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Computational Science : Recent Questions and Answers (Page 17)

Find answers to your questions about Computational Science or help others by answering their Computational Science questions.

Algorithm to convert STL files to STEP files

My goal is to learn the algorithms that allow to convert STL files to step files. I am struggling to find learning materials. Can you suggest here research papers, books,...

Asked on 06/28/2021 by blunova

0 answer

How does the number of function calls in BFGS scale with the dimensionality of space

Is there any estimate for the scaling of the number of function calls in BFGS-optimization with the dimensionality of the search space? Specifically I am assuming a (free) expression for...

Asked on 06/27/2021

1 answer

Integral over a surface, given experimental data

I have a mesh of a 3D surface composed by triangles, and I have the value of a function $u(x,y,z)$ in every vertex of the mesh (every vertex of...

Asked on 06/27/2021

1 answer

Developing a meshfree contouring algorithm

I would like to find the contours of a scalar function $u(x,y)$ available as a discrete set of function values $u_i = u(x_i,y_i)$ over a scattered set of...

Asked on 06/27/2021

1 answer

How to take convolution of two arrays in Python by using NumPy?

Generally, we know that if we have this relation between Fourier transforms of three functions in frequency domain as: $$mathfrak{F}{mathsf{P}(t)} = mathfrak{F}{mathsf{Z}(t)}mathfrak{F}{mathsf{Q}(t)}$$ We should have this relationship in the...

Asked on 06/27/2021

0 answer

Asymptotic complexity of fixed-rank SVD

According to the Wikipedia article on Singular Value Decomposition, the asymptotic complexity of computing the SVD of an arbitrary m×n matrix M with m>n by the popular...

Asked on 06/25/2021

1 answer

Renumbering the nodes for quadratic basis functions for a 2D domain

I have a simple triangulation for a 2D domain, described by the connectivity matrix $T$ and by the point matrix $P$. For didactic purposes, I assembled the stiffness...

Asked on 06/25/2021

1 answer

How to convert this code to scan random datas instead of binned datas?

I am new to Fortran and I am trying to write a code using random data instead of binned data in x, y, z as shown in my sample code....

Asked on 06/24/2021 by Dark Knight45

0 answer

Choosing good modelling method for solving Boltzmann equation

I'm writing a solver for Boltzmann Equations (BE) including a force term in rarefied plasma, for my PhD. The aim is to see if an instability occurs inside an electric...

Asked on 06/21/2021 by Paweł J

0 answer

Specifying mesh spacing for DFT in numpy

I was testing the .fft package of numpy 1.16.1 in Python 3.7.2. In particular I was trying to verify that the transform resembles the analytical one for:...

Asked on 06/21/2021 by user30058

1 answer

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