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...g(x) : production de NaN Please forgive the French; it is my study language. Quite frankly I don't mind if I don't get the bonus marks, what is really important is that I understand why it doesn't work and what condition is missing. You're help would be kindly appreciated. Curtis MOYO [[alternative HTML version deleted]]

This is day one on R for me, I am trying to figure out how to do simple computations. For example I have a data set with 200 observations. I am trying to compute the mean and variance in r for 1:25 (first 25 observations); 1:50 (first 50 obs) ; 1:100th observation etc. Here is the dataset: Id value 1 2.2338 2 3.13597 3 1.98685 4 4.35593 5 2.43963 6 4.20262 7 3.12131 8 4.79583 9 3.13937 10

Hello I am using SYSLINUX to boot from a USB key. It works well. However, it appears to only use USB 1.x speed (rather than 2.x) when files are being booted. Is this the case or is there an option to select the faster mode? Thank you. Best regards Nick