signup<-function(x, digits = 6)
# Function parameters:
#x - vector to round up (numeric)
#digits - number of significant numbers (integer)
ceiling(x/10^(ceiling(log10(x))-digits))*10^(ceiling(log10(x))-digits)
signdown<-function(x, digits = 6)
#x - vector to round down (numeric)
#digits - number of significant numbers (integer)
floor(x/10^(ceiling(log10(x))-digits))*10^(ceiling(log10(x))-digits)
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