conditional

问题 I would like to create a column d, which includes all the non-NA values from the other columns. I tried ifelse, but cannot figure out how to make it nested in the proper manner, so that the value in column c is included as well.. Perhaps something else than ifelse should be used? Here is a "dummy" dataframe: a <- c(NA, NA, NA, "A", "B", "A", NA, NA) b <- c("D", "A", "C", NA, NA, NA, NA, NA) c <- c(NA, NA, NA, NA, NA, NA, "C", NA) data <- data.frame(a, b, c) I would like the d column to look

问题 Data flag 2017-01-01 17.2 False 2017-01-02 17.0 False 2017-01-03 16.8 False 2017-01-04 18.3 False 2017-01-05 19.1 True ... 2017-12-28 20.1 False 2017-12-29 19.8 False 2017-12-30 18.9 False 2017-12-31 19.5 False There is a pandas dataframe that has values and flag. I want to calculate mean values by rolling(window=30), if the flag is "NOT TRUE". 回答1: You can use pandas.rolling_mean() while subsetting the dataframe to only include entries where df.flag is false (the ~ operator inverts the truth

问题 I'm trying to create a 2 step job in Jenkins. I want the second step only to run if the first step fails. (The first step executes a unit test to see if the code I'm compiling is good - if it is not then i want to run some diagnostics in the second step). The conditional step plug seems a good choice for this. However, I can't work out how to use the conditional step plug in to cause the second step to run when the first step fails. The conditional step plug in offers a list of conditions

问题 I've seen something along the lines of if ! some-command; then #do something fi What's the effect of the exclamation point? I see that if you use brackets, it can be used for negation. Is that the same effect here? 回答1: As documented in man bash : If the reserved word ! precedes a pipeline, the exit status of that pipeline is the logical negation of the exit status as described above. 回答2: Correct. Here is a code sample: anny ~> if ! grep $USER /etc/passwd More input> then echo "your user

问题 I've seen something along the lines of if ! some-command; then #do something fi What's the effect of the exclamation point? I see that if you use brackets, it can be used for negation. Is that the same effect here? 回答1: As documented in man bash : If the reserved word ! precedes a pipeline, the exit status of that pipeline is the logical negation of the exit status as described above. 回答2: Correct. Here is a code sample: anny ~> if ! grep $USER /etc/passwd More input> then echo "your user

问题 I've seen something along the lines of if ! some-command; then #do something fi What's the effect of the exclamation point? I see that if you use brackets, it can be used for negation. Is that the same effect here? 回答1: As documented in man bash : If the reserved word ! precedes a pipeline, the exit status of that pipeline is the logical negation of the exit status as described above. 回答2: Correct. Here is a code sample: anny ~> if ! grep $USER /etc/passwd More input> then echo "your user

问题 This question already has an answer here : Change value of variable with dplyr [duplicate] (1 answer) Closed 2 years ago . I want to replace the values in one column that match a certain condition with values in that same row from a different column. Consider this example: library(tidyverse) data <- tribble( ~X25, ~Other, "a", NA, "b", NA, "Other", "c", "Other", "d" ) View(data) # Works to change values in X25 within(data, { X25 <- ifelse(X25 == "Other", Other, X25) }) # Changes values in X25

问题 In JavaScript, what is the difference between using true ? 'Hello' : 'Goodbye' //Evaluates to "Hello" false ? 'Hello' : 'Goodbye' //Evaluates to "Goodbye" and true && 'Hello' || 'Goodbye' //Evaluates to "Hello" false && 'Hello' || 'Goodbye' //Evaluates to "Goodbye" 回答1: These are two different concepts that happen to give you the same answer. The first example uses the ternary operator and its result depends only on the first operand (in your example true / false ): true ? 'Hello' : 'Goodbye'

问题 I have some simple if... elif... in my python3.6 (& OpenCV 4.0), but no matter what I do I keep getting strange error messages. I need to crop some pics according to some bounding boxes. # the image to be cropped loads here: tobecropped= cv2.imread(img) images.append(tobecropped) (imageheight, imagewidth) = tobecropped.shape[:2] # sample bounding box: y = 833 # center vertically x = 183 # center horizontally width = 172 height = 103 # calculation of cropping values adding 10% extra: y1 = y-

问题 I am parsing file and I want to check each line against a few complicated regexs. Something like this if re.match(regex1, line): do stuff elif re.match(regex2, line): do other stuff elif re.match(regex3, line): do still more stuff ... Of course, to do the stuff, I need the match objects. I can only think of three possibilities, each of which leaves something to be desired. if re.match(regex1, line): m = re.match(regex1, line) do stuff elif re.match(regex2, line): m = re.match(regex2, line) do