DeltaIV

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DeltaIV has asked 44 questions and find answers to 5 problems.

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DeltaIV questions

merge some columns in a Polars dataframe and duplicate the others
Tidy up a dataframe where each column contains more than one variable
How to make two arrays contiguous so that Numba can speed up np.dot()
Changing the font size of figure captions in RMarkdown Word output
Compute m columns from 2m columns without a for loop
MATLAB: create a large matrix by repeating elements of a vector, with increasing stride for each column
Ignoring files having different extensions with .gitignore
remove all whitespaces from the headers of a polars dataframe
shell script: with awk, write string1 if string0 is found, else string2
Why can't I get this Runge-Kutta solver to converge as the time step decreases?

DeltaIV answers

merge some columns in a Polars dataframe and duplicate the others
Why can't I get this Runge-Kutta solver to converge as the time step decreases?
Scipy root-finding method
How to turn (interpolate) this irregularly spaced time series into a regularly spaced one in R or Matlab?
interpretation of the output of R function bs() (B-spline basis matrix)