Community Profile

photo

the cyclist


4 007 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
I keep getting the error "Array indices must be positive integers or logical values?"
In expressions like this one k2(x2(n,:)-x1(n,:)) MATLAB is trying to index into the variable k2. You need to put in the multip...

environ 19 heures ago | 1

| accepted

Answered
Making the Y-axis a scale of a specific variable
Here is one way: r = 7; m = 50; N = 50; x = rand(N,1); y = m*rand(N,1); figure plot(x,y,'.'); set(gca,'YTick',0:r:ma...

1 jour ago | 0

Answered
how to estimate the distribution of a random variable knowing the histogram?
Do you have the underlying data, or only the counts from each bin? Were you hoping to find a particular functional form (e.g. a...

1 jour ago | 0

Answered
Index exceeds the number of array elements (0)
Everywhere that you wrote zeros(i:1) I think you meant zeros(i,1)

1 jour ago | 0

Answered
Curve Fit data using FIT
I used nlinfit from the Statistics and Machine Learning Toolbox. Here is the code, and the resulting plot: xy = [ ... 1 317.3...

1 jour ago | 0

Answered
Extracting certain values from a cell array with nth columns containing double arrays
mC = cellfun(@(x)max(x(:,3)),C)

2 jours ago | 0

| accepted

Answered
Finding length between two array elements.
The RunLength utility from the File Exchange might be handy. Run it in a loop over each column.

3 jours ago | 0

Answered
Draw vertical lines on a plot
If you have R2018b or later, you can use the xline command. If you have an earlier version, you can use the line command (which...

3 jours ago | 0

Answered
Beginner's question about data plot
Try this instead plot(time,Enable_d,'.','MarkerSize',32) This code will plot individual points, without a connecting line.

3 jours ago | 0

Answered
find max of vector
m = max(v); idx = find(v==m);

4 jours ago | 0

Answered
How can vectorize the below codes?
Well, not vectorizing it, but if you preallocate etas and phis with these line: etas = zeros(262144,2); phis = zeros(262144,2)...

4 jours ago | 0

| accepted

Answered
Dear friends, the long matlab command that I have written is error. I want to be spelled the same way but without error.
Do it like the second example on this documentation page about continuing long statements on multiple lines.

6 jours ago | 1

| accepted

Answered
Simple if statement also executes if condition not met - What am I doing wrong?
I ran the following code: dist_psd = [1 1 1 1 NaN]; time_psd = [1 1 1 NaN NaN]; for i = 1:length(dist_psd); if (isna...

8 jours ago | 0

| accepted

Answered
update vector with nubers from another vector
A = [ 2 4 6 10 15]; B = [2.43 2.3 12 5.1]; [~,idx] = min(abs(B'-A),[],2); B = A(idx)

8 jours ago | 1

| accepted

Answered
Sorting numbers in an array without sort function
if all(diff(X)) >= 0 Also, rather than defining the finished variable, you could have just made that the condition for the whil...

9 jours ago | 0

Answered
i want to know whats is the problem in this code during running
Are you trying to just paste that code into the command line, and running it? Instead, you should save that function code into ...

9 jours ago | 0

Answered
how to remove zeros from the matrix?
I think this does what you want: % Replicate A into B B = A; % For the even-numbered rows, circularly shift the elements B...

11 jours ago | 1

| accepted

Answered
Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is 2-by-2.
In the line of code giving the error: A(i,j)=(0.5)*(c)*(Cla).*(C(i,j))+k(i,j) you are using the full matrix c. Maybe you wante...

11 jours ago | 0

Answered
Detecting length and number of occurrences in a logical array
Download Jan's RunLength utility from the File Exchange. It will do exactly what you want. array1 = [0 0 0 0 0 1 1 1 1 0 0 1 1 ...

11 jours ago | 0

| accepted

Answered
Dark Mode editor for MATLAB
The best way that I know of to do this is to use MATLAB Schemer from the File Exchange.

12 jours ago | 0

| accepted

Answered
How to terminate the loop
Due to floating-point error, it may be that the condition if p_f_BM == 1 is not exactly met. With floating-point numbers, it's...

12 jours ago | 0

| accepted

Answered
If I work on a different computer everytime, is there a way to save my shortcut codes (ie all the plot formatting stuff that's always the same) on my math works account so I can pull it up on Matlab?
I think you could probably use MATLAB Drive to do what you want. You could also store your code in a git repository, including ...

12 jours ago | 0

| accepted

Answered
What is the s_rot() function ?
That is not part of base MATLAB or any MathWorks toolbox, as far as I could find. Googling on "s_rot" matlab found a few hi...

12 jours ago | 1

| accepted

Answered
machine learning for medical data analysis
That is a function from the Image Processing Toolbox. You should check to see if you have that toolbox installed and licensed. ...

13 jours ago | 0

| accepted

Answered
Not Converting ASCII to DECIMAL
c = b-'0'

13 jours ago | 0

Answered
sorting array without min and max
Take your pick: Sorting algorithms Enjoy this video as well.

14 jours ago | 0

Answered
Count number of times value appears in column
% Parameterize the max value, for convenience V = 296; % Some simulated data FinalRanking = randi(V,1000,V); % Prealloca...

14 jours ago | 1

| accepted

Answered
Generating random number for the Inverse Gaussian distribution
If you have the Statistics and Machine Learning Toolbox, then you can generate N random numbers with N = 1000; % Set this to th...

14 jours ago | 0

| accepted

Answered
Understanding standard deviation code
As explained clearly in the documentation for std: The "0" specifies that the standard deviation will be weighted by sqrt(N-1),...

14 jours ago | 2

Answered
Undefined function 'niftiread'
niftiread is a function from the Image Processing Toolbox. Do you have that toolbox installed and licensed?

14 jours ago | 0

Load more