devices/pci0000:00/0000:00:14.0/usb3/3-6/3-6:1.0/0003:20A0:0001.0001/input/input4
[ 78.604675] input: flirc.tv flirc System Control as /devices/pci0000:00/0000:00:14.0/usb3/3-6/3-6:1.0/00
所以我知道你可以通过做:D(expression(x^3-6*x^2), 'x')来找到类似于"x^3-6*x^2“的导数,但是如果我需要找到一列值的一阶导数最大值,比如:
value <- c(610,618,627,632,628,634,634,628,634,642,637,643,653,666,684,717,787,923,1197,1716,2638,4077,5461,7007,8561,9994,11278,12382,13382,14252