I have a triangulated mesh that I generated with the Delaunay 3D function in PyVista. I would like to calculate the surface area of the mesh adding up the areas of all the triangles. Is there a way to obtain the indices of the simplices triangles from the delaunay result? I know I can do it with Scipy but for
Tag: scipy
Why can’t I install a Python package with the Python requirement “>=3.8,<3.11" into a Poetry project with the Python version "^3.9"?
I’m having an issue installing dependencies into my Poetry project. If I run poetry new (as described in https://python-poetry.org/docs/basic-usage/), I can create a new project: My project structure looks like this after I delete a few files not needed for this reproduction: My pyproject.toml file look…
scipy.signal.find_peaks return empty properties
I tried to obtain properties from scipy.signal.find_peaks, but it returns an empty dictionary {}. Can anyone help to fix it? Answer The problem is that you are passing None to prominence. None is already the default value, and is used to signal that no value for the argument was given. Pass a numeric value as…
Scipy Optimise (minimize) not giving correct results
I am trying to do a simple minimisation as below using SciPy optimise, but the expected results are NOT matching the optimiser output: I would expect the final results to be close to “x_expected”… but that is not the case.. any ideas ? Answer SLSQP solver failed to find the optimal value for…
Scipy BasinHopping not returning correct global minima
I’m working with the following scipy code. The global minimum of this function is at 0, but this isn’t what basin hopping returns. Depending on the start position x0, it returns different local minima – not the global one at 0. If we set x_0 = -6, it returns a minima at -7.7, if we set x0 = …
How to fit a power law to the dataframe and plot it?
I have two columns(rcs,range) in a dataframe. rcs range -40 12.9 -35 14.9 -30 22.9 -25 35.44 -20 43.48 -15 62.4 -10 92.4 -5 132.99 0 182.6 5 252.99 I want to plot a curve with equation rcs = range^4 I tried the following 1.as a polynomial curve fitting in the above plot,the curve is not a smooth curve and
Is there a function in sympy or scipy that corresponds to massMatrixForm in matlab?
I am learning rigid body kinematics from: https://rotations.berkeley.edu/the-poisson-top-with-friction/ . The link to the matlab source code is at the bottom of the page. Derive the Poisson top’s equations of motion: http://rotations.berkeley.edu/wp-content/uploads/2017/10/derive_poisson_top_ODEs.txt Solve th…
Define correct scipy.signal.spectrogram input parameters
I have the following code: which is giving me the following plot: What is the correct way to define the correct parameters, namely: nperseg, nfft and noverlap to obtain a correct and smooth plot? Thank you! Plot of the input signal: Answer I was able to solve this issue by normalising the input signal and doi…
NumPy array row differences
I have a NumPy array vectors = np.random.randn(rows, cols). I want to find differences between its rows according to some other array diffs which is sparse and “2-hot”: containing a 1 in its column corresponding to the first row of vectors and a -1 corresponding to the second row. Perhaps an examp…
how to calculate correlation coefficient for a scatter-plot in scipy
i am trying to calculate the correlation coefficient for a scatterplot with scipy, the thing is, i have a kind of complex dataset in an ndarray, and the basic syntax does not work for me… here is my full code: Answer pearsonr works fine on your data You were passing two floats (namely values at the row …