for-loop

问题 I am trying to find an empty cell in a specific column in google sheets. I am familiar with getLastRow(), but it returns the last row in whole sheet. I want to get the first empty cell in a specific column. So, I used a for loop and if. But I don't know why it is not working. The problem is that for loop does not return anything. I am getting 10 rows of the column H (position 8) in the sheet test (line2). first 5 rows already have content. Data will be added to this cell later using another

问题 I am trying to find an empty cell in a specific column in google sheets. I am familiar with getLastRow(), but it returns the last row in whole sheet. I want to get the first empty cell in a specific column. So, I used a for loop and if. But I don't know why it is not working. The problem is that for loop does not return anything. I am getting 10 rows of the column H (position 8) in the sheet test (line2). first 5 rows already have content. Data will be added to this cell later using another

问题 I would like to put vertical lines and labels for the vertical lines for each graph in a loop. the position of the line is saved in a dataframe "grid". Although the position of the line seems correct the label value and its position is off. My question is why. library(ggplot2) library(grid) library(gridExtra) plots <- list() grid <- data.frame(x=seq(4), y=c(200, 400, 600, 800)) for (i in 1:4) { V1 <- rnorm(1000) V2 <- seq(1000) df <- data.frame(V1, V2) plots[[i]] <- ggplot(df, aes(x= V2, y=V1

问题 Based on the answers of this question, I tried to write the following codes: for(var in names(Auto)) {print(var)} "mpg" [1] "cylinders" [1] "displacement" [1] "horsepower" [1] "weight" [1] "acceleration" [1] "year" [1] "origin" Ok, my name variables are in names(Auto), then I moved on: for(var in names(Auto)) { summary(lm(paste('mpg ~', var), data = Auto)) } Warning messages: 1: In model.matrix.default(mt, mf, contrasts) : the response appeared on the right-hand side and was dropped 2: In

问题 everyone. Recently, I have been working to add 'Read More' and 'Read Less' buttons through Javascript. I am able to do that only once for one specific element by picking its ID. But, I want that to happen several times for several other similar elements. I tried storing the IDs or Classnames in a variable and then looping through it but it's not working. Can you please have a look at the Javascript code and suggest how can I achieve the same functionality for several other elements. Here's

问题 df var1 var2 1 a 1 2 b 2 3 a 3 4 c 6 5 d 88 6 b 0 df2 <- data.frame(var1=c("k","b","a","k","k","b"),var2=c(14,78,5,6,88,0)) > list <- list(df,df2) for(i in list){ if(any(i[ ,1] == i[ ,1})){ cumsum(.) } } I have a list containing of data.frames. I want to iterate over these data.frames. When there is the same letter in the first column, then the sum should be calculated. I want this new row to be in my data.frame. I completely messed up the if statement . Can somebody help me please? EDIT: the

问题 I'm a beginner in R programming. I'm trying to use a for loop with the sprintf function. Without the for loop the function works pretty well: var=2 sprintf("I want to print this number: %d",var) The output: "I want to print this number: 2" Oddly for me, when I use for I don't have any outputs: for (var in 1:10) { sprintf('I want to print this number: %d', var) } Why is this happening? is there another function which can make this for me? 回答1: You need to wrap it in cat() : for (var in 1:10) {

问题 i have a dataframe that looks like this : Words Start_time(in sec) End_time(in secs) Total_Time_words 0 let 0.1 2.5 2.6 1 me 2.5 2.6 5.1 2 tell 2.6 2.9 5.5 3 you 2.9 3.0 5.9 4 about 3.0 3.2 6.2 I want to select only "Start_time(in sec)" and "End_time(in secs)" column so per index so that i can use it to look for time frame across the second dataframe so that i can now slect the top 5 amplitude of each and take the mean. for example index 0 : between 0.1 and 2.5 on this dataframe below and do

问题 With the Python (2.7) ternary expression x if cond else y what is the logical order when evaluating multiple expressions of these nested in order: e.g. 1 if A else 2 if B else 3 Drawing out the truth table for this is appears this is evaluated as 1 if A else (2 if B else 3) rather than (1 if A else 2) if B else 3 : A True False B True 1 2 False 1 3 Could someone please explain why this is executed in this order, and possibly suggest some material that gives an intuition about why this is used

问题 This question already has answers here : How can I remove a specific item from an array? (96 answers) Closed 2 years ago . I am using Visual Studio Code. I am trying to return an array with only odd numbers using JavaScript. This is the code: function oddCouple(arr) { for (let i = 0; i < arr.length; i++) { if (arr[i] % 2 == 0) { delete arr[i]; } } return arr; } console.log(oddCouple([2, 6, 7, 0, 1, 3, 7, 5])); This is what I am getting. I do not want the empty items, just odd numbers. [ <2