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Alden Scientific

Last seen: Today | 自 2011 起处于活动状态

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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
Spoken Languages:
English
Pronouns:
He/him

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Why does this code give error?
It's because randi(1,Nb) generates an Nb*Nb array. You need randi(1,Nb,1) as below clear;clc; fc = 3e8; Nb = 1000; %% ...

3 days 前 | 0

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plot legend shows wrong linespec
The syntax you are using created a plot with 402 "lines". The first 401 are red, and the last one is blue. load('data') % I di...

3 days 前 | 1

已回答
want to use output matrix obtained for every iteration of a for loop in another for loop.
Here are two possibilities: % Save into cell arrays nsmall = 4; mcell = cell(nsmall,1); for k = 1:nsmall mcell{k} = ran...

4 days 前 | 0

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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...

5 days 前 | 1

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提问

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...

6 days 前 | 0 个回答 | 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 ...

7 days 前 | 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...

7 days 前 | 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...

8 days 前 | 0

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已回答
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...

8 days 前 | 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...

10 days 前 | 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...

11 days 前 | 0

提问

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...

12 days 前 | 1 个回答 | 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...

13 days 前 | 0

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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...

18 days 前 | 1

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已回答
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...

19 days 前 | 0

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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 ...

22 days 前 | 0

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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.

23 days 前 | 0

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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...

23 days 前 | 0

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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...

24 days 前 | 0

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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...

24 days 前 | 2

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已回答
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...

25 days 前 | 0

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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...

28 days 前 | 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...

1 month 前 | 1

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已回答
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 前 | 0

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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...

1 month 前 | 1

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已回答
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 前 | 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...

2 months 前 | 0

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已回答
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...

2 months 前 | 0

已回答
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...

2 months 前 | 1

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已回答
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...

2 months 前 | 1

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