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When charging my phone, a LG K8 V, I get the message “Charging slowly: Use the charger and cable that were provided with this phone, or check the cable is properly connected.” The charge rate is fast enough for my purposes (I haven’t noticed an actual slowdown) and everything’s plugged in properly so far asRead more

I have replaced the battery in my Galaxy S5 with a genuine Samsung (or at least, a very, very good fake!). It’s now becoming quite noticeable how slow it charges – when plugged into a Nexus 7 2A charger (I have lost the Samsung original), using a USB ammeter, I can see it drawing aroundRead more

I have a list lst matching the pattern {{_String, _String, _?NumericQ, _?NumericQ}..}. The outer list has about 150,000 elements (inner lists), so it is certainly not very long. When I run: lst // GroupBy[(#[[2]] &) -> (Drop[#, {2}] &)] // Map[GroupBy[First -> Rest]] the code takes about 0.4 seconds to return the result. But whenRead more