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# the cyclist

##### Last seen: Today
4,203 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.)

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select a specific element of each matrix in a string
firstElementOfEachCellOfU = cellfun(@(x)x(1,1),U);

1 day ago | 0

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Using the find() function to find only the first number greater than the given number.
Here is one way: % The threshold number number = 2; % Your cell. (Don't name it "cell", which is a MATLAB keyword.) C = {[...

2 days ago | 0

Fill area between plot and the 0-line?
You can use either the fill or patch command. See the examples there for guidance.

2 days ago | 0

Finding pair values in a matrix
If my speculation in the comment above about what you want for z2 is correct, then z2 = unique(sort(z,2),'row')

2 days ago | 0

A function that outputs the mean and standard deviation
The reason you are displaying 100 results is that you do not have a semicolon after this line: moy = (A(i)-M)^2 so the resu...

2 days ago | 0

Error bars on categorical bar plot
Call errorbar with this syntax instead: errorbar(x(1),y(1),SEM(1),'k','linestyle','none'); errorbar(x(2),y(2),SEM(2),'b','line...

3 days ago | 0

What is the variable names of c in Kruskal-Wallis test documentation?
Perhaps you did not scroll down to this section of the documentation of multcompare, which explains what the columns are.

4 days ago | 1

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Counting and removing rows with the same numbers in a particular order
Pending answers to the questions in the comments, something like this will work on your input as written: A = [1234;4123;3412];...

6 days ago | 0

combining matricies with common values
I'm not certain this is what you want, but this is my best guess: [tf,idx] = ismember(b(:,1),a(:,2)) complete = [a(idx,2) a(id...

10 days ago | 0

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how to calculate mean without considering the zero in matrix
Presumably the easiest way to do what you want is to use the nanmean function from the Statistics and Machine Learning Toolbox, ...

14 days ago | 0

Parsing a multi cell array into character vectors to place in table
Here is a method, using regexp to identify where the separators are, and then for loops to use the separators as the "fenceposts...

14 days ago | 0

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Distributing a cell array into another
Here is a straightforward way: A = {'Category1', 'Category2'}; B = {'Mon', 'Tues', 'Wed', 'Thurs' 'Fri', 'Sat', 'Sun'}; nA...

15 days ago | 0

Valid_date function
This syntax 1 <= day <= 30 does not check if day is between 1 and 30. You need to do that as two separate checks: (1 <= day) ...

15 days ago | 0

How do I create a matrix with all binary combinations?
There's an incredible obfuscated hack for this: N = 4; dec2bin(0:2^N-1)' - '0'

20 days ago | 1

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how to make a plot from my function results?
Here is an example using a for loop that calculates and plots the Gregory-Leibinz approximation to pi: n_max = 100; pi_appro...

20 days ago | 0

How do i type this long equation?
It is not possible to convert that expression to valid MATLAB syntax, because you have some mismatched parentheses. Unless I ma...

20 days ago | 0

Structures with multiple, conntected anonymous functions
Are you sure that y didn't exist in the workspace when you defined the structures? Because in a fresh workspace, S.x = 3 S.y =...

21 days ago | 0

How to reshape matrix in this way?
N = reshape(M.',2,6).'; You need to transpose first (and later back again), because the reshape command works down the columns....

21 days ago | 2

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Multiply values by the number of days in each month
C = rand(41,35,360) ; % random 3d data daysNonLeap = [31; 28; 31; 30; 31; 30; 31; 31; 30; 31; 30; 31]; daysLeap = daysNonLe...

22 days ago | 1

Adding elements to a 2D array
C = [A; B]

22 days ago | 0

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How do you use multiple indices to separate data and put in a structure?
I was pretty sure there was a simple vectorized way to do this, but it did not come to me right away. But then I remembered it: ...

22 days ago | 1

How do you use multiple indices to separate data and put in a structure?
Here's one straightforward way % Make up some data and indices A = rand(3672,10); B = 1:2:600; % Preallocate the cell arra...

22 days ago | 1

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Why Greek leters cannot be typed in legend?
What do you get if you do L = legend('EXP','CFD simulation r k-\epsilon','Inlet position','Location','Northeast'); L.Interpret...

1 month ago | 0

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fprintf to print to both file and command window
I doubt it. I'm not sure what your goal is, but it would certainly be trivial to write your own small function. Something like ...

1 month ago | 0

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Loops to create multiple graphs
The gross way, with dynamically named variables: CH01 = [3 5]; CH02 = [7 11]; for ii = 1:2 varString = sprintf('CH%02d...

1 month ago | 0

Unrecognized function in reinforcement learning toolbox
Do other functions from the toolbox work? Does the output of >> ver list the toolbox? If you go to the License Center, and s...

1 month ago | 0

How to write for loop to subtract the mean from each data point of the variables?
Why use a for loop? x - mean(x)

1 month ago | 0

How do I calculate PMF with the random numbers I generated?
The PMF is the number of times each value was obtained, divided by the total number of rolls, right? I think you should be able...

1 month ago | 1

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A/B testing
See this documentation page for the large number of hypothesis-testing functions available in the Statistics and Machine Learnin...

1 month ago | 0

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