Paul Safier

Last seen: 6 días hace | Con actividad desde 2018

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Stacked Cuboid for PDE Domain
Can the following domain be created for use in the PDE Toolbox? It does not seem that ordinary operations with the multicuboid f...

2 meses hace | 3 respuestas | 0

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What formula for r-squared does fitlm use in the weighted linear regression case?
If I use fitlm as: mdl = fitlm(X,Y,'Weights',W); can someone tell me the formula used in computing the r-squared that's here: ...

2 meses hace | 1 respuesta | 0

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How to implement weighted Linear Regression
@John D'Errico do you know how to compute the R^2 value in this weighted case?

2 meses hace | 0

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Extrude 2D Domain into 3D
I am having trouble extruding a 2D domain into a 3D domain for use in the PDE Toolbox. Perhaps I cannot use decsg to create the ...

4 meses hace | 1 respuesta | 0

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pdeplot with same colorbar range
I am trying to plot the results of solving the transient heat equation. I want to use pdeplot to show the temperature distributi...

5 meses hace | 1 respuesta | 0

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Trouble concatenating a cell.
I want to concatenate the cell in the image such that rows 1,2 and10 are expanded, i.e. rows 1 and 2 each become 4 rows. Row 10 ...

7 meses hace | 1 respuesta | 0

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Code Fails to Write to Folder that has Correct Write Permissions
This question is a follow-up to the one answered by @Walter Roberson here: https://www.mathworks.com/matlabcentral/answers/2001...

9 meses hace | 2 respuestas | 0

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MATLAB won't run a code even when in directory containing the code
I try to run a code initially from my home directory. Matlab states that the code exists in a specific folder and I should navig...

9 meses hace | 1 respuesta | 1

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What is the output when Particle Swarm Optimization exceeds MaxTime
I ran the following PSO code and the MaxTime was exceeded. The code spit out a result, but I don't know: Is it the best soluti...

más de 1 año hace | 1 respuesta | 0

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Problems clustering with kmeans
I have a data set that is x,y,v. Each vector is quite long, ~2 million rows. Also, the data is scattered, i.e. not at regular x,...

más de 1 año hace | 2 respuestas | 0

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Can one of MATLAB's optimization algorithms (e.g. particle swarm optimization) take the place of this brute force parameter sweep iteration?
I want to find an optimal set of parameters but the time to run through every combination (in a brute force parameter sweep) wil...

más de 1 año hace | 1 respuesta | 0

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Each PARFOR Worker Writes to the Same File
I understand that having each worker write to a single file is a no-no. Perhaps as expected, when I run this code, it shows so...

más de 1 año hace | 4 respuestas | 0

4

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PARFOR is 10X Slower than FOR
I'm trying to understand why my use of the parfor is so much slower than using a for loop. Both parfor and for implementations ...

casi 2 años hace | 2 respuestas | 0

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Error using Table with New Installation of 2022a
When I run these simple commands, I get the following error. I'm not sure where to look to address this. xmin=1; xmax=2; ymin...

casi 2 años hace | 2 respuestas | 0

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Course Summaries Document Available to Download/Print?
After completing some Onramp courses, I wanted to get a copy (to print for hard copy) of the course summary that lists the speci...

más de 2 años hace | 1 respuesta | 0

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Advice on Speeding up Loops
I need to run the code below with the parameter amnt equal to about 10^8. The loops are very expensive and I have written in a w...

más de 2 años hace | 0 respuestas | 0

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Convert a matrix of doubles to an RGB image, and then back to a matrix of doubles (ideally matching the original)?
Can someone offer any advice on how one could take a matrix of doubles, convert it to an RGB image, and then BACK to the origina...

más de 2 años hace | 1 respuesta | 0

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Techniques for blending images that have overlap
I have some images that all overlap each other by a known amount (e.g. 15% of the pixels on along a side). No registration shoul...

más de 2 años hace | 1 respuesta | 0

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How to get matrix indices from roipoly
I have a matrix that I want to extract an ROI from. I am using roipoly to clip the region. The syntax below gives the coordinate...

más de 2 años hace | 2 respuestas | 0

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Gaussian filter with fspecial versus imgaussfilt
I have two questions. First, I want to filter a function with a Gaussian that has a standard deviation with dimensions of length...

casi 3 años hace | 0 respuestas | 0

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convolution with gaussian kernel using fft
@David Goodmanson: Can you point me to where you found the 3.53 value? All this discussion has led me to conclude that sin...

alrededor de 3 años hace | 0

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Extract Gridded Data from Isosurface
I want to get the x, y and z data of a surface that I extract from a volume via isosurface. I am doing it in the following way, ...

alrededor de 3 años hace | 1 respuesta | 0

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Parfor Loop Error with Classification
When trying to convert the outer loop of the code below to a parfor loop, the error is: Error: The variable z_new in a parfor...

alrededor de 3 años hace | 1 respuesta | 0

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Solve as Optimization Problem in Matlab
I want to solve this simple equation as an optimization problem in Matlab. I have tried linprog, fmincon and fminunc and all do ...

más de 3 años hace | 4 respuestas | 0

4

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Change folder that Matlab saves session information
I run Matlab on Linux machines. Matlab is saving session information (e.g. History.xml, parallel_settings, etc) in a folder cal...

más de 3 años hace | 2 respuestas | 0

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Remove Internal Faces from Geometry
Is it possible to remove the internal faces of this geometry: pdem = createpde; g = multicuboid(40,40,0.1*ones(10,1),'Zoffse...

casi 4 años hace | 0 respuestas | 0

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Coefficient Multiplying Laplacian Implicit in Neumann BC?
I'm solving the parabolic equation: I set up the PDE as: specifyCoefficients(model,'m',0,'d',1,'c',D,'a',0,'f',0); and ...

alrededor de 4 años hace | 0 respuestas | 0

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Mesh the Inside of a 3D Patch
I am trying to solve a PDE via the PDE Toolbox and am having trouble building the mesh/geometry. I have built the volume via the...

alrededor de 4 años hace | 0 respuestas | 0

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Create 3D Geometry for PDE Toolbox
I am having trouble creating the geometry of the attached image for use in the PDE toolbox. I have tried several things: i) rewo...

alrededor de 4 años hace | 0 respuestas | 0

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Hmax in GenerateMesh to be Different for x, y and z Directions?
I'm using the PDE Toolbox to solve a 3D elliptic problem in cartesian coordinates. The domain has an aspect ratio of about 40 an...

alrededor de 4 años hace | 0 respuestas | 0

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Paul Safier

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