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the cyclist


Last seen: Today
4.511 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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Answered
convert to cell array
You can probably use the datevec function datevec('19:33:02.58')

alrededor de 14 horas ago | 0

Answered
I have calculated Kupec's POF at 95% and 99% confidence levels. Under the 'Test level' column at last, all the values appear as 0.95. Shouldn't the values at 99% confidence level be 0.99? Please help.
The value-at-risk level and the confidence level at which you test that level, are two different things. You can prove that for...

alrededor de 15 horas ago | 0

Answered
How do I create a box in Matlab?
I don't think the box command does what you think it does. Maybe you intended rectangle?

alrededor de 16 horas ago | 0

Answered
How to add each column of matrix A with another matrix B?
I think this does what you want: % Input data A = [1 20; 3 40]; B = [5 6 7; 8 9 10]; % Algorithm: % (1) Permu...

1 día ago | 0

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Answered
Factorial(1000) as number
The largest finite floating-point number in double precision is realmax For reference factorial(170) and factorial(171) Of...

1 día ago | 0

Answered
Array indices must be positive integers or logical values.
Your variable A is the image data. Your variable t is the value of the image data at the (x,y) coordinate. That value of t coul...

3 días ago | 0

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Answered
Inconsistency of angle function in finding angle of vectors
I would not characterize this as an inconsistency, so much as a convention to report the value in the range [-pi,pi], rather tha...

3 días ago | 0

Answered
How to Apply PCA Corrrect way
Your question, especially when you ask about the 88x88 matrix that is output from pca(), indicates that you don't really underst...

3 días ago | 0

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Answered
How can I fit Bessel function of 1st kind with the scatter plot?
I don't have the Curve Fitting Toolbox, so I cannot help with that. However, I used fitnlm, and I see a couple strange things a...

4 días ago | 0

| accepted

Answered
plot (t,y) ,dimension failure
The answer is right there in the error message. Use elementwise multiplication instead of matrix multiplication. clear all; clo...

4 días ago | 1

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Answered
Check true if value in a matrix is increasing,decreasing or staying same
Use the diff command, and check whether the result is greater than zero, etc.

6 días ago | 0

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Answered
Unable to perform assignment because the left and right sides have a different number of elements.
It looks like inside your function, in these lines dS = ((-beta*(B/(B+k))*S(tt) + ub*(S(tt)+I(tt)+R(tt)) - ud*S) * dt)'; dI = ...

6 días ago | 0

Answered
Invalid Expression with plotting t
Your code works after I fix two typos: dt=0.01; h=0.1; w=0.1; to=2.5; t=0:dt:10; r=h*exp(-((t-to).^2)/w^2); plot(t,r,'b',...

6 días ago | 0

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Answered
How to use REGRESSION & INTERPOLATION ?
I don't think you need interpolation for this task. Do you have the Statistics and Machine Learning Toolbox? You could fit a no...

6 días ago | 0

Answered
How to have a x-axis with repeating values (non-unique)
I have not seen a plot of this style. It's a bit confusing to me. I'm curious what the color background regimes are. Training, t...

9 días ago | 0

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Answered
errors using Numerical Integration
I see three errors: (1) You need elementwise division instead of matrix division: y = @(x) 1./(sqrt(1+x.^4)); % note the adde...

11 días ago | 1

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Answered
Uniformly distributed random variables
The main reason your output looks like this is that you are only generating ONE random value for each resistor -- and then recal...

11 días ago | 0

Answered
pseudo code for all n values
Assuming that what you wanted was alternating pattern of 1's and 0's, regardless of how large n is, then this should do what you...

12 días ago | 1

Answered
How to avoid "doubling up" in a RNG?
Here is one way to do what I think you mean: x = zeros(10,10); % For M and N, select 6 random integers from 1:10. M = randp...

12 días ago | 1

Answered
Call matlab from STATA
I haven't run MATLAB from the command line in probably 20 years, but I think I would try putting the whole try-catch structure i...

12 días ago | 0

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Answered
Save a double array to a text file
Regardless of what is displayed to the MATLAB command window (in your case, the default format, it seems), an array of type doub...

13 días ago | 0

Answered
Doubt in a product erro
The reason has to do with the accuracy of floating-point math on a binary computer. I suggest you read this question and answer,...

13 días ago | 1

Answered
How to only show part of a plot
You can set the axis limits of a plot using the xlim (and ylim and zlim) command. If that is not what you meant, I suggest you ...

15 días ago | 0

Answered
using logical functions to display arrays
When x is a vector, then if x < 10 is interpreted as "if all elements of x are less than 10". Your if statement is never enter...

15 días ago | 0

Answered
Cody Problem 14. Find the numeric mean of the prime numbers in a matrix.
After you correct the problem that @Geoff Hayes pointed out in his comment, you still have a mathematical one. out = sum/2 is ...

16 días ago | 0

Answered
Simpsons rule function error
In this line of code: x=x(1)+h*(2*k-1); you have set x to a scalar value, so when you try to access x(2) in this line of code:...

17 días ago | 1

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Answered
What Shall I need to add while calling file having numerical digits (e.g. -1,-2)?
You may want to try the functional form instead. load('Histories/IND.X0kY-1k.CXY.sema'); Also, what variables are in your work...

18 días ago | 0

Answered
clustering based on a custom function
I can't say that I have spent enough time with your code to fully understand it. But, I notice the following. Inside the loop o...

19 días ago | 0

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Answered
data from one array to another
I can't tell what you intend to get from this expression [x(j),:] which is not valid MATLAB syntax. x(j) is the j-th element o...

20 días ago | 0

Answered
How do i get three colums as output?
t = data(:,[93,92,91]); will be the the last three columns from data, in reverse order.

21 días ago | 1

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