"length of 'dimnames' [2] not equal to array extent" on one of two very similar sets

Question

I collected data in two data frames vols and flow. The latter can be converted to matrix but the first not:

as.matrix(vols)
Error in `colnames<-`(`*tmp*`, value = c("CanovesSamalus", "Llinars",  : 
  length of 'dimnames' [2] not equal to array extent

What is amiss?

> vols[1:3,]
    data CanovesSamalus Llinars LlinarsCanoves Mirador Santacana StAntoniVilamajor   N1    N3   N4   N7   N9
1 2011-01-01             NA  172.66       3779.832 453.096  4996.344           1830.09 9898 9898 9898 9898 9898
2 2011-01-02             NA  172.66       3809.036 494.977  4699.088           1712.43 9898 9898 9898 9898 9898
3 2011-01-03             NA  172.66       3134.215 517.979  4319.374           1716.67 9898 9898 9898 9898 9898

> str(vols)
List of 12
 $ data             : Date[1:365], format: "2011-01-01" "2011-01-02" "2011-01-03" "2011-01-04" ...
 $ CanovesSamalus   : num [1:365] NA NA NA NA NA NA NA NA NA NA ...
 $ Llinars          : num [1:365] 173 173 173 172 172 ...
 $ LlinarsCanoves   : num [1:365] 3780 3809 3134 3221 3113 ...
 $ Mirador          : num [1:365] 453 495 518 516 495 ...
 $ Santacana        : num [1:365] 4996 4699 4319 4276 4179 ...
 $ StAntoniVilamajor: num [1:365] 1830 1712 1717 1671 1733 ...
 $ N1               : num [1:365] 9898 9898 9898 9898 9898 ...
 $ N3               : num [1:365] 9898 9898 9898 9898 9898 ...
 $ N4               : num [1:365] 9898 9898 9898 9898 9898 ...
 $ N7               : num [1:365] 9898 9898 9898 9898 9898 ...
 $ N9               : num [1:365] 9898 9898 9898 9898 9898 ...
 - attr(*, "row.names")= int [1:365] 1 2 3 4 5 6 7 8 9 10 ...
 - attr(*, "idvars")= chr "data"
 - attr(*, "rdimnames")=List of 2
  ..$ :'data.frame':    365 obs. of  1 variable:
  .. ..$ data: Date[1:365], format: "2011-01-01" "2011-01-02" "2011-01-03" "2011-01-04" ...
  ..$ :'data.frame':    6 obs. of  1 variable:
  .. ..$ node: Factor w/ 6 levels "CanovesSamalus",..: 1 2 3 4 5 6

and:

> flow[1:3,]
    data N8FT01001 N9FT00201 N9FT00401 N9FT00402 N9FT00403 N9FT00801 N9FT01001 N9FT01002 N9FT01101 N9FT01201 N9FT01202
1 2011-01-01      7123         0      2113      3105       172       791      3909      2489      1188      1182      1135
2 2011-01-02      4197         0      1984      1887       152       801      2255      2449      1227      1221      1090
3 2011-01-03      3685         0      2221      1664        27       769      1969      2516      1512      1509      1400
N9FT01301 N9FT01401
1       118       119
2       114       115
3        77        78


> str(flow)
List of 14
 $ data     : Date[1:365], format: "2011-01-01" "2011-01-02" "2011-01-03" "2011-01-04" ...
 $ N8FT01001: int [1:365] 7123 4197 3685 4616 4534 6024 3118 5977 5455 2845 ...
 $ N9FT00201: int [1:365] 0 0 0 0 0 0 0 0 0 0 ...
 $ N9FT00401: int [1:365] 2113 1984 2221 2010 1994 1776 2049 1953 2068 2028 ...
 $ N9FT00402: int [1:365] 3105 1887 1664 2066 2004 2741 1395 2645 2563 1064 ...
 $ N9FT00403: int [1:365] 172 152 27 4 14 180 14 166 155 5 ...
 $ N9FT00801: int [1:365] 791 801 769 789 688 663 730 732 767 694 ...
 $ N9FT01001: int [1:365] 3909 2255 1969 2487 2467 3198 1681 3249 2812 1740 ...
 $ N9FT01002: int [1:365] 2489 2449 2516 2551 2582 2476 2513 2582 2584 2602 ...
 $ N9FT01101: int [1:365] 1188 1227 1512 1236 1317 1006 1449 1171 1327 1345 ...
 $ N9FT01201: int [1:365] 1182 1221 1509 1232 1313 1002 1445 1167 1321 1341 ...
 $ N9FT01202: int [1:365] 1135 1090 1400 1112 1236 922 1283 1048 1218 1137 ...
 $ N9FT01301: int [1:365] 118 114 77 92 102 102 137 115 133 174 ...
 $ N9FT01401: int [1:365] 119 115 78 93 103 103 138 116 134 175 ...
 - attr(*, "row.names")= int [1:365] 1 2 3 4 5 6 7 8 9 10 ...
 - attr(*, "idvars")= chr "data"
 - attr(*, "rdimnames")=List of 2
  ..$ :'data.frame':    365 obs. of  1 variable:
  .. ..$ data: Date[1:365], format: "2011-01-01" "2011-01-02" "2011-01-03" "2011-01-04" ...
  ..$ :'data.frame':    13 obs. of  1 variable:
  .. ..$ TAG: Factor w/ 13 levels "N8FT01001","N9FT00201",..: 1 2 3 4 5 6 7 8 9 10 ...

Answer 1

It is unclear how you created those data.frames. From the str output they appear not to be ordinary data.frames but some other kind of lists, so it might be necessary to convert your objects to data.frames first. Use as.matrix(as.data.frame(vols)).