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supernoob


Last seen: 3 years ago |  Active since 2018

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All nonlinear fitting options ignore the magnitude of the weights when computing the uncertainty on the fit coefficients
I've tried using fitnlm(), fit() and nlinfit() to fit a non-linear model to my experimental data. The data points each have a re...

4 years ago | 1 answer | 0

1

answer

Question


coefficient standard errors from 'fit' function
How can I compute the coefficient standard errors for coefficients returned using the 'fit' function? I see that I have access o...

4 years ago | 1 answer | 0

1

answer

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How to make errorbar transparent?
How can I make a plot with discrete errorbar points which are transparent? This thread did not contain an answer: https://www.m...

5 years ago | 1 answer | 0

1

answer

Question


Trouble evaluating integral where function is made of huge and tiny values
Hi there, I'm trying to integrate a function which is the product of one tiny and one large value. Analytically, this makes the...

5 years ago | 0 answers | 0

0

answers

Question


need help vectorizing a complicated loop
Hi, I need to evaluate a vector of a function on a mesh then sum that vector at each point on the mesh. Let me elaborate: I ha...

6 years ago | 1 answer | 0

1

answer

Answered
using dir() to get timestamp of file with ms precision
As Walter Roberson mentioned, this is impossible with dir(). One could use Jan's solution though that was not appropriate in thi...

6 years ago | 0

| accepted

Question


using dir() to get timestamp of file with ms precision
Hi there, I am looking to extract the timestamp (specifically, the "modification date") of some files in a folder. If I use d...

6 years ago | 2 answers | 0

2

answers

Question


Solving for level curves of an elliptic paraboloid given by quadric surface equation
Hi there, I have an equation which describes an elliptic paraboloid: Ax^2+Bxy+Cy^2+Dx+Ey+F = Z (Note, the coefficients A,B,...

6 years ago | 1 answer | 0

1

answer

Answered
Integrating to get volume under bivariate normal distribution
The mistake is squaring the variance in the denominator of the exponential terms. The variance is already squared. The correct e...

6 years ago | 0

| accepted

Question


Integrating to get volume under bivariate normal distribution
Hi there, I have 2 gaussian random variables which together form a bivariate normal distribution. Let's call them A and B. Say ...

6 years ago | 1 answer | 0

1

answer

Answered
Integrate velocity field over a (cylindrical coordinate) disk
Hi there, I think intergal2 in polar coordinates should do the trick. https://www.mathworks.com/help/matlab/ref/integral2.html ...

6 years ago | 0

Question


Integrating bivariate normal distribution in polar coordinates efficiently
Hi there, I have a bivariate normal distribution which I would like to integrate over a specified area in polar coordinates. ...

6 years ago | 1 answer | 0

1

answer

Question


How to fit multivariate pdf and cdf from data
I have a set of simulated data from a Monte Carlo simulation which gives me a bivariate distribution. I can plot the results usi...

6 years ago | 2 answers | 0

2

answers

Question


Casting cell array of cells to something workable
Hi there, I have an Nx1 cell (named 'intervals') which contains cell arrays. For example: K>> intervals(1:5,1) ans ...

6 years ago | 1 answer | 0

1

answer

Question


Generate clusters of points which are periodically spaced
Hi there, I'd like to find an efficient way of generating clusters of points where each cluster is periodically spaced. So for ...

6 years ago | 1 answer | 0

1

answer

Answered
Histogram and Gaussian curve showing Mean and 1-sigma
Hi there, it looks like you are plotting on two separate figures. Try starting with something like: figure(100); hold on ---r...

6 years ago | 0

Question


Computing average absolute time from date strings without years
Hi there, I have a very large table with a column of (12 hr) times saved as strings in a cell array, and a column of folder nam...

6 years ago | 3 answers | 0

3

answers

Answered
Computing average absolute time from date strings without years
Ok, I've got it all working, though it isn't quite as compact as I hoped. Here is how it goes: for i=1:numel(exa...

6 years ago | 0

Answered
Computing average times from an array of datetime using only selected rows
I figured it out: simply convert to datenum and then back: average_time = accumarray(subs, datenum(exact_times), [], @mean)...

6 years ago | 0

| accepted

Question


Computing average times from an array of datetime using only selected rows
Hi there, I have an array of datetime variables, and an array with a number in each row which corresponds to how I want to 'gro...

6 years ago | 1 answer | 0

1

answer