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

Statistics

All

View badges

Content Feed

Answered
comparison between a string/or cell and categorical data
Your method works for me: Trading = categorical({'As is';'bla'}); B='As is'; B == Trading(1) You did have a lower-case "b"...

ongeveer 7 uur ago | 0

Answered
I can't draw the vector field
The problem is the Inf values in u and v. Removing them: [x, y] = meshgrid(-0.9:0.3:0.9, -0.9:0.3:0.9); R1 = (x.^2 + y.^2).^.5...

ongeveer 7 uur ago | 0

Answered
3D Histogram of 50x50 data
You can make this style of plot using the histogram2 function.

1 dag ago | 0

| accepted

Answered
Variables corresponding with NaN won't graph
Without seeing your code or your data, it is difficult to give specific advice. But the gist would be something like this: iden...

2 dagen ago | 1

Answered
cross-correlation of multivariate data to differnt lag numbers
Try the xcorr function.

3 dagen ago | 0

Answered
Predictor and Response Variables must have same length error
fitnlm expects column vectors as input, not row vectors. Rows are the observations, and columns are variables. y = [0 0 ...

3 dagen ago | 1

| accepted

Answered
Plotting different sized vectors
Here is one way. If you have many participants, I would generalize this a bit differently (e.g. by storing participant vectors i...

3 dagen ago | 0

| accepted

Answered
Help with principal component analysis of FTIR spectra
Frankly, I don't see why you would use PCA for this analysis. I expect there are some specialized statistical tests for determin...

3 dagen ago | 0

Answered
Retime function creates new rowtimes going back to 1899
You have a few dates from 1899 in your input data load CO2_TT.mat [minDateTime,indexToMinDatetime] = min(CO2_TT.DateTime) C...

4 dagen ago | 0

| accepted

Answered
How to create curved arrows by giving tail and head coordinates?
It looks like the circular_arrow submission in the File Exchange might do what you want. I suggest downloading that function and...

4 dagen ago | 1

| accepted

Answered
How can i find indices of constant elements between 2 arrays?
Do you mean the non-zero elements that are the same between the two arrays? A = [1 2 0; 0 1 0; 5 0 8]; B = [1 3 0; 0 4 0; 5 0 ...

4 dagen ago | 0

| accepted

Answered
how to find average curve of n curves? n=3 in this case
Here is how to get at the underlying data, from the figure file. open("fig3b_XveKu_7.9%_S_parameters_VNA_CST_S21.fig") h = f...

5 dagen ago | 0

Answered
Extracting from boxchart function the median, quartiles, and whisker data.
As you may know, but just in case you do not, there is also the boxplot function, which has more flexibility than boxchart.

5 dagen ago | 1

Answered
How can I save "alpha" and "beta" parameters as double using fitdist command?
I'm not sure what part is giving you trouble. Here is how to pull the parameter values out of the distribution object. (The full...

6 dagen ago | 0

| accepted

Answered
What does this command line mean? (matrix A =[A t])
Square brackets can be used to concatenate arrays.

11 dagen ago | 0

Answered
Send Emails from GUI
I don't know the answer to your question, but you might have better luck using the MATLAB-supplied sendmail function, rather tha...

12 dagen ago | 0

Answered
Multiply column by a number
Here is one way: varList = ["Var7","Var8","Var9"]; tbl{:,varList} = tbl{:,varList}*15;

12 dagen ago | 0

Answered
How do I extract data from a matrix with a specific column value and place into a row in a new matrix.
Here is a straightforward method, assuming equal number of duplicates in the first column. % Input M = [1, 25 3, 33 3. 45 2...

14 dagen ago | 0

Answered
How can I fill the area between these lines and curves?
You can use the fill function.

14 dagen ago | 1

Answered
Delete columns if sum of a group of 10 columns is zero
Here is one way. for nc = 123:-10:3 colIdx = nc:(nc+9); if sum(Data1(15:end,colIdx),"all")==0 Data1(:,colIdx...

15 dagen ago | 0

| accepted

Answered
two x-axes, one above and one below, inverted
This documentation explains how to do multiple axes. And then you'll need to set the XDir property of one of the axes to "rever...

16 dagen ago | 0

Answered
Fit nonlinear regression model
Answering your main question: beta0 is the initial guess at the coefficients of the fit. In your case, MATLAB is expecting a vec...

16 dagen ago | 0

| accepted

Answered
Why there is a Invalid Expresssion error in my fit function?
Your code works: n = [1433;2700;1000000]; s = [1170.98;780.65;390.33]; f= fit(n,s,'power1') Did you perhaps try to spread th...

16 dagen ago | 0

| accepted

Answered
Ordering of an array based off conditions
% Input data tmp = {'1e2','1h4','1t0', '3g2', '3g3', '3g4', '3q0', '3q1', '3q2'}; letter_list = {'t','q','e','g','h','i','j'};...

17 dagen ago | 0

| accepted

Answered
How can I set the NaN values to black in a pcolor plot?
Set the axes background color to black: % Generate sample data data = rand(10, 10); data(3, 3) = NaN; % Set a specific value...

18 dagen ago | 1

| accepted

Answered
extract statistically independent words
You can do n-gram processing with the Text Analytics Toolbox.

19 dagen ago | 0

Answered
problem inconsistent dimension arrays
We can't run your code because we don't have all the inputs to do so. I suggest using the debugger to halt your code at that lin...

19 dagen ago | 0

| accepted

Answered
In order to automate the fitlm command I need to select numerical data from a matrix, and matching variable names from another character array. I get an error on fitlm command
One way that is close to the syntax you used is this: lm=fitlm(tbl,sprintf('%s ~ %s',erase(strtrim(VarNames(OriColumns(i,1),:))...

19 dagen ago | 0

Answered
I would like to delete the black line in the boxes
Those are the whiskers, in the compact style. You can set their length to zero. (I also removed outliers, to show it more clearl...

20 dagen ago | 0

| accepted

Answered
A line does not appear when I plot
The way you have coded this, both h and Temp are going to be scalars (single values) after the loop completes, so there is only ...

21 dagen ago | 1