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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
Pronouns:
He/him

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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 day ago | 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 days ago | 0 answers | 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 days ago | 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 days ago | 0

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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 days ago | 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 days ago | 0

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 days ago | 0

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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 days ago | 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 days ago | 1 answer | 0

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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 days ago | 0

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 days ago | 1

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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 days ago | 0

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 days ago | 0

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 days ago | 0

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 days ago | 0

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 days ago | 0

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 days ago | 2

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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 days ago | 0

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 days ago | 0

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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 days ago | 1

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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; ...

1 month ago | 0

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

1 month ago | 1

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

1 month ago | 0

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...

1 month ago | 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...

1 month ago | 0

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...

1 month ago | 1

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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...

1 month ago | 1

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...

1 month ago | 0