

1 year 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...

1 year ago | 1

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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...

1 year 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...

1 year 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...

1 year ago | 1

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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...

1 year 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 ...

1 year ago | 0

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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...

1 year 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...

1 year ago

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