Community Profile # the cyclist

### Alden Scientific

Last seen: 1日 前 2011 以来アクティブ

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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i want to create a 2 dim matrix which creates 1000 rows vs 1000 columns which will look like a table, if the prime number occur output 1 in the cell and if not prime output 0
I think this does what you want. I used 100 numbers in a 10x10 array to illustrate. Just change N to 1000. N = 10; Prime_matri...

1日 前 | 0

Replace only values in y axis
Does this do what you mean? rng("default") % Data to plot x = 1:10; y = rand(1,10); % 11 arbitrary numeric labels for y...

2日 前 | 0

convert a x y z data(1D) to MxN matrix without having NaN values in Z matrix?
If you are using interp3 (or related functions), extrapolated values will automatically be set to NaN, for some interpolation me...

2日 前 | 0

How to iterate until a point satisfies a certain condition?
You need to code the condition into a while loop. (I didn't fully understand the condition, so I can't be more specific than th...

6日 前 | 0

Changing data from a list to a matrix
Can we make a simplified example, to understand what you mean? Suppose you just have 3 columns of data, and your function is f(x...

7日 前 | 0

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How to fill surface with interpolated values?
Your code does not seem to have a call to interp2, so I'm not sure what might have gone wrong there. If you did not specify an ...

8日 前 | 0

add a row of summary statistics in a table
Here is one way: % The table T = table([10;5],[17;18],'VariableNames',{'visitor','temperature'},'RowNames',{'New York','Chicag...

9日 前 | 0

How can decimals not be rounded
Here is one way: roundTo = 2; % Set this value float_number = 5.126; % User's value % Algorithm roundToPower = 10^roundTo;...

12日 前 | 1

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Why I am getting Same p-value, h and stats while using Wilcoxon Rank test for 7 different data set?
That test statistic only depends on the count and relative ordering of the respective set elements. In your case, it looks like ...

14日 前 | 0

find the best linear regression model using stepwiselm
First, I feel obligated to mention that stepwise regression is often criticized as a technique. This wikipedia article discusses...

17日 前 | 0

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Error usin .* Too many output arguments. How to save three variables at the same time in a loop?
Given the image of the calculation you posted, I think you want matrix multiplication, not elementwise multiplication: [V01(a,1...

19日 前 | 0

Randomly generated numbers do not change themselves with each iteration
Can you post your code? This miniature version of what you described seems to work. rng default format long for l = 1:4 ...

19日 前 | 0

check each element of random vector c=[0, 1, 0, 1,.....n] one by one if value of current element is 0 and previous element is 0 perform this action otherwise another action.
I didn't fully understand what you are trying to do with your code, but I think the following will help you. To find all the lo...

19日 前 | 0

How to extract matches from results of a regexp match
Even when using a single character array input along with the 'match' option, MATLAB has to return outputs in a cell array, to b...

20日 前 | 0

Your question is not perfectly clear to me, but it seems that cellfun might do what you want: A = {1,[2,3;4,5],6}; B = {2,[3,4...

20日 前 | 0

plotting 2 models on one histogram
Here is a hint to get you started. N = 1000; x1 = randn(N,1); x2 = randn(N,1) + 2; figure hold on histogram(x1) histogr...

20日 前 | 0

Is it suitable to include dependent varible when conducting PCA?
I've never used PCA on time series data, and I had never heard of anyone doing so, but googling PCA time series does turn up som...

22日 前 | 0

How to write to in MATLAB, translated from R
String concatenation in MATLAB can be done as "addition": i = 7; "output/" + i + "_script.m"

25日 前 | 0

write superscript in string
It could be the interpreter. Does this work for you? R2 = 0.75; t = sprintf('R^2 = %0.2f',R2); title(t,'interpreter','tex') ...

27日 前 | 0

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How to replace non consecutive value on a vector?
Here is an absolutely terrible, obfuscated way to do this: A = [5,5,5,5,5,4,5,5,5,5,4,4,5,5,5,5,4,4,4,5,5,5,5]; SA = char(A)...

27日 前 | 0

Vector as an input in function
a = 2; b = 3; v = [a; b]; f_out = f(v) function out = f(v) out = 5*v(1) + 7*v(2); end

29日 前 | 2

How do I convert a non-normal distribution to an equivalent normal distribution?
A few thoughts that might be useful, if not exactly a complete answer to your question ... First, I hope it is clear that not a...

I am trying to figure out how to plot my data.
You don't say what kind of figure you want. I suggest you look at the MATLAB Plot Gallery. If you see something like what you wa...

roots(x) vs root= interp1(y,x,0)
It's not clear, at least to me, what you mean by "root = interp1 command". But, my best guess is that if you were somehow trying...

How to present my outcomes in the form of a confusion matrix
If you have the Statistics and Machine Learning Toolbox, you could use the confusionchart or confusionmat command.

Defining upper and lower control limits for a graph
Here is a simple example of setting plot limits based on the data. (The last line of code is where I set the limits.) x = 1:50;...

Create a legend according to the colors of a scatter plot
Unless I have misunderstood your question, you should be able to do this using the gscatter command. The legend will be tied to ...

why cntrd function error
If you are talking about this particle tracking code, you might want to reach out to that team. You might not find very many peo...

split data into 5 train and test data
You can use the cvpartition function to do this, if you have the Statistics and Machine Learning Toolbox. If you don't have tha...

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What is the Len function do? It used to exist in MatLab 4.2, but now it doesn't any insight?
To my knowledge, there has never been a function called len() or Len() in MATLAB. But, I wonder in your case if len() is a user...

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