On 8/23/20 5:02 PM, Rory Winston wrote:
Hi
I noticed a small inconsistency when using sum() vs cumsum()
I have a char-based series
> tryjpy$long
[1] "0.0022" "-0.0002" "-0.0149" "-0.0023" "-0.0342" "-0.0245" "-0.0022"
[8] "0.0003" "-0.0001" "-0.0004" "-0.0036" "-0.001" "-0.0011" "-0.0012"
[15] "-0.0006" "0.0016" "0.0006"
When I run sum() vs cumsum() , sum fails but cumsum converts the
series to numeric before summing:
sum(tryjpy$long)
Error in sum(tryjpy$long) : invalid 'type' (character) of argument
cumsum(tryjpy$long)
[1] 0.0022 0.0020 -0.0129 -0.0152 -0.0494 -0.0739 -0.0761 -0.0758 -0.0759
[10] -0.0763 -0.0799 -0.0809 -0.0820 -0.0832 -0.0838 -0.0822 -0.0816
Which I guess is due to the following line in do_cum():
PROTECT(t = coerceVector(CAR(args), REALSXP));
This might be fine and there may be very good reasons why there is no
coercion in sum - just seems a little inconsistent in usage
Yes. I don't know the reason for this design, but please note it is
documented in ?sum and in ?cumsum, which would also make it harder to
change. One can always use a consistent subset (not rely on the coercion
e.g. from characters).
Best
Tomas
Cheers
-- Rory
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