The mathematical problem is:The expression within the sums is actually much more complex than the one above, but this is for a minimal working example to not over-complicate things. I have written this in Python using 6 nested for loops and as expected it performs very badly (the true form...

## Speeding up loop when normalizing Pandas data

I have a pandas dataframe:This data is actually "sequential" and I would like to transform it to this structure:

## Best way to flatten dataframe based on values on column

I have to process a whole dataframe with some hundered thousands rows, but I can simplify it as below:

## Why does “vectorizing” this simple R loop give a different result?

Perhaps a very dumb question.I am trying to "vectorize" the following loop:I think it is simply x[sig] but the result does not match.

## Why does “vectorizing” this simple R loop give a wrong result?

## Why does “vectorizing” this simple R loop give the wrong result?

## Why “vectorizing” this simple R loop gives wrong result?

## How can I express this large number of computations without for loops?

I work primarily in MATLAB but I think the answer should not be too hard to carry over from one language to another.

## Does the term “vectorization” mean different things in different contexts?

Based on what I've read before, vectorization is a form of parallelization known as SIMD. It allows processors to execute the same instruction (such as addition) on an array simultaneously.

## Using “curve” to plot a function: a tricky expression?

My question concerns something that should be fairly simple, but I can't make it work. What I mean is you can calculate x and y and then plot them with the plot function. But can this be done using the curve function?