DeltaIV

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DeltaIV has asked 36 questions and find answers to 4 problems.

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DeltaIV questions

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?
Fast way to compute only the diagonal of the square of a matrix
Find second occurence from the right of a character, without iteration
replace a Polars column with a 1D array
Add a new column into an existing Polars dataframe
Extract a substring from a string, as well as the remainder of the string
Get a random subset of a dictionary
Multiply each column of a data frame by the corresponding value of a vector [duplicate]
Build a file diagram for an R code

DeltaIV answers

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)