James Akula
Harvard Medical School
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Alphashape boundary detection not working as desired
An answer that seems to work is to convert the alphashape into a triangulation and then use "boundaryshape." load XY.mat s...
10 Monate vor | 0
| akzeptiert
Frage
Alphashape boundary detection not working as desired
Given a complex set of (x, y) data I would like to create a hull that is not convex but not fully conforming. I (think I) prefe...
10 Monate vor | 3 Antworten | 0
3
AntwortenFrage
min and max Functions Breaking After Conversion From Symbolic to MATLAB Function
If I have a function whose values I want to constrain between some minimum and maximum values, I can use the min and max command...
11 Monate vor | 1 Antwort | 1
1
AntwortFrage
How best to change the colors of pixels in an image with known X (column) Y (row) coordinates?
The obvious way is to loop over every XY pair and change the color of the identified pixel, but this is very slow. I can do a l...
etwa ein Jahr vor | 1 Antwort | 0
1
AntwortFrage
matlabFunction: Why the extra ".0" and why only sometimes?
f = @(x)2.^x.*x.^2 f = sym(f) f = matlabFunction(f) While functionally irrelevant, it makes formulae difficult to read. Wh...
etwa ein Jahr vor | 1 Antwort | 0
1
AntwortComparing two curve fits (using AIC?)
I belive the following functions perform the AIC test, as shown in https://www.mathworks.com/matlabcentral/answers/1893055-compa...
mehr als ein Jahr vor | 0
| akzeptiert
Frage
Comparing two curve fits (using AIC?)
Hello all, Let's say for a moment I have some a priori ideas about a family of functions that might best describe a particula...
mehr als ein Jahr vor | 2 Antworten | 0
2
AntwortenFrage
Can the efficienty of this code be improved, either computationally or just in terms of lines of code?
Dumb question for a smart person who has a moment to kill. Let's say I have data that will come in from n groups, and I know a ...
mehr als ein Jahr vor | 2 Antworten | 0
2
AntwortenGesendet
Fit Circle to Weighted (x,y,w) Data
This program fits a circle to weighted set of 2D data.
fast 2 Jahre vor | 2 Downloads |
Pairwise post-hoc testing using coefTest
I do believe I answered the question. Adding the following code to the problem seems to give me the answer I want. Uncommentin...
fast 2 Jahre vor | 0
| akzeptiert
Frage
Pairwise post-hoc testing using coefTest
Hello, I found this post from back in 2015 but it doesn't seem to answer the question (and if it does, I am sorry that I am mis...
fast 2 Jahre vor | 1 Antwort | 0
1
AntwortFrage
MATLAB function and symbolic function give different answers
% Some values for the plot A = 0.5 B = 2 % MATLAB and symbolic functions generated two ways f = @(a, b, x) (a .* (x - b).^...
etwa 2 Jahre vor | 1 Antwort | 0
1
AntwortFrage
How to determine if points fall above an arbitrary line?
Hello all, I am trying to find a way to determine if points are above or below an arbitrary line. For example, the code numXY...
fast 4 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Fit a conic section without mirror image hyperbola
I would like to fit conic sections to my data using something like the general form a.*x.^2+b.*x.*y+c.*y.^2+d.*x+e.*y+f. I have...
mehr als 4 Jahre vor | 2 Antworten | 1
2
AntwortenFrage
Determining units for a variable
Hi all, I think I know the answer for the specific problem below, but I wonder if there is a more general process that could...
mehr als 5 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Looking to duplicate SPSS MIXED in MATLAB
I have a repeated measures data-set with some missing data. Subjects from three different groups were randomly assigned to eith...
mehr als 5 Jahre vor | 0 Antworten | 0
0
AntwortenFrage
Finding points of zero slope from 3D function
I will be fitting 3D differences of Gaussians to data, and from these fits I want to be able to identify troughs and peaks (poin...
mehr als 6 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Solve cannot find solutions where plotting shows they exist
I am trying to find points in a function, after fitting to some data, where the slope is zero. The obvious (to me) way to do th...
fast 8 Jahre vor | 1 Antwort | 0
1
AntwortFrage
Converting from Zernike's Polynomials values to a Point Spread and Modulation Transfer Function
Dear all, I have a dataset obtained from a wavefront sensor that provides me with the values of the first 36 Zernike's Polyno...
mehr als 8 Jahre vor | 1 Antwort | 0