Sample random rows in dataframe

First make some data:

> df = data.frame(matrix(rnorm(20), nrow=10))
> df
           X1         X2
1   0.7091409 -1.4061361
2  -1.1334614 -0.1973846
3   2.3343391 -0.4385071
4  -0.9040278 -0.6593677
5   0.4180331 -1.2592415
6   0.7572246 -0.5463655
7  -0.8996483  0.4231117
8  -1.0356774 -0.1640883
9  -0.3983045  0.7157506
10 -0.9060305  2.3234110

Then select some rows at random:

> df[sample(nrow(df), 3), ]
           X1         X2
9  -0.3983045  0.7157506
2  -1.1334614 -0.1973846
10 -0.9060305  2.3234110

Related Posts:

  1. Counting the number of elements with the values of x in a vector
  2. Replace all 0 values to NA
  3. How can I change the name of a data frame
  4. R Hex to RGB converter
  5. Reasons for using the set.seed function
  6. Non-numeric Argument to Binary Operator Error in R
  7. Error in ggplot.data.frame : Mapping should be created with aes or aes_string
  8. Error in file(file, “rt”) : invalid ‘description’ argument in complete.cases program
  9. SummarySE (Rmisc package) to produce a barplot with error bars (ggplot2)
  10. Editing legend (text) labels in ggplot
  11. Logistic Regression on factor: Error in eval(family$initialize) : y values must be 0 <= y <= 1
  12. R – longer object length is not a multiple of shorter object length
  13. Error: attempt to use zero-length variable name
  14. “non-numeric argument to binary operator” error in R
  15. Replace all particular values in a data frame
  16. What does “The following object is masked from ‘package:xxx'” mean?
  17. How can I convert Json to data frame in R
  18. Error in xj[i] : invalid subscript type ‘list’
  19. How do you specifically order ggplot2 x axis instead of alphabetical order?
  20. Error in : target of assignment expands to non-language object
  21. R error: “New Column would leave holes after existing columns”
  22. Error: Invalid number of ‘breaks’ in R
  23. Batch convert columns to numeric type
  24. Deleting rows that are duplicated in one column based on the conditions of another column
  25. What is the difference between require() and library()?
  26. What is the meaning of the dollar sign “$” in R function()?
  27. Use of ~ (tilde) in R programming Language
  28. Convert data.frame column to a vector?
  29. Converting from a character to a numeric data frame
  30. In R, dealing with Error: ggplot2 doesn’t know how to deal with data of class numeric
  31. Renaming column names in Pandas
  32. t-stat for feature selection
  33. Could not find function “%<>%” with dplyr loaded
  34. Interpreting “condition has length > 1” warning from `if` function
  35. Truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all()
  36. Get statistics for each group (such as count, mean, etc) using pandas GroupBy?
  37. ggplot2 line chart gives “geom_path: Each group consist of only one observation. Do you need to adjust the group aesthetic?”
  38. Error: could not find function “%>%”
  39. Adding new column to existing DataFrame in Python pandas
  40. How to change the order of DataFrame columns?
  41. R: Using equation with natural logarithm in nls
  42. How do I select rows from a DataFrame based on column values?
  43. Error in Confusion Matrix : the data and reference factors must have the same number of levels
  44. How do I generate random integers within a specific range in Java?
  45. How do I get the row count of a Pandas DataFrame?
  46. How can I randomly select an item from a list?
  47. Convert pandas dataframe to NumPy array
  48. Having trouble setting working directory
  49. Add color to boxplot – “Continuous value supplied to discrete scale” error
  50. case_when in mutate pipe
  51. How do I get the row count of a Pandas DataFrame?
  52. Error in plot.window(…) : need finite ‘xlim’ valuescc
  53. Longer object length is not a multiple of shorter object length?
  54. dim(X) must have a positive length when applying function in data frame
  55. Persistent invalid graphics state error when using ggplot2
  56. ‘DataFrame’ object has no attribute ‘sort’
  57. Error in lm.fit(x, y, offset = offset, singular.ok = singular.ok, …) : NA/NaN/Inf in ‘y’, tried every possible way
  58. Rename Pandas DataFrame Index
  59. Convert DataFrame column type from string to datetime, dd/mm/yyyy format
  60. Subscript out of bounds – general definition and solution?
  61. Get a list from Pandas DataFrame column headers
  62. Plot a line graph, error in xy.coords(x, y, xlabel, ylabel, log) : ‘x’ and ‘y’ lengths differ
  63. Sum rows in data.frame or matrix
  64. R: “Unary operator error” from multiline ggplot2 command
  65. invalid type (list) for variable
  66. not a Stata version 5-12 .dta file
  67. How to subset a Data frame column wise using column names?
  68. Shuffle DataFrame rows
  69. Random float number generation
  70. How to move or position a legend in ggplot2
  71. Nested ifelse statement
  72. Plot multiple lines (data series) each with unique color in R
  73. Selecting/excluding sets of columns in pandas
  74. How to overcome error:”attempt to set ‘colnames’ on an object with less than two dimension” in xts object
  75. How to avoid “Error in stripchart.default(x1, …) : invalid plotting method” error?
  76. Data type conversion error: ValueError: Cannot convert non-finite values (NA or inf) to integer
  77. What’s the difference between facet_wrap() and facet_grid() in ggplot2?
  78. Error in file(filename, “r”, encoding = encoding) : cannot open the connection
  79. How do I convert a factor into date format?
  80. Write lines of text to a file in R
  81. Error:attempt to apply non-function
  82. Efficiently sum across multiple columns in R
  83. “no function to return from, jumping to top level”
  84. Is there a simple way to make a random selection from an array in JavaScript or any other programming language?
  85. pandas comparison raises TypeError: cannot compare a dtyped [float64] array with a scalar of type [bool]
  86. Error in x[[i]] : recursive indexing failed at level 2
  87. Merge error : negative length vectors are not allowed
  88. Fastest way to generate a random boolean
  89. Getting the IP address of the current machine using Java
  90. How to avoid “operations are possible only for numeric, logical or complex types” when computing top 3 elements in each group
  91. What does is.na() applied to non-(list or vector) of type ‘NULL’ mean?
  92. error r: invalid subscript type “closure” in a simple regression
  93. why nrow(dataframe) and length(dataframe) in r give different results?
  94. Meaning of objects being masked by the global environment
  95. Difference between as.POSIXct/as.POSIXlt and strptime for converting character vectors to POSIXct/POSIXlt
  96. cbind warnings : row names were found from a short variable and have been discarded
  97. Error: x must be atomic for ‘sort.list’
  98. Transposing in dplyr
  99. How to calculate combination and permutation in R?
  100. Java: Variable is already defined in method

Leave a Comment