Web72. For a data frame df, you can get df.new as: df.new = df [seq (1, nrow (df), 5), ] This creates an index from row 1 to nrow (number of rows of the table) every 5 rows. You … WebOct 26, 2024 · remove [c (TRUE, FALSE)] will do the trick. How it works? If logical vectors are used for indexing in R, their values are recycled if the index vector is shorter than the vector containing the values. Here, the vector remove contains ten values. If the index vector c (TRUE, FALSE) is used, the actual command is: remove [c (TRUE, FALSE, TRUE ...
How to extract every nth element of a vector using R
WebDec 8, 2014 · The following represents a command which can be used to extract a column as a data frame. If you use a command such as df [,1], the output will be a numeric vector (in this case). To get the... WebUse stripe (n, from = m) to get every nth row/column starting at row/column m. Use dplyr functions like starts_with, contains and matches to specify columns (but not rows). See tidyselect::language for a full list. The gory details How the row and col arguments are parsed depends on the number of arguments passed to the set_* function. gio seamed stockings
How to Retrieve Every Nth Value in a Range in Excel
WebJul 10, 2024 · score:11 If you want to extract 5,10... newdf <- df [c (rep (FALSE,4),TRUE), ] If 1,6,11, newdf <- df [c (TRUE,rep (FALSE,4)), ] bartektartanus 14309 score:33 One dplyr possibility for this task could be: df %>% slice (which (row_number () %% 5 == 1)) count Idf_Nr block 1 1 1233 B12 2 6 365 B12 3 11 1092 B12 4 16 1266 B12 5 21 1074 B12 Or: WebMay 2, 2024 · If you really what every 10th frame from video then you can use select with modulo 10 ffmpeg -i out1.mp4 -vf "select=not (mod (n\,10))" -vsync vfr image_%03d.jpg but it may gives more images than before. If video has 25fps then -r 1 gives image every 25th frame. And if video has 60fps then gives image every 60th frame. fully remove buddypress