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# the cyclist

### Alden Scientific

Last seen: Today Active since 2011

Head of Modeling and Statistics at Alden Scientific. Obsessive runner. Professional Interests: Predictive modeling, statistics. (I don't respond to email via author page, but will usually look at a question if you send me a link to it.)

Programming Languages:
Python, R, MATLAB, SQL
Spoken Languages:
English

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Hello everyone, I want to restrict the domain of a vector to return it to a smaller data set. For example, X between 2 and 7
X = [ 1 2 3 4 5 6 7 8 9 10 ]; idxToKeep = (X>=2) & (X<=7); Xkeep = X(idxToKeep) You can also do it all in one...

ongeveer 19 uur ago | 0

chose the marker with plot3d
It looks like you used a hyphen instead of an underscore. x = 1:5; y = rand(1,5); z = rand(1,5); figure plot3(x,y,z,'blac...

ongeveer 19 uur ago | 0

How to improve regression models for a dataset with too many variables?
@NC_, as I expect you realize, your question is not really a MATLAB question, but is a generic machine learning question. You ar...

1 dag ago | 0

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i trying to 3d plot, but mesh nor plot3 worked
This is what I get from your equation: xv = -5 : 0.01 : 5; yv = -5 : 0.01 : 5; [x,y] = meshgrid(xv,yv); f = 10*x.^2.*y -...

1 dag ago | 1

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How can I find negative factorial ? (-0.5)!
Use the gamma function: x = -0.5; gamma(x+1) % gamma(x+1) is equal to factorial(x)

2 dagen ago | 1

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Converting Matrix to base b fails
dec2base returns a character array representation that can be multiple characters: dec2base(7,2) % "convert" decimal 7 to base ...

2 dagen ago | 0

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How can I insert a title under a group of subplots?
Personally, I would use the more modern tiledlayout (rather than subplot), but then add your text using an annotation (or just t...

6 dagen ago | 1

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Unable to perform assignment because the size of the left side is 1-by-1
My best guess as to the problem is that in this expression ones(1,k+i)-K(k+i) you don't really intend to add a vector of ones ...

11 dagen ago | 1

Set one common Xaxis for a sublot with rows = 1 and columns = 2
You may find the linkaxes command useful. You can also share properties (e.g. titles, xlabels) in a tiledlayout.

11 dagen ago | 0

what is the equivalent of 'improfile' in octave?
This Octave wiki page suggests that the improfile function is missing from Octave.

15 dagen ago | 0

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How do i delete the spaces that are in the middle of a string array?
Here is one way: str=' 123 456 '; str(str==' ') = [] This method relies on the fact that the white space is a space cha...

17 dagen ago | 1

Curve smoothing / fitting
Do you mean you want a smooth line that goes through all the points? You could fit a spline: % Set seed for reproducibility rn...

17 dagen ago | 0

Want to be able to call python 3.9 from MATLAB 2022a
I am not on a Windows machine, but I am pretty confident you want to download and run the last one you listed, the 64-bit Window...

17 dagen ago | 0

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Count the number of "aggregate" peaks in a vector?
I am absolutely positively NOT an expert in this, but I think what might be helpful here is putting your signal through a low-pa...

19 dagen ago | 1

How to increase the distance between labels on the matrix axes
When you say that making the font size smaller "didn't work", can you be more specific? Do you mean that even with the smallest ...

19 dagen ago | 0

What kind of coding do I need to create a program that will recognize the word I am saying and repeat that same word to me?
Take a look at the documentation on how to Record and Play Audio in MATLAB. FYI, it took me literally a few seconds to google t...

19 dagen ago | 0

I ran your code here. You can see that figure it creates. That's what the code does. It defines some data, does some calculation...

19 dagen ago | 1

Replicating one dimension of a 3d matrix
If M is your array, then output = repmat(M,[10,1,1]);

21 dagen ago | 1

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Matlab does plot datetime data (only hours) on wrong day
The most fundamental fix to your issue is to explicitly use the modern datetime format for your times. Then, downstream function...

25 dagen ago | 0

How to split a 3 by 3 matrix into rows and save rows separetly in arrays
ra = NewRange(1,:); rb = NewRange(2,:); rc = NewRange(3,:); Be aware that you may not actually need to do this separation, be...

26 dagen ago | 0

predictorImportance changes between releases
Are the ML model results themselves identical? Off the top of my head, I don't know enough about the algorithm and possible cha...

27 dagen ago | 0

How to add a line break in categorical array?
Here is one way: X = categorical({sprintf('First Inter-monsoon\\newline (March - April)'), ... sprintf('South...

28 dagen ago | 1

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using eval with save function
It can be tricky to construct the string needed, from a combination of text and numerics. I would recommend a few things here. ...

ongeveer een maand ago | 1

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add value from single element of array
Your example is confusing to me, partly because I think you made some careless math errors. But, the way I could approach this i...

ongeveer een maand ago | 0

remove the frequent values withou sorting
You can still use unique: x = [3 4 3 5 1 0 4 2]; x = unique(x,"stable")

ongeveer een maand ago | 1

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Show Statistics in a Special Figure
One approach would be find a plot (or plots) in the MATLAB Plot Gallery that look similar to what you want, download that code, ...

ongeveer een maand ago | 0

run matlab on cloud platform
Yes, there are cloud platform options for running MATLAB. I suggest taking a look at this documentation to get started. (FYI, t...

ongeveer een maand ago | 0

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How do I set a parameter based on individual values in an existing array? Should I use a for loop or something else?
My best guess here is that L is a vector, and you are expecting the if-else logic to work on the entire vector simultaneously. T...

ongeveer een maand ago | 0