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Pseudoscientist


Aalto University

Last seen: 8 months ago |  Active since 2019

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Answered
3D logaritmic spirals on surface
I have made some progress: function plot_spiral_on_surface() % Curve y = 1/x curve_func = @(x) 1./x; x_min = 1...

1 year ago | 0

Answered
3D logaritmic spirals on surface
Do you mean like this? I dont quite understand, for example [x, y, z] = logarithmic_spiral_3d() are unused function plot_rotate...

1 year ago | 0

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3D logaritmic spirals on surface
I'm attempting to plot twelve equally spaced 3D logaritmic spirals that start from the circumfrence of my surface and then conve...

1 year ago | 3 answers | 0

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Calculating the trajectories of several helixes running along the surface of the same cylinder
I'm attempting to write script that plots the trajectories of several helixes that run along the surface of a cylinder I want t...

1 year ago | 0 answers | 0

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Fill empty cylinders in binary volume
Hello I'm trying to fill empty cylinders in a binary 3d volume.: load cylinders.mat J = bwmorph3(OutputBinaryImage2,'fill...

1 year ago | 1 answer | 0

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Magnetic forces and torques of a system of magnets in when B fields are known
Hello, I'm attempting to calculate the forces and torques experiences by a system of magnets in a magnetic field set up by anoth...

1 year ago | 1 answer | 0

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Rotating a point cloud fails
Hello, I'm attempting a rotate a point cloud that is defined in the attachment 'point_cloud.mat'. The points are 32 points equi...

1 year ago | 1 answer | 0

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Numerical answer to Partial derivative of Hopfield-style Energy in symbolic expression
Hello, I'm implementing a gradient descent optimizer that uses Hopfield-style energy as function, the hopfield-style energy i...

1 year ago | 1 answer | 0

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Eigenvectors of a 3D eigenvalue matrices
I have three matrices called Lambda1, Lambda2 and Lambda3. The size of each matrix is 512x512x220. Lambda1 contains eigenvalues ...

2 years ago | 1 answer | 0

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Need help designing stopband filter
Hello, I'm trying to design a stopband filter that can remove spikes at 1.294 Hz and 3.101 Hz My data matrix 64x64x64x2960, w...

2 years ago | 1 answer | 0

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Bandstop filtering fMRI data did not work
I have a 64*64*64*2960 matrix of fmri data, where 64*64*64 are the spatial dimensions of the data and 2960 is the temporal dimen...

2 years ago | 1 answer | 0

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Stopband filter with multiple stopbands
Hello, I have a fMRI signal sampled at 10 Hz and I need to create a stopband filter with three stop bands This examle looks ...

3 years ago | 1 answer | 0

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Stem plot so that markers are not in the axis
How can I edit this plot so that the markers highlighted by red rectangles are not in the axis`? intrinsic_noise_xy_mat =...

3 years ago | 1 answer | 0

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Answered
Calculate 2 opposing fibonacci spirals from every point of a circle circumfrence
clear all theta = 0:pi/36:2*pi; phi = 0.5*(1+sqrt(5)); r = phi.^(2*theta/pi); r_1=phi.^(2*(-theta)/pi); testi = exp(1i*thet...

3 years ago | 0

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Answered
Calculate 2 opposing fibonacci spirals from every point of a circle circumfrence
theta = 0:pi/30:2*pi; phi = 0.5*(1+sqrt(5)); r = phi.^(2*theta/pi); x = r.*cos(theta); y = r.*sin(theta); figure(1);hold on...

3 years ago | 0

Answered
Calculate 2 opposing fibonacci spirals from every point of a circle circumfrence
Like this

3 years ago | 0

Question


Calculate 2 opposing fibonacci spirals from every point of a circle circumfrence
phi = 0.5*(1+sqrt(5)); % golden ratio r = phi.^(2*theta/pi); % fibonacci spiral polarplot(-theta,r,theta,r,theta,-r,-theta,-...

3 years ago | 3 answers | 0

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Temporary variable must be set inside parfor before it is used
I'm my code I get this error "Temporary variable must be set inside parfor before it is used" I don't understand why it is no...

3 years ago | 1 answer | 0

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I need help with parpool and optimizing recources for image reconstruction, running matlab with batch script
Im running an image reconstruction (1798 head volumes) script on a computation cluster These are my recources Nodes: 1 Mem pe...

3 years ago | 1 answer | 0

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Why is the same variable displayed colored and uncolored?
The struct D is displayed with green color until it suddenly (row 562) loses its green color and things go wrong after that. ...

3 years ago | 1 answer | 0

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Re-arrange matrix row elements so that a specific condition is fulfilled
Say we have matrix A = 1 2 3 1 3 5 1 2 4 2 3 7 The task is the re-arrange the row elements so that in no row 2 elements...

5 years ago | 0 answers | 0

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For every matrix row find rows within the same matrix that have more than one common element in same index below the row
Let's say I have matrix A, every row contains three values and for every row of the matrix A need to find other rows that have m...

5 years ago | 2 answers | 0

2

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Shuffle matrix rows so that common elements are in completely different order than in a said row
Say we have a matrix row 'current_row' 1 2 3 and a matrix A 1 2 5 1 3 6 2 4 3 The task is to re-arrange matrix A so that...

5 years ago | 2 answers | 1

2

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Find rows in matrix A that contain value x, find() fails
I have a 472944 x 5 matrix and I need to locate rows have at least a single occurence of value x=0 in their four first (1:4) ele...

5 years ago | 1 answer | 0

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Find matrix rows that have 3 common values, store the rows and the values
Suppose I have a 500000x5 matrix and for each row I need to find rows that have 3 common elements within the first 4 elements of...

5 years ago | 1 answer | 1

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