the cyclist
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4.518 total contributions since 2011Data 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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Why doesn't this matlab code work?!
You missed a spot where you needed an element-wise operation, multiplying the exp(x) by the other term: x = -5:1:5; y = exp(x)...
ongeveer 8 uur ago | 0
Reducing memory of variables
Yes, there are many numeric types that use less memory than a double. Looks like you could use an 8-bit unsigned integer.
ongeveer 17 uur ago | 0
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vector with spacing (predefined)
Does v = -25:5:15 do what you want? Or maybe you meant initial_value = -25; step_size = 5; final_value = 15; v = initial...
1 dag ago | 0
Can someone please help me stop "Index exceeds array bounds." in iteration? Any help is highly appreciated.
In your for loop, when n==5, your code tries to execute x1(n-1) which is x1(4) But your vector x1 is length 3, so there is n...
1 dag ago | 0
How to remove space between bars in bar graph for unequally spaced data?
To me, it seems like a bad idea to make the bars evenly spaced, if the data are not from evenly spaced years. If the x-axis repr...
2 dagen ago | 0
M-point averaging filter
You should be able to use the movmean function. For example: % Define some data A = reshape(1:15,3,5); % Take the moving av...
3 dagen ago | 0
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How to get a license?
The starting point for acquiring a campus-wide license is here. To find MATLAB options for yourself, click on the Get MATLAB bu...
3 dagen ago | 1
convert to cell array
You can probably use the datevec function datevec('19:33:02.58')
5 dagen ago | 0
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...
5 dagen ago | 0
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?
5 dagen ago | 0
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...
5 dagen ago | 0
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Factorial(1000) as number
The largest finite floating-point number in double precision is realmax For reference factorial(170) and factorial(171) Of...
5 dagen ago | 0
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...
7 dagen ago | 0
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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...
7 dagen ago | 0
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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...
7 dagen ago | 0
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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...
8 dagen ago | 0
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plot (t,y) ,dimension failure
The answer is right there in the error message. Use elementwise multiplication instead of matrix multiplication. clear all; clo...
8 dagen ago | 1
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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.
10 dagen ago | 0
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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 = ...
10 dagen ago | 0
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',...
10 dagen ago | 0
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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...
10 dagen ago | 0
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...
13 dagen ago | 0
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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...
15 dagen ago | 1
| accepted
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...
15 dagen ago | 0
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...
16 dagen ago | 1
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...
16 dagen ago | 1
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...
16 dagen ago | 0
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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...
17 dagen ago | 0
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,...
17 dagen ago | 1
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 ...
19 dagen ago | 0
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