Community Profile

photo

the cyclist


Last seen: Today
4.430 total contributions since 2011

Data scientist at Cohen Veterans Bioscience; 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.)

Contact

the cyclist's Badges

  • Scavenger Finisher
  • Master
  • Thankful Level 4
  • 36 Month Streak
  • Likeable
  • Famous
  • Quiz Master
  • First Review
  • First Submission
  • Revival Level 3
  • Knowledgeable Level 4
  • First Answer
  • Puzzler
  • Speed Demon
  • Creator

View all

Contributions in
View by

Answered
Put specific name in file via writematrix
You need to concatenate the character arrays. Here is one way to do that: str='2020' writematrix(A,['output',str,'.xlsx'])

4 días ago | 0

| accepted

Answered
Displaying a group of vectors on separate lines
You can use a semicolon to concatenate vertically [a; b; c]

4 días ago | 0

Answered
Issues converting a Cell to a numerical array
Here is one way that may work for you: C = {1, 3, 7, 7, 'a'}; N = cell2mat(C(cellfun(@isnumeric,C)))

6 días ago | 0

Answered
3D Matrix Multiplication
You can do it straightforwardly with a for loop: % Some made-up input data A = rand(3,1,4); B = rand(3,3,4); [mA,nA,pA] = ...

6 días ago | 0

| accepted

Answered
fitlm() with 0 intercept function returns different values for R2 betwen MATLAB 2020a and 2020b?
Interesting. The 2020b result seems to be correct, based on the formula using sums of squares. (See, e.g. the definition on wiki...

7 días ago | 1

| accepted

Answered
Creating a Histogram of Letter grades converted from number grades
I'm sorry to say that the approach in your code is so misguided, that it is probably not worth debugging it. You need a differen...

7 días ago | 0

Answered
how to get random pair ?
How are these pairs currently stored? This seems equivalent to just choosing a random number from 1-6, so you could do idx = r...

8 días ago | 0

Answered
How to plot function with variable input like shown in figure?
I didn't fully understand what you are trying to do, but the fplot command might be useful.

9 días ago | 0

Answered
Producing a NaN only where there is a NaN, zero otherwise
Second attempt ... X = [-inf, -1, -eps, 0, realmin, 2, 1+i, pi, flintmax, realmax, inf, NaN]; broken = @(x) 0./(isnan(x)-1); %...

9 días ago | 1

Answered
Producing a NaN only where there is a NaN, zero otherwise
First attempt: X = [-inf, -1, -eps, 0, realmin, 2, 1+i, pi, flintmax, realmax, inf, NaN]; broken = @(x) 1./((isnan(x)-1)/0); %...

9 días ago | 1

Answered
How do I remove NaN's from my data?
If your numeric vector is called "x", then x(isnan(x)) = []; will remove the NaN values.

9 días ago | 0

Answered
Plot of 4D coordinates
You may be able to find something you can adapt at the MATLAB Plot Gallery.

9 días ago | 0

Answered
How to get the first value in a set of array that is bigger than the first few values?
Because x and y are not the same length, I'm not sure how to make the "correspondence" between them. However, this code snippet ...

10 días ago | 1

Answered
Using if condition store values in an array
If I understand you correctly, this does what you want. (It doesn't directly use "if", but does the job via logical indexing ins...

12 días ago | 0

| accepted

Answered
Sort an Array with sortrows ( ) with two columns
See my answer (and other comments) to this very similar question. (As with the comments above, the premise is that the displayed...

12 días ago | 1

Answered
How to make slope 1in fitlm?
I don't believe you can do it with fitlm, but you can with fitnlm: % Set seed for reproducibility rng default % Make up som...

12 días ago | 0

| accepted

Answered
Multiplying a Matrix with every column of another matrix
Do you mean you just want to do standard matrix multipication? C = A * B Or did I misunderstand?

13 días ago | 1

| accepted

Answered
How to remove this error?
We can't really answer that for you, because we need more information. Suppose x = [1 2 3 4]; y = [5 6 2 3]; If I want to pl...

13 días ago | 0

Answered
What is prodofsize?
It is mentioned in the "Backward Compatibility" section of the documentation of cellfun, although there doesn't seem to be any i...

13 días ago | 0

| accepted

Answered
Array indices must be positive integers or logical values error
You need X = (2*r2*((cosd(0)*cosd(theta2)))); instead of X = (2*r2((cosd(0)*cosd(theta2)))); (Note that I used r2* instead o...

14 días ago | 0

Answered
How to insert multiple element after specific numbers in a vector?
Here is one way % Original logical vector input L = logical([1 0 1 1 0]); % The numbers to be inserted oneNum = 6; zeroNu...

16 días ago | 0

Answered
Addition in 3D matrix
% Define some pretend data, the size of your original matrix M = rand(62,50,341); % Intervals interval = [8,30,31,31,30,31,...

16 días ago | 0

Answered
Shifting columns in matrix Matlab
Slightly simpler version of @Nora Khaled's idea. It will also generalize to an (N-1) X N array in a way that I believe makes sen...

18 días ago | 0

| accepted

Answered
Fitting the data to power law using least square method
Here is code that will do the fit in the original space, without applying the log transform first: % Load the data data = read...

19 días ago | 0

| accepted

Answered
Why is xcorr getting this very simple case "wrong"?
I didn't figure this out with certainty, but if you take a look at the "More About" section of the documentation for xcorr, it m...

19 días ago | 0

Answered
Fitting the data to power law using least square method
I would solve this by first applying a natural log transform to both sides of the equation, which then gives you a linear equati...

19 días ago | 0

Answered
Error - Index in position 1 exceeds array bounds (must not exceed 10)
I think you want for row = 3:size(x1,1)-1 end instead of for row = 3:size(x1,1) end so that you don't try to acc...

21 días ago | 0

| accepted

Answered
Convert cell array to matrix with two columns and sort rows by first column value
I think this does what you want: % Set RNG seed, for repeatability rng default % Make up some data Cell_x = {rand(13,2),ra...

21 días ago | 0

Answered
How to obtain an array of constant values from vector valued anonymous functions
f=@(x) 3.5 * ones(size(x)); v=0:10; y=f(v)

21 días ago | 1

| accepted

Answered
why I'm getting error " Array indices must be positive integers or logical values."
You need the multiplication sign after Patm: func_atm_pressure=@(Z) P-Patm*(1+((B*Z)/Tatm))^(g/(R*B));

21 días ago | 0

Load more