Questions tagged [spectra]
32 questions
4
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1 answer
Savitzky-Golay derivatives, computed with SciPy's signal.savgol_filter need to be scaled?
I'm computing the first and second derivatives of a signal and then plot. I chose the Savitzky-Golay filter as implemented in SciPy (signal module). I'm wondering if the output needs to be scaled - in the Matlab implementation of the same filter, it…
Irina Ciortan
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2
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1 answer
C++ Spectra with RowMajor sparse matrix
I'm trying to use the Spectra 3.5 Library on my Linux machine, and the SparseGenMatProd wrapper for the Matrix-Vector multiplication only seems to work when the sparse matrix is in ColMajor format. Is this normal behavior and if so, how can I fix it…
1
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2 answers
What is the most efficient way to apply operations between arrays of different sizes to each row of a 3D array?
I have a large three dimensional array corresponding to a hyperspectral cube in spatRaster format. I also have two smaller ones (smaller area) that correspond to reference images (dark and white) used to correct values in the pixels of the cube. The…
Mr G
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Is there any faster way to calculate Eigenvalues in C++?
I have to solve for Eigenvalues from Sparse Matrices that are millions*millions at least and can get even bigger!! The problem is that I am getting very slow results even when I solve for 10 smallest eigenvalues from 20000x20000 matrix using the…
Mohammad Ali Yaqteen
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1 answer
How can I fill the space between the x-axis and the curve with the spectral colors?
how can I fill the space between the x-axis and the spectral curve with the corresponding color?
It only shows the colors in a band at the bottom. It would be great if the plot looks like the example:…
Chiara Rüdt
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1
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1 answer
Frequency to RGB
I am looking for a way to convert a dynamic frequency signal to its corresponding color. and I found this script here: