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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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Answered
Performing Chi Square Test
The crosstab function calculates the table from raw data. It does not expect the table itself as input. After an admittedly bri...

1 day ago | 0

Answered
Is there a Matlab function to convert a plot into a matrix or image?
I assume you mean that you want to do it programatically, as opposed to interactively. I'm a creature of habit, and I generally...

2 days ago | 0

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Answered
How to calculate the minimum distance between two points?
I am not absolutely certain that this code is equivalent to what you wrote, because I cannot test it on my local machine. (I do ...

4 days ago | 0

Answered
K-means clustering output matrix C (represent centroid locations)
You have 8 centroids, each of which is a point in a 10-dimensional space. Each row gives the 10 coordinates needed to locate tha...

4 days ago | 0

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Answered
How to calculate the minimum distance between two points?
I doubt that this is the main issue slowing down the code, but you should preallocate the memory for your output array. Growing ...

4 days ago | 0

Answered
Adding multiple variable contents in a single variable
If your data are already stored in dynamically named variables, then I think your only recourse is to use eval to do this task: ...

7 days ago | 1

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Answered
simple regression analysis issue
The method you used does not include an intercept, so your fit is forced to go through the origin. Try this instead (which is al...

10 days ago | 0

| accepted

Answered
Reshape matrix with averages of 4 elements in each row
Here is one way: n = 4; A = [ 0 2 2 4 0 6 4 6 1 1 2 8 0 0 4 0 9 9 2 8 0 0 0 8]; tmp = movmean(A,[0 n-1],2); B ...

14 days ago | 0

Answered
Why scatterplot shows one point in different color and rest all the points are different?
If I have interpreted your code correctly, you have plotted the x-y data, just in different groups. Your figure actually has fou...

14 days ago | 0

Answered
Problems clustering with kmeans
I think you might have success if you try the DBSCAN algorithm instead.

25 days ago | 0

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Question


Write file(s) with all properties of a MATLAB model
Suppose I have built a machine learning model in MATLAB. It has a list of properties (and underlying property data) that encapsu...

27 days ago | 1 answer | 0

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answer

Answered
i have one dimensional array and i want to move every non zero element oh that array to exchange position with every zero in each iteration.
I think this does what you want: % Input data a = [1 2 3 4 0 0 0]; % Find the indices of the non-zeros and the zeros idxNo...

27 days ago | 0

Answered
Finding values with the same index in two arrays
RowCol1 = [17.487504; 17.487591; 17.487596; 17.487605; 17.487617]; RowCol2 = [16.113; 16.116; 16.244; 17.487591; 17.487596; 17...

1 month ago | 0

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Answered
Selecting Specific Elements in a Matrix Using Group
Height = [62; 65; 63; 70; 58; 70; 73]; Gender = [1; 1; 1; 2; 1; 2; 2]; % where 1 is female and 2 is male data_table = [Height(...

1 month ago | 1

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Answered
how can I classify the loads based on Bagging decision trees and compare it with actual data?
I have not gone through your whole code, but I loaded your MAT file and then ran C = confusionchart(Actualdata.Loads,Preddata.L...

1 month ago | 0

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Answered
I want to get the difference between the present number and the previous number for 1000 set of data from the plot.
a = [2 3 5 7 11]; a - a' % All possible differences between pairs of elements of a

1 month ago | 1

Answered
How can I create a 16 round for loop in this problem?
Use a cell array to store the values: for k = 1:16 Key{k} = randi([0,1],[1,4]); In{k} = randi([0,1],[1,4]); Cip...

1 month ago | 0

Answered
Problem with index in position 1 exceeding array bounds in PSO algorithm
x_min and x_max are 1x2 vectors, but in the loop you try to access a second row of those matrices, which do not exist. I'm not ...

1 month ago | 0

Answered
请问怎么让具有两列元素的矩阵按照行之和的大小顺序排列?。
A=[1,2; 6,4; 2,7]; [~,sortingIndex] = sort(sum(A,2)); output = A(sortingIndex,:)

1 month ago | 0

Answered
Mean and Standard deviation table
You can use the groupsummary command.

1 month ago | 0

Answered
Intersect() with with repetition
I frankly have not quite figured out the logic of what you want as output, but I'm pretty sure that you can construct what you w...

1 month ago | 0

Answered
two for loops in parallel
If I understand you correctly, you don't need two for loops, and this will do what you want M=5; x=0; A=[1 4 7 10 13 16 19]; ...

1 month ago | 0

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Answered
24 Hours for run my for loop
Without seeing your code, it is impossible to know specifically what are possible approaches to speed it up, but two possibiliti...

1 month ago | 0

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Answered
How can i interpolate 1-D data, whit y especified values?
Unless I'm missing something, it sounds like you just want to interpolate x from y, instead of y from x: x = [1 2 3]; y = [1 4...

1 month ago | 0

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Answered
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...

2 months ago | 0

Answered
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...

2 months ago | 0

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Answered
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...

2 months ago | 0

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Answered
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 -...

2 months ago | 1

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Answered
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 months ago | 1

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Answered
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 months ago | 0

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