Readers,
For a matrix:
1 10 20 30
2 15 40 60
3 20 80 120
Using a spreadsheet, a differential function can be applied to the data
as a formula:
|(10-15)/(1-2)| ... repeated for each pair of adjacent values
What is the corresponding function in R please?
Is it better to write a new function, or to use some form of function
'diff'?
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