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Asked: 2026-06-09T06:21:07+00:00

I used the following code: data<-read.csv(‘/Users/mf/Desktop/acceptor.csv’) just_nums<-sapply(data,is.numeric) just_nums_data<-data[,just_nums] str(just_nums_data) heatmap(just_nums_data) But got this output:

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I used the following code:

data<-read.csv('/Users/mf/Desktop/acceptor.csv')
just_nums<-sapply(data,is.numeric)
just_nums_data<-data[,just_nums]
str(just_nums_data)
heatmap(just_nums_data)

But got this output:

data<-read.csv('/Users/mf/Desktop/acceptor.csv')
just_nums<-sapply(data,is.numeric)
just_nums_data<-data[,just_nums]
str(just_nums_data)
'data.frame':   622 obs. of  16 variables:
 ID                                 : int  1 2 4 5 6 7 8 9 10 11 ...
 QnWeight_initial                   : int  158 165 137 129 155 150 119 153 137 153 ...
 QnWeight_initial_mg                : num  15.8 16.5 13.7 12.9 15.5 15 11.9 15.3 13.7 15.3   ....
 Days_till_1st_Wrkr                 : int  NA 21 NA 26 NA 23 22 20 22 NA ...
 Days_before_max_Wrkr_Eclosion      : int  NA 12 NA 7 NA 10 11 13 11 NA ...
 Wrkr_Eclosion_Bin                  : int  NA 3 NA 1 NA 1 2 3 2 NA ...
 QnMass_At_Wrkr_Eclosion            : int  NA 83 NA 73 NA 67 53 78 56 NA ...
 ColonyMass_At_Wrkr_Eclosion        : int  NA 117 NA 53 NA 91 85 111 96 NA ...
 Adult_Wrkrs_At_Wrkr_Eclosion       : int  NA 9 NA 5 NA 1 7 3 2 NA ...
 Mature_Brood_At_Wrkr_Eclosion      : int  NA 25 NA 13 NA 17 18 27 28 NA ...
 Sum_wrkrsPlusBrood_At_Wrkr_Eclosion: int  0 34 0 18 0 18 25 30 30 0 ...
QnMass_2wksLater                   : int  NA 124 NA NA NA 111 NA NA NA NA ...
QnMass_4wksLater                   : int  NA 117 NA NA NA 88 NA NA NA NA ...
ColonyMass_4wksLater               : int  NA 571 NA NA NA 736 NA NA NA NA ...
QnMass_2mnthsLater                 : int  NA 118 NA NA NA 86 NA NA NA NA ...
ColonyMass_2mnthsLater             : int  NA 445 NA NA NA 1817 NA NA NA NA ...
heatmap(just_nums_data)
Error in heatmap(just_nums_data) : 'x' must be a numeric matrix

I guess my confusion lays in the fact that the type “int” satisfies is.numeric() but doesn’t count as numeric when it is passed to heatmap(). Is this what is wrong?

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1 Answer

  1. Editorial Team
    • heatmap requires x to be a numeric matrix (see ?heatmap).
    • It tests this by using is.numeric(x)
      or more specifically a numeric object with 2 dimensions

      • length(di <- dim(x)) != 2 || !is.numeric(x))
    • a data.frame is not a numeric matrix, even if all the columns are numeric

    For example:

    .d <- data.frame(x= 1:10, y = runif(10))
is.numeric(.d) 
## [1] FALSE

    So, you would need to run

    heatmap(as.matrix(just_nums_data))
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