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the cyclist


Alden Scientific

Last seen: Today Actif depuis 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
Pronouns:
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A répondu
How to add a cumulative constant to all values on each row of a matrix, starting from the bottom row and ending at the top row?
There are many ways to do this. Here is one way: % Inputs in = [1 2 3; 1 2 3; 1 2 3]; constant = 0.5; % Algo...

1 jour il y a | 1

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Question


Score transform for RUSBoost in fitcensemble
The documentation for the predict function of fitcensemble lists the score transforms (to convert scores to probabilities) for t...

2 jours il y a | 1 réponse | 0

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How to fix "Error using /, Matrix dimensions must agree"
Take a look at the documentation on Array vs. Matrix Operations. I used element-wise division (using ./ rather than /) in your ...

3 jours il y a | 0

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How to run logistic regression with state variables?
When you specified the model as modelspec1 = 'DefaultFlag ~ Dist_to_DFLT*CreditStateCategory - Dist_to_DFLT:CreditStateCategory...

3 jours il y a | 0

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A répondu
How to fix matrix dimensions
In this expression Q/pi*sigmaz*sigmay*u only pi is going to be in the denominator. Since your expression bears some resemblan...

4 jours il y a | 0

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Building an array of strings that might be empty
If the fields are empty strings, your first syntax will not concatenate them. It will make them into a string array: app.XminEd...

4 jours il y a | 0

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How to convert dates into Julian dates?
Assuming your dates are currently stored as a numeric array, then dates = [20230409 20230414 20230504 20230514 2023...

6 jours il y a | 0

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A répondu
The Tsunami model has need to fixed this problem
Disclaimer: I am not an expert in this! I was not able to track down the exact (Goring & Reichlan) reference from the documenta...

7 jours il y a | 0

Question


Dictionary with key-value pair of string ---> string array?
Using the older containers.Map object, I can map a string to a string array: keySet = ["Jan";"Feb";"Mar"]; valueSet = {["New Y...

8 jours il y a | 1 réponse | 0

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A répondu
why the plot are all zeros?
If you set a breakpoint at the code % Update number of processing tasks on neighbor vehicle numVehicleTasks(j) = numVehicleTas...

9 jours il y a | 0

A répondu
Moving the position of the colorbar label
It is possible to do so. I found out how from this answer. figure surf(1e7*peaks) c = colorbar; drawnow() c.Ruler.Seconda...

14 jours il y a | 1

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A répondu
Minimize the sum of squared errors between the experimental and predicted data in order to estimate two optimum parameters
If you have the Statistics and Machine Learning Toolbox, you can use fitnlm to fit this function. Unless I'm making a mistake i...

15 jours il y a | 0

A répondu
for loop jump an element of an array
You should not use strict equality to compare floating point numbers. Instead, check equality with a small tolerance, e.g. if ...

18 jours il y a | 0

A répondu
how to build a magic matrix manually of even n*n matrix?
The method that MATLAB uses to build magic squares is evident if you enter type magic at the command line.

19 jours il y a | 0

A répondu
How to place the x axis pointing downward and the y axis horizontally?
I'm not 100% certain I understand, but here are steps toward what I think you want. Use some or all of them. First version, I a...

19 jours il y a | 0

A répondu
how to build a magic matrix manually of even n*n matrix?
Yours is an algorithm question, not a MATLAB question. You can find an algorithm for both singly-even and doubly-even magic squ...

20 jours il y a | 0

A répondu
how to fill circle markers with crosses?
I'm guessing it's a bit sloppy for your purposes, but one can overstrike plots with two markers: rng(31) x = rand(7,1); y = r...

20 jours il y a | 2

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A répondu
why do i get 'off', 'Octave:abbreviated-property-match' error warning in eeglab?
The fact that you reached line 202 presumably means you are in an Octave environment, not a MATLAB environment. (I'm guessing th...

21 jours il y a | 0

A répondu
model spec 'polyijk' o=in fitlm does not work as per MATLAB documentation?
I think you are just misinterpreting the Wilkinson notation of the model spec in the output. x1*x2 % note the * for interaction...

24 jours il y a | 0

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A répondu
Plotting 3D functions
You used exp as if it were a constant (e) that is raised to a power. Instead, you should have used it as a function. You also u...

26 jours il y a | 1

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A répondu
How to calculate center of pressure given a 2d array containing pressure data
If the answers to both of the questions in my comment is "yes", then % Example input pressureArray = [1 2 3; 4 5 6; ...

environ un mois il y a | 0

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A répondu
Weird question about the editor...
The line you are talking about is referred to as the "right-hand text limit". You can adjust some properties for it under MATLAB...

environ un mois il y a | 1

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A répondu
Error occurred in fitlm function.
@Walter Roberson surmised correctly, as usual. The fitlm function cannot be used when you have multiple dependent variables. Yo...

environ un mois il y a | 0

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how to convert table to cell to acess data?
The syntax rcs=M(:,4) will give a one-column table. The syntax rcs=M{:,4} will give a column of data of the class that is s...

environ un mois il y a | 0

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Solving an array without for loops
Your question is stated abstractly enough that it is difficult to give specific advice (at least for me). I think it is possibl...

environ un mois il y a | 0

A répondu
Why am I getting the error "Too many output arguments"?
You are confusing MATLAB by using error (a MATLAB function) as a variable name. I changed that variable name to errorVal, and i...

environ un mois il y a | 1

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A répondu
problem with low infinite number
Because their floating-point representations are not exactly equal. You can see that they are not quite equal: load("matlab_Ed...

environ un mois il y a | 1

A répondu
Find a weight matrix and bias which performs the following binary classification
Some MATLAB functionality is not included in basic MATLAB, and you need to purchase a separate "toolbox". The hardlim function i...

environ un mois il y a | 0

A répondu
Extract regexp tokens with regexpPattern
I realize that this is not really an answer to your question, but I just wanted to make sure you are aware that one option is to...

environ 2 mois il y a | 0

A répondu
Blurry Plots -- Using Mac
There are so many possibilities here, and you haven't really provided any specific info except that you are on a Macbook (and or...

environ 2 mois il y a | 0

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