Erreur dans seq.default (de = min (x, na.rm = TRUE), à = max (x, na.rm = TRUE),: 'from' ne peut pas être NA, NaN ou infini

Question

J'utilise . R apprenant dans Knime Je veux discrétiser une matrice, qui est la suivante:

> my_matrix= as(knime.in,"matrix"); 
> dput(head(my_matrix, 5)) 
structure(c("KS", "OH", "NJ", "OH", "OK", "128", "107", "137", 
" 84", " 75", "415", "415", "415", "408", "415", "No", "No", 
"No", "Yes", "Yes", "Yes", "Yes", "No", "No", "No", "25", "26", 
" 0", " 0", " 0", "265.1", "161.6", "243.4", "299.4", "166.7", 
"110", "123", "114", " 71", "113", "45.07", "27.47", "41.38", 
"50.90", "28.34", "197.4", "195.5", "121.2", " 61.9", "148.3", 
" 99", "103", "110", " 88", "122", "16.78", "16.62", "10.30", 
" 5.26", "12.61", "244.7", "254.4", "162.6", "196.9", "186.9", 
" 91", "103", "104", " 89", "121", "11.01", "11.45", " 7.32", 
" 8.86", " 8.41", "10.0", "13.7", "12.2", " 6.6", "10.1", " 3", 
" 3", " 5", " 7", " 3", "2.70", "3.70", "3.29", "1.78", "2.73", 
"1", "1", "0", "2", "3", "False", "False", "False", "False", 
"False"), .Dim = c(5L, 20L), .Dimnames = list(c("Row0", "Row1", 
"Row2", "Row3", "Row4"), c("State", "Account length", "Area code", 
"International plan", "Voice mail plan", "Number vmail messages", 
"Total day minutes", "Total day calls", "Total day charge", "Total eve minutes", 
"Total eve calls", "Total eve charge", "Total night minutes", 
"Total night calls", "Total night charge", "Total intl minutes", 
"Total intl calls", "Total intl charge", "Customer service calls", 
"Churn"))) 

J'utilise le code suivant pour discrétiser la matrice:

require(arules) 
#require(arulesViz) 
my_matrix= as(knime.in,"matrix"); 
my_rows= nrow(my_matrix); 
my_cols= ncol(my_matrix); 
#discretize(x, method="interval", categories = 3, labels = NULL,  
# ordered=FALSE, onlycuts=FALSE, ...) 
typeof(my_matrix) 
vector = my_matrix[,2] 
my_matrix[,2] = discretize(vector, method="interval", categories = 3, labels=c("length0","length1","length2")) 
my_matrix[,3] = ... 
etc... 

de la en correspondance ligne de code :

my_matrix[,2] = discretize(vector, method="interval", categories = 3, labels=c("length0","length1","length2")) 

Je reçois l'erreur suivante:

Erreur dans seq.default (de = min (x, na.rm = TRUE), à = max (x, na.rm = TRUE),: 'from' ne peut pas être NA, NaN ou infini

Si je mets « somme (is.na (vecteur)) ici:

vector = my_matrix[,2] 
sum(is.na(vector)) 
my_matrix[,2] = discretize(vector, method="interval", categories = 3, labels=c("length0","length1","length2")) 

-je obtenir:

> sum(is.na(vector)) 
[1] 0 

J'ai donc aucun élément NA dans le vecteur . Quoi qu'il en soit, typeof (matrix) est "character". Si j'imprime le vecteur, je reçois ce qui suit:

> vector = my_matrix[,2] 
> sum(is.na(vector)) 
[1] 0 
> head(vector, 20) 
Row0 Row1 Row2 Row3 Row4 Row5 Row6 Row7 Row8 Row9 Row10 Row11 Row12 
"128" "107" "137" " 84" " 75" "118" "121" "147" "117" "141" " 65" " 74" "168" 
Row13 Row14 Row15 Row16 Row17 Row18 Row19 
" 95" " 62" "161" " 85" " 93" " 76" " 73" 

Answer 1

Le problème est que votre vecteur est constitué de chaînes. Idéalement, vous résolvez ce problème dans le knime. Les nœuds pour ce type de conversions existent.

Cependant, vous pouvez également remplacer

vector = my_matrix[,2] 

par

vector = as.numeric(my_matrix[,2])