library( miscTools ) eps <- 1e-7 x <- (-40:40)/10 ## standard normal distribution ddnorm( x ) all.equal( ddnorm(x), ( dnorm( x + eps ) - dnorm( x - eps ) ) / ( 2 * eps ) ) ## normal distribution (non-standard) x <- (0:100)/10 ddnorm( x, mean = 5, sd = 2 ) all.equal( ddnorm( x, mean = 5, sd = 2), ( dnorm( x + eps, mean = 5, sd = 2 ) - dnorm( x - eps, mean = 5, sd = 2 ) ) / ( 2 * eps ) )
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