Community Profile # Paul Safier

Last seen: Today Active since 2018

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Question

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,...

23 Tage ago | 2 answers | 0

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Question

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...

etwa 2 Monate ago | 1 answer | 0

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Question

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...

etwa 2 Monate ago | 3 answers | 0

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Question

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 ...

3 Monate ago | 2 answers | 0

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Question

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...

5 Monate ago | 2 answers | 0

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Question

After completing some Onramp courses, I wanted to get a copy (to print for hard copy) of the course summary that lists the speci...

11 Monate ago | 1 answer | 0

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Question

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...

etwa ein Jahr ago | 0 answers | 0

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Question

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...

etwa ein Jahr ago | 1 answer | 0

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Question

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...

etwa ein Jahr ago | 1 answer | 0

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Question

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...

etwa ein Jahr ago | 2 answers | 0

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Question

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...

mehr als ein Jahr ago | 0 answers | 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...

mehr als ein Jahr ago | 0

Question

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, ...

mehr als ein Jahr ago | 1 answer | 0

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Question

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...

mehr als ein Jahr ago | 1 answer | 0

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Question

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 ...

fast 2 Jahre ago | 4 answers | 0

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Question

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...

etwa 2 Jahre ago | 2 answers | 0

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Question

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...

mehr als 2 Jahre ago | 0 answers | 0

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Question

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 ...

mehr als 2 Jahre ago | 0 answers | 0

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Question

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...

mehr als 2 Jahre ago | 0 answers | 0

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Question

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...

mehr als 2 Jahre ago | 0 answers | 0

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Question

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...

mehr als 2 Jahre ago | 0 answers | 0

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Question

Segment Dumbbell Structure into Two Circles and One Rectangle
I'm trying to analyze three shapes from this image--two circles and one rectangle. I would like each to be a separate object det...

fast 3 Jahre ago | 1 answer | 0