calculate the mean for each column of a matrix in R

Question

I am working on R in R studio  I need to calculate the mean for each column of a data frame    cluster1     5 by 4 data frame  mean cluster1        I got       Warning message    In mean default cluster1      argument is not numeric or logical  returning NA   But I can use           mean cluster1  1      to get the mean of the first column    How to get means for all columns     Any help would be appreciated

User · Answer

You can use  apply  to run a function or the rows or columns of a matrix or numerical data frame   cluster1  lt - data frame a 1 5  b 11 15  c 21 25  d 31 35   apply cluster1 2 mean     applies function  mean  to 2nd dimension  columns   apply cluster1 1 mean     applies function to 1st dimension  rows   sapply cluster1  mean     also takes mean of columns  treating data frame like list of vectors

User · Answer

Another way is to use purrr package     example data like what is said above    A Handcart And Mohair  set seed 1  m  lt - data frame matrix sample 100  20  replace   TRUE   ncol   4     library purrr  means  lt - map dbl m  mean    gt  means    X1   X2   X3   X4   47 0 64 4 44 8 67 8

User · Answer

class mtcars  my mean  lt - unlist lapply mtcars  mean    my mean       mpg        cyl       disp         hp       drat         wt       qsec         vs   20 090625   6 187500 230 721875 146 687500   3 596563   3 217250  17 848750   0 437500          am       gear       carb    0 406250   3 687500   2 812500

User · Answer

For diversity  Another way is to converts a vector function to one that works with data frames by using plyr  colwise    set seed 1  m  lt - data frame matrix sample 100  20  replace   TRUE   ncol   4    plyr  colwise mean  m        X1   X2   X3   X4   1 47 64 4 44 8 67 8

User · Answer

In case you have NA s   sapply data  mean  na rm   T         Returns a vector  with names     lapply data  mean  na rm   T         Returns a list     Remember that  mean  needs numeric data  If you have mixed class data  then use    numdata lt -data sapply data  is numeric     sapply numdata  mean  na rm   T     Returns a vector lapply numdata  mean  na rm   T     Returns a list

User · Answer

You can use colMeans       Sample data set seed 1  m  lt - data frame matrix sample 100  20  replace   TRUE   ncol   4        Your error mean m     1  NA   Warning message    In mean default m    argument is not numeric or logical  returning NA      The result using  colMeans  colMeans m      X1   X2   X3   X4    47 0 64 4 44 8 67 8

User · Answer

try it   also can calculate NA s data   df  lt - data frame a1 1 10  a2 11 20   df   gt   summarise each funs  mean    na rm   TRUE        a1   a2   5 5 15 5

User · Answer

You can try this   mean as matrix cluster1

[r] calculate the mean for each column of a matrix in R

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