Home/ Questions/The complete guide to the ''error in dimnames(x) <- dn : length of 'dimnames' [2] not equal to array extent'' issue.
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Freya Morton
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Asked: 2022-05-18T21:47:35+00:00 In:

The complete guide to the ”error in dimnames(x) <- dn : length of ‘dimnames’ [2] not equal to array extent” issue.

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I am tired of fixing the problem: error in dimnames(x) <- dn : length of ‘dimnames’ [2] not equal to array extent in the r; even if I get the reference from another forum, it still returns an error:

Error in `colnames<-`(`*tmp*`, value = c(6, 7, 8, 9, 10, 11, 12)) : 
  length of 'dimnames' [2] not equal to array extent

To identify the problem, I will show you the detail here:

layout(matrix(c(1, 1, 2, 2, 3, 3, 4, 4, 5), ncol=1))
 
 # main plots
 par(mai=rep(0.5, 4))
 
 fcm <-c(14.0,14.1,13.0,14.2,14.7,13.8,14.0)
 gk <-c(12.1,12.5,12.2,12.0,11.5,12.0,11.4)
 gg <-c(14.0,14.1,13.3,12.8,12.0,12.2,12.0)
 data1 <- rbind(fcm,gk,gg)
 colnames(data1) <- c(6,7,8,9,10,11,12)
 
 fcm <-c(2.65,2.55,2.4,2.45,2.45,2.5,2.45)
 gk <-c(2.45,2.55,2.4,2.3,2.2,2.35,2.1)
 gg <-c(2.6,2.65,2.5,2.35,2.4,2.4,2.2)
 data2 <- rbind(fcm,gk,gg)
 colnames(data2) <- c(6,7,8,9,10,11,12)
 
 fcm <-c(8.8,6.5,6.6,8.2,8.0,8.4,9.0)
 gk <-c(12.7,11.0,11.1,10.5,10.7,10.0,9.5)
 gg <-c(2.1,2.1,1.8,2.0,2.0,1.9,1.8)
 data3 <- rbind(fcm,gk,gg)
 colnames(data3) <- c(6,7,8,9,10,11,12)
 
 fcm <-c(0.47,0.53,0.45,0.39,0.40,0.47,0.48)
 gk <-c(0.45,0.51,0.34,0.40,0.42,0.42,0.44)
 data4 <- rbind(fcm,gk)
 colnames(data4) <- c(6,7,8,9,10,11,12)
 
 barplot(as.matrix(data1),ylim=c(0,20),main="P wave",
  xlab="number of clusters", ylab="traveltime rms(ms)",
  col=c("red", "black", "green"), beside=TRUE)
 barplot(as.matrix(data2),ylim=c(0,2),main="MT",
  xlab="number of clusters", ylab="MT functions",
  col=c("red", "black", "green"), beside=TRUE)
 barplot(as.matrix(data3),ylim=c(0,20),main="XBI",
  xlab="number of clusters", ylab="index value",
  col=c("red", "black", "green"), beside=TRUE)
 barplot(as.matrix(data4),ylim=c(0,0.6),main="NCE",
  xlab="number of clusters", ylab="index value",
  col=c("red", "black"), beside=TRUE)
 
 par(mai=c(0,0,0,0))
 plot.new()
 legend(legend = c("fcm","gk","gg"), fill = c( "red", "black", "green"), 
  "center", horiz=TRUE)

How do I do that? Could you support me in improving this problem?

length of dimnames not equal to array extent
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1 Answer

  1. Best Answer
    Expert

    The cause:

    You have got this error because you are having 8 columns but you only provide 7 collumn names for them. It shows up obviously in your program:

    > length(fcm)
[1] 8

    Or

    > ncol(data1)
[1] 8

    Even the matrix is shown:

    > data1
# [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8]
#fcm 14.0 14.1 13.0 14 2.0 14.7 13.8 14.0
#gk 12.1 12.5 12.2 12 0.0 11.5 12.0 11.4
#gg 14.0 14.1 13.0 3 12.8 12.0 12.2 12.0

    At the time

    > length( c(6, 7, 8, 9, 10, 11, 12))
[1] 7

    Solution:

    To solve this error, you can try:

    colnames(data1) <- c(6:13)

    Let’s do as the following command for your data:

    fcm <-c(14.0,14.1,13.0,14,2,14.7,13.8,14.0)
gk <-c(12.1,12.5,12.2,12,0,11.5,12.0,11.4)
gg <-c(14.0,14.1,13,3,12.8,12.0,12.2,12.0)
data1 <- rbind(fcm,gk,gg)
colnames(data1) <- c(6:13)

    Then, it gives the result without any error:

    > data1
6 7 8 9 10 11 12 13
fcm 14.0 14.1 13.0 14 2.0 14.7 13.8 14.0
gk 12.1 12.5 12.2 12 0.0 11.5 12.0 11.4
gg 14.0 14.1 13.0 3 12.8 12.0 12.2 12.0

    Your error has been fixed successfully.

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