Only 0's may be mixed with negative subscripts


Could you create a reprex of this example?
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My guess is that indeed you are trying to subset data structure in two opposing ways. You can either use 'inclusion' like myList[1:3] will select all indices 1 - 3, or 'exclusion' like myList[-c(1:3)] will select everything but index 1 - 3. You can't however combine the two.