the cyclist

Alden Scientific

Last seen: Today | Active since 2011

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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
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English
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Answered
Why is pagemtimes slower than just coding up the matrix multiplication?Especially on GPU.
It seems to me that the two functions are not calculating the same thing, based on the size of their respective outputs: rng ...

21 days ago | 1

Answered
SVM Fitcsvm() thresholds vs ROC curve thresholds
fitcsvm() fits the best possible SVM to the data. That function itself does not make the predictions. The resulting model objec...

28 days ago | 0

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a function slows down my profiler: I would like to speed it up
It won't be a big speedup, but I would expect idx=find(Ntradess(id:-1:1,x)<=a1,1,'first'); to be consistently faster than idx...

1 month ago | 0

Answered
Two lines of plot title with number and date time
Since R2020b, there is a subtitle function. Here is how I would have written your code, incorporating that and some other change...

1 month ago | 0

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Can't open additional instance of MATLAB in release 2024b?
R2024b Update 1 fixed this (presumed) bug.

1 month ago | 0

Question

Can't open additional instance of MATLAB in release 2024b?
I'm on a Mac (M1), running the latest OSX. I don't seem to be able to open an additional instance of MATLAB by right-clicking o...

1 month ago | 3 answers | 0

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answers

Answered
KS TEST fails at 0.05 but passes at 0.01
R = load('R.txt'); coeff = betafit(R); a_mle = coeff(1); b_mle = coeff(2); [~,x] = ecdf(R); pd_12 = betacdf(x,a_mle,b...

1 month ago | 0

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Answered
How to create a symmetric 2D distribution from a novel distribution
I agree with @John D'Errico that we need more description. Do you just mean that you want to replicate f across another dimensio...

1 month ago | 0

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Box-Whisker Plot with 5 and 95 percentiles and non-symmetric distributions.
It's a bit kludgy, but here is a way to do it by directly editing the XData and YData of the whiskers and their caps. % Set see...

3 months ago | 0

Answered
How to properly read a csv saved cell array.
@Walter Roberson's answer is the canonical one, to be sure. A csv simply cannot store the cell array as you hoped (and naively c...

3 months ago | 1

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Can MATLAB files that were created in the trial version be used in the full version?
No, there should be nothing different about any MATLAB files created in the trial version. All the happens when a license expire...

3 months ago | 1

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Answered
How can I replace the upper off diagonal(super diagonal) and lower off diagonal(sub diagonal) of a matrix?
% Arbitrary size N=5; % Example input A = rand(N); % NxN random matrix disp(A) % Vector to set as the sub- or superdiag...

3 months ago | 1

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How to Filter Rows of Cell Array By Date Range
Here is one way: %Date Range MinDate = datetime('14-Jul-2024'); MaxDate = datetime('17-July-2024'); %Cell Array a = cell(...

4 months ago | 0

Answered
Can't click "Roll The Dice!" problem in intro to matlab cody problems therefor cannot earn badge.
I can't say for sure, but I expect that that problem was deleted from Cody (perhaps by the author). Consider contacting support...

4 months ago | 0

Answered
Adjusting Y-Values in Histograms
Your question is not perfectly clear to me. If you don't want the values binned, I think you more likely want to use the bar fun...

4 months ago | 0

Answered
fitlme different to lmer in R
Disclaimer: I don't fully understand the specifics on why you are seeing what you are. Thinking about my comment about being st...

5 months ago | 1

Answered
ylabel changes position with ax.YAxisLocation = 'origin'
It's a bit kludgy, but rng default hold on scatter(-rand(1,10),rand(1,10),120,'or','filled') scatter(rand(1,10),rand(1,10),1...

5 months ago | 1

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How to determine feature importance using gradient boosting?
The model that is output from fitrensemble has a predictorImportance method for global predictor importance. You can also use s...

5 months ago | 0

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Answered
What happens if I use fitcecoc for a two-class classification, and how is it different from fitcsvm in such a scenario?
Disclaimer: I have not directly tested this idea. The defalt binary learner for fitcecoc is SVM. Therefore, I would expect the ...

5 months ago | 0

Answered
Accessing Fit Coefficients from Curve Fitting
data_fit is a cfit object. You can apply post-processsing steps to this object, as described in this documentation. It sounds l...

5 months ago | 0

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Answered
"Try the New Desktop" icon persists even after uninstalling the add-on (New Desktop for MATLAB (Beta))
That icon is not related to your use of the beta release from the FEX. The New Desktop is always an option now (presumably until...

6 months ago | 2

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Answered
"Arrays have incompatible sizes for this operation" error
It's difficult to know for sure, but I'm guessing those are the variables as they exist in the workspace, outside the function. ...

6 months ago | 0

Answered
I run the code below and expect to get a uniform histogram. It's not. I don't understand why not.
It's because of your choice of 100 bins is tuned to the periodicity of your function in a way that makes it the counts chaotic n...

6 months ago | 2

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Answered
Why I am not getting the same result for an integral of a piecewise function?
You have two mistakes in this code. First, you got the signs wrong on the check. It should be check1 = aux1 - (aux2 + aux3) Se...

6 months ago | 1

Answered
How to save entire MATLAB workspace as a JSON file?
There is no built-in way to do this in MATLAB, and it strikes me as quite difficult to do in a way that is general enough to man...

6 months ago | 1

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Prevent Windows Update from shutting down Matlab session
When you say "stop my simulations from shutting down", do you mean "Have MATLAB pause the Windows update?" As a Mac user, I don...

6 months ago | 0

Answered
how aggregate duraration and sum it in timetable
Here is one way: load("matlab_tt2") TT2.timeOfDay = timeofday(TT2.datt); equalDurationSum = groupsummary(TT2,"timeOfDay",...

6 months ago | 0

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Answered
how to remove variables of a table with a zeros in it
% Example data x = ["a";"b";"c"]; y = [4;5;6]; z = [0;7;8]; tbl = table(x,y,z); % Find variables with a zero hasZero = a...

6 months ago | 0

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Answered
Plotting error bars on grouped bar
You need the XEndPonits property of the bars. % Sample data data = [1.5, 2.3, 3.2; 2.0, 2.8, 3.5; 1.8, 2.5, 3.0]; errors = [0...

6 months ago | 1

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Answered
fitPosterior warning: Why does fitPosterior output a warning when the transformation is a step function?
I would say that a warning could be warranted because perfect separability could be an indication of over-fitting, and that the ...

6 months ago | 0

| accepted

the cyclist

Alden Scientific

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