# Pseudoscientist

### Aalto University

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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

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

Question

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

### 3

answersQuestion

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

### 0

answersQuestion

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...

2 years ago | 1 answer | 0

### 1

answerQuestion

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...

2 years ago | 1 answer | 0

### 1

answerQuestion

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...

2 years ago | 1 answer | 0

### 1

answerQuestion

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...

2 years ago | 1 answer | 0

### 1

answerQuestion

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

### 1

answerQuestion

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

### 1

answerQuestion

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

### 1

answerQuestion

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

### 1

answerQuestion

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

### 1

answerCalculate 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...

4 years ago | 0

| accepted

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...

4 years ago | 0

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

Like this

4 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,-...

4 years ago | 3 answers | 0

### 3

answersQuestion

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...

4 years ago | 1 answer | 0

### 1

answerQuestion

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...

4 years ago | 1 answer | 0

### 1

answerQuestion

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. ...

4 years ago | 1 answer | 0

### 1

answerQuestion

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

### 0

answersQuestion

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

answersQuestion

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

answersQuestion

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

### 1

answerQuestion

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