Community Profile # the cyclist

### Alden Scientific

Last seen: 1 día 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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Datetime won't recognise some cells
Two minor but important changes to your syntax: datetime(data.TimeofDay,'InputFormat','HH:mm:ss.SSS') Note that I used 'Input...

1 día ago | 2

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...

4 días ago | 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...

4 días ago | 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...

5 días ago | 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...

8 días ago | 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...

9 días ago | 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 ...

10 días ago | 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...

11 días ago | 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;...

14 días ago | 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 ...

16 días ago | 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...

19 días ago | 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...

21 días ago | 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 ...

21 días ago | 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...

21 días ago | 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...

22 días ago | 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...

22 días ago | 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...

22 días ago | 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...

25 días ago | 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"

27 días ago | 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') ...

29 días ago | 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)...

30 días ago | 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

alrededor de 1 mes ago | 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...

alrededor de 1 mes ago | 2

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...

alrededor de 1 mes ago | 0

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...

alrededor de 1 mes ago | 0

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.

alrededor de 1 mes ago | 0

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;...

alrededor de 1 mes ago | 0

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 ...

alrededor de 1 mes ago | 1