# the cyclist

### Alden Scientific

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

**Content Feed**

Matrix to Column vector? For ground motion timehistory

% Making a smaller matrix, to see the result more easily gm = magic(3) % The algorithm: gmt = gm.'; %Transpose gm_col = gm...

1 day 前 | 0

Reading a Datetime Column as Numbers Instead of Actual Dates in MATLAB

An alternative solution to my other one, but possibly more expedient for you in working with existing code, would be to use the ...

3 days 前 | 0

| 已接受

Reading a Datetime Column as Numbers Instead of Actual Dates in MATLAB

As it says on the documentation page, use of xlsread is not recommended. You will almost certainly be on a happer road if you r...

3 days 前 | 0

how to Calculate Gravity

You are not indexing into x correctly. Here is one way to fix it: r=8; z=15; x=0:10:100; dp=2400; G=6.67e-11; for i=1:nume...

3 days 前 | 0

| 已接受

Add multiple rows of a matrix in one row.

% Create an input matrix like yours n = 4; M = rand(n,3) % Calculate the sum sumM = sum(M) As you may realize, this is a v...

3 days 前 | 0

| 已接受

Read multiple csv of similar names

Something like this for x = 0:99 filename = sprintf("values%d.csv",x) tbl{x+1} = readtable(filename); end This will...

3 days 前 | 0

| 已接受

What does 1V mean?

I see that that line of code is from the documentation for findpeaks. It presumably does mean volts (from context), but you can ...

4 days 前 | 0

How can get a correlation plot?

Here is one plan of action: Use the readtable function to load your data into MATLAB Use corrplot to get the plot Use the cor...

4 days 前 | 0

what's wrong with my ks test?

My guess here is that this line of code C = wblrnd(100,1); is not doing what you expect. It is generating just one value, from...

5 days 前 | 0

| 已接受

Merging multiple graphs in the same tiled layout

If I understand what you mean, you just need to use the hold function (just after nexttile) to retain plots, rather than replaci...

8 days 前 | 0

.csv using readtable doesn't make difference between the value 1 and 01

% Detect the automatic import options opts = detectImportOptions("23_Time Cards_Practice 1.CSV"); % Change of import type of...

8 days 前 | 1

Plot legend has too many entries

This line yieldline_steel = plot(x1,y1,x,y_steel) plots two objects, the first of which is just a single point.

8 days 前 | 0

| 已接受

How can I modify a list of existing variables programmatically?

You've seen @Walter Roberson's answer, and it is spot-on. That being said, what you want to do is possible, using the appropriat...

9 days 前 | 1

Get exact curve parameters in the fit function

The four decimal places are just the default display value. You can change that with the format command. For example, use format...

9 days 前 | 1

| 已接受

If statement not working for trig quad check

I did not look in detail, but I'd be willing to bet that the problem lies in making comparisons between floating-point numbers, ...

11 days 前 | 0

| 已接受

Mathematical functions across variables

If you just want to know their sum A(1,1) + B(2,1) If you want to add A(1,1) to the value stored in B(2,1) B(2,1) = A(1,1) + ...

11 days 前 | 0

Plot ECDF and histogramm of distribution

Do you mean you want to avoid drawing the additional horizontal red lines? I think you'll need to do something "manually", beca...

12 days 前 | 0

| 已接受

Are "fitrnet" and "fitnet" using backpropagation?

I am not an expert, but my read of the documentation is that all the algorithms used by fitnet, at least, will use backpropagati...

14 days 前 | 1

How to update leap seconds

The file leapseconds.m calls a built-in file to get the list of leap seconds, but you can edit that file to add additional ones....

14 days 前 | 0

Random number generate in an interval

A normal distribution, by definition, has support from negative infinity to positive infinity. You cannot have both a normal dis...

15 days 前 | 0

I can not solve the errors

The direct cause of the error you are seeing is that in the line that gives the error, you are trying to matrix-multiply a 1x3 v...

17 days 前 | 0

| 已接受

Error Code: Unable to perform assignment because the left and right sides have a different number of elements

My best guess is that while your t and v have the same number of elements (which would allow plotting them against each other), ...

18 days 前 | 0

Sorting columns by header names

% Make up a data table N = 3; Column_B_data1 = rand(N,1); Column_A_data1 = rand(N,1); Column_C_data2 = rand(N,1); Column_D_...

22 days 前 | 1

| 已接受

Horzcat Error in 3x3 matrix with multiplication of Matrices

There is nothing inherently wrong with the matrix you specified (as you can see from the code below). You'll need to share more...

29 days 前 | 0

Need help in using trapz to integrate a definite function

trapz is probably not the best way to do this. You could use integral instead c=3*10^8; % speed of light in vaccum h=6.626*10....

29 days 前 | 1

Need help in using trapz to integrate a definite function

Did you read the documentation for the trapz function? It expects either two or three inputs, not the four you provided. I am g...

29 days 前 | 0

Break title into multiple lines?

You can create a multiline tile using either a cell array or a string array. Each element in the array corresponds to a separate...

1 month 前 | 105

| 已接受

Dark Mode editor for MATLAB

UPDATE April 2022 - Please see this Answer for more details on dark mode: https://www.mathworks.com/matlabcentral/answers/167119...

1 month 前 | 18

| 已接受

Fitting 3-d plot

Use meshgrid to make a grid out of your x and y vectors: x = 1:8; y = 1:11; z = rand(11,8); [xx,yy] = meshgrid(x,y); su...

1 month 前 | 0

| 已接受

Slider (legacy) with no room to slide?

I believe this does what you want, for N=1. I frankly have not fully grokked how this works, but figured I'd post the solution ...

1 month 前 | 0

| 已接受