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State space model back-propagation gradient descent
I have a state space model Xk+1 = A xk + B and yk = C Xk + D. I want to start the matrices randomly and adjust them using gradie...

7 jours il y a | 1 réponse | 0

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Unique RGB colors for segmentation
Hi , I have an image. This image was generated by a segmentation artifact. Each geometric region has a color. I need to use th...

7 mois il y a | 1 réponse | 0

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gradient descent for custom function
I have four equations: 1) e = m - y 2) y = W_3 * h 3) h = z + W_2 * z + f 4) f = W_1 * x I want to update W_1, W_2 and W...

7 mois il y a | 1 réponse | 0

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Plot sequence of images on top of a trajectory
I have a a 3D array G that has frames of a ball moving. I also have a variable named traj, that gives me the coordinates of the ...

8 mois il y a | 1 réponse | 0

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Find frequency of words from different books
I have a cell array of data collected from 5 different books This is one of the cell arrays. It gives me the count of each w...

8 mois il y a | 1 réponse | 0

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Transform coordinates into pixel
Hi .. I am generating an animation of two eliptical trajectories. The animation have 100 timesteps and for each timestep, I po...

9 mois il y a | 1 réponse | 0

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remove DC component of real time signal
I am using a interface for acquiring a signla in matlab. The signal is sampled at 500Hz. I have to remove the DC component in r...

environ un an il y a | 1 réponse | 0

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Zero detection in online signal
Hi.. I am acquiring a signal from an EEG from a matlab script. I know approximatly the frequency of the signal (0.5Hz to 4 Hz)....

environ un an il y a | 1 réponse | 0

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detect troughs (minimum) of a signal to fire an action. (the signal is being acquired online)
Hi.. I am acquiring a signal from an EEG. I know approximatly the frequency of the signal. I need to play a sound when the sig...

environ un an il y a | 1 réponse | 0

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sound normalization made distortion bigger
Hi.. I normalized some wav files using the following code. The reason to normalize is that I need the sound to have the same pow...

environ un an il y a | 1 réponse | 0

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Adjacency matrix with periodic boundaries
I have a 2-dimensional square lattice of nodes . I need to find the distance between the nodes (adjacency matrix), but I should...

environ un an il y a | 1 réponse | 0

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What stat test to use for improved task?
I have an experiment where a group of subjects have to learn to associate some sounds to images (day, sound 1-image 1, sound2 -i...

environ un an il y a | 1 réponse | 0

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Pink noise with specific power P
I need to generate pink noise signal with a specific power P. I can't figure it out on how to do that using the built-in functio...

plus d'un an il y a | 1 réponse | 0

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Generate pinknoise with same power as audio
I need to read an audio file and generate a pinknoise with the same power. I tought using generatepinknoise(), but the built...

plus d'un an il y a | 1 réponse | 0

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Nonlinear Regression using a gaussian in a lattice
I have a system of equations where the relationship between input and output is derived from a pixel lattice: where and s...

plus d'un an il y a | 1 réponse | 0

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shuffling phases of fft when length is odd
I need to make an audio signal unrecognizable but maintain its rms value. I tought about randomizing the phases. However, my co...

plus d'un an il y a | 1 réponse | 0

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Question

Matrix power vs for loop
Hi. I have to iterate a linear system of the type x(k+1) = Ax(k), with x being a vector of 1024 elements. I only care about th...

plus d'un an il y a | 2 réponses | 0

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Least Squares with constraint on absolute value
Hi , I need to solve a least squares values of the form , where x is a 32x1 vector and B is a 32x32 matrix. Howerver, x is co...

plus d'un an il y a | 2 réponses | 0

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Euller method to solve mackey glass system
In my understanding , dt needs to be very small so that the Euller method works. I am solving the mackey glass equation dx(t...

plus d'un an il y a | 1 réponse | 0

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