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Hi! Let us define random variable: > x = seq(0,1,length=100) If we calculate variance following definition E[(x-E(x))^2] we get: > mean( (x - mean(x))^2 ) # == mean(x^2) - mean(x)^2 0.08501684 And if we use internal R function var: > var(x) 0.08587559 Can anyone tells me why the difference?

Hi! Does anyone know hot to save (to png, pdf, ...) only plot area. That is without box around, titles, axis, ... I tried: par(mar=c(0,0,0,0)) and it works for internal viewer (linux and windows). But when I save the image in png it adds that annoying margin around plot area. Any ideas? by, Tine

Hi! I was just wondering is there anyway to overload operator for custom class. For example: I have two matrices A and B with same dimensions. I want to overload operator '+' with my own function. Or even better can I create my own (new) operator. Example: A+-B where '+-' would be some function. bye, Tine

Hi! Does anyone know hot to set number of digits to be printed in function 'paste'? Tine Mla?