numeric

问题 I am very new to Kivy, and have found an online example for a simple calculator here that I would like to try to modify using the Kivy examples ~/examples/keyboard/main.py. In that example is a numeric keyboard, but I can't seem to figure out how to get it to appear instead of the standard keyboard. Help or suggestions would be greatly appreciated. Here is what I have started with: from kivy.app import App from kivy.lang import Builder from kivy.uix.floatlayout import FloatLayout from kivy

问题 I am trying to reclass the following xts series since columns 1-8 are character and are suppose to be numeric, columns 9-10 are character as they are suppose to be..... # data x <- structure(c(NA, NA, "41.95", "30.55", "29.05", "23.71", NA, "23.80", NA, NA, "18.67", NA, "16.90", "17.10", "14.90", "13.64", "12.70", "11.65", "10.75", " 9.75", " 9.05", " 7.95", " 6.70", " 6.02", " 5.05", NA, NA, " 0.00", " 0.00", " 0.28", "-0.29", NA, " 0.00", NA, NA, "-1.28", NA, "-1.10", " 0.00", "-0.30", "-1

问题 In most cases,we convert numeric time to posixct format using R. However, sometimes, we want to compare which time point is earlier, then we would prefer the numeric time format. Thus, it's quite practical question to convert time format to numeric. For example,I have the data format like "2001-03-13 10:31:00", begin <- "2001-03-13 10:31:00" Using R, I want to figure out how to covert it into a numeric, e.g. the Julian time, something like the passing seconds between 1970-01-01 00:00:00 and

问题 Suppose x is a real number, or a vector. i is valued-False. Then x[i] will return numeric(0). I would like to treat this as a real number 0, or integer 0, which are both fit for addition. numeric(0) added to any real number will return numeric(0), whereas I wish to obtain the real number being added as the result. What can I do to convert the numeric (0) value? Thanks in advance! 回答1: It is only when we do the + , it is a problem. This can be avoided if we use sum sum(numeric(0), 5) #[1] 5

来源： https://stackoverflow.com/questions/63747113/convert-data-frame-with-type-of-list-into-a-numeric-dataframe-i-can-run-analyses

来源： https://stackoverflow.com/questions/63747113/convert-data-frame-with-type-of-list-into-a-numeric-dataframe-i-can-run-analyses

来源： https://stackoverflow.com/questions/13870845/converting-from-an-integer-to-its-binary-representation

来源： https://stackoverflow.com/questions/62635535/how-r-automatically-coerces-character-input-to-numeric

来源： https://stackoverflow.com/questions/13851292/casting-between-number-types-in-golang

来源： https://stackoverflow.com/questions/30314007/find-nearest-smaller-number