Community Profile # the cyclist

### Alden Scientific

Last seen: 1 day ago 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

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Setting up Matrix in a Different way
This does what you want via a straightforward loop. I expect there is a slicker way to do this. A=[1 10 12; 2 12 3; 3 ...

3 hours ago | 0

Unrecognized function or variable 'x'.
Because you have the code x = linspace(-2.*pi,2.*pi); the value of x that comes in via the input is never used. That is why yo...

3 hours ago | 0

Can my x-axis have varying scales for certain ranges of values?
Here is a simple example: x = 1:10; y = 2*x; figure plot(x,y) xtick_loc = [0:0.5:2 3:2:7 8:0.5:10]; set(gca,'XTick',xtic...

2 days ago | 0

Creating a plot where my x and y values are defines by equations of another variable
Here is a simple example. z = 1:10; x = 2.*z; y = 3.*z; figure plot(x,y) xlabel('x') ylabel('y')

2 days ago | 0

Why won't my plot graph a line?
Because you defined x as a looping variable, after the loop is completed, x is equal to just the last value in the loop. Instead...

2 days ago | 0

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Check whether values of a certain column of a matrix is between two values
OK, still trying to understand everything, but I think this does what you want: % Sample input BUS(:, 8) = [2;2;2]; BUS(:,12)...

4 days ago | 0

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Check whether values of a certain column of a matrix is between two values
I think you intended volmax<0 & volmin <0 rather than volmax<0 | volmin <0 because you want to meet both conditions ("AND"),...

4 days ago | 0

Select only determined rows in a matrix
% First matrix A = rand(200,2); % New matrix B = A(10:10:end,:); % This will start with the 10th row. You could do B = A(1:...

6 days ago | 0

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I need to find the the value of one variable against the other How can I do that ?
You can use the interp1 function: % Input data A = [5464.8 9075.5]; B = [0 1]; % Some new value of B: B_new = 0.7; % I...

6 days ago | 0

How can i make a dinamic row in a matrix or a cell?
In MATLAB, there cannot be an "empty" spot in a numerical array. So, you need to decide what you want in that spot. Sometimes a ...

6 days ago | 1

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Error this answer is NaN, in my runge-kutta code
Your code is long and complicated. It also has lots of unnecessary complication in it. For example, instead of Lambda1 = zeros(...

6 days ago | 1

Repeated Measure ANOVA 2x2
I have experience building mixed effects models in MATLAB, but I have not used ANOVA (repeated measures or otherwise). Therefore...

6 days ago | 1

Show temperature difference (delta) between 2 temps in a graph
Here is an example similar to what posted in my comment, but added line and text: rng default x = rand(1,5); mean_x = mean(...

7 days ago | 0

how to combine two array of cells into one cellwise
A={ [2,3 ; 2,7] [3,2 ;3,4 ;3,8] [4,3 ; 4,5] [5,4 ; 5,10] }; B={ [2,3,4 ; 2,3,8 ; 2,7,8 ; 2,7,12] [3,2,7 ; 3,4,5 ; 3,8,7] [4...

7 days ago | 0

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Sorting numbers randomly in a specified range without changing their positions
% Input A = [5 8 8 4 0 0 10 10 2 2]; % Find the pool of numbers that are available to fill % (because they don't appear in ...

8 days ago | 0

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Random matrix with no repeats in rows and columns.
I believe this does what you want. % Set the random number seed, for reproducibility rng default % The pool of random numbe...

8 days ago | 1

Not directly answering your question, but a different (and more conventional) approach would be to move the limit annotations ou...

9 days ago | 0

How to multiply row of matrix A with column of matrix B?
If @Adam Danz is correct that you actually want to multiply all the elements of one column of A with one row of B, then % Defin...

9 days ago | 0

Swapping my matlab student licence over
You need to deactivate the installation on the old computer.

9 days ago | 0

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Why does it give me a problem stating that, Index must not exceed 1?
When you define del_ZS1 in the initial for loop, it is not a vector. It is a single, scalar value. When you try to do del_ZS1(...

9 days ago | 0

How do can I use every number in my loop?
% Set the random number seed, for reproducibility rng default % Create the x data x = rand(3,5); % Mean of all the x dat...

9 days ago | 0

How to get the indices from a matrix and apply it to vectors?
Here is how you can do that, using my small example: rng default HIGH_WIND = 0.96; % <------ CHANGE THIS TO 15 lat = ran...

10 days ago | 0

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My plot is not showing a line?
Here is a modified version of your code, where I changed Time to t (in the assignment of S), and I plotted your data as large in...

11 days ago | 0

How to make the color of the filled part transparent
Use the FaceAlpha property, with a value near zero: figure ax1 = axes; ax2 = axes; x=linspace(1,10,10); y=sin(x); plot(ax2...

13 days ago | 0

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Not enough input arguments
You need real(ym) instead of real (ym)

13 days ago | 0

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How can i define a m by n symbolic matrix?
Matrices where the size is not predetermined cannot be defined in MATLAB. Source: this question/answer and the one it points to....

15 days ago | 0

How do I round this datetime to the nearest 0.1 second?
This is awkward, but it works. Guessing there is a better way. % Define original datetime input dt = datetime('01-Oct-2020 04:...

15 days ago | 0

problem looping through arrays
I think you intended if mod(M(i,j),2) == 0 rather than if mod(Q(i,j),2) == 0 Regarding the warning about Q changing size, yo...

16 days ago | 0