> Hi Y'all,
>
> I am using the text mining package (tm). I am trying to filter out all of the
> words in a Term Document Matrix that are not in a list of words that I am
> interested in. I am using the following code:
>
> z<-tm_intersect(txt.dtm, c("communications", "safety", "climate", "blood",
> "surface", "cleanliness", "amenities", "monitoring", "staff", "competency",
> "policy", "procedure", "inconsistency", "physician", "orders", "treatment",
> "times", "care", "plan", "strategies", "concerns", "meetings", "equipment",
> "treatment", "options", "delivery", "care", "discharge", "welfare",
> "violations", "HIPPS", "professionalism", "lack", "boundaries crossing",
> "transportation", "benefits", "assistance", "beneficiary", "complaint",
> "grievance", "inquiry", "formal", "data", "processing", "concern",
> "facility", "abuse", "data", "request", "disruptive", "information",
> "patient", "discharge", "transfer", "physical", "ethics", "resolution",
> "professional","reimbursement", "financial", "request", "status",
> "educational", "material", "forms", "technical", "assistance", "staff",
> "related", "quality",
> "care","disruptive","behavior","special","needs","mental","illness","noncompliance","illegal",
> "immigra!
nt", "abusive", "violent","litigation", "prisoner", "corporate", "lockout",
"disposition", "discharge", "reason"))
>
> I get the following error:
>
> "no applicable method for 'tm_intersect' applied to an object of class
> "c('TermDocumentMatrix', 'simple_triplet_matrix')" "
>
> What am I doing wrong? I'd greatly appreciate any ideas or thoughts on
> this!!!! Thank you!!
You can directly subset the matrix, e.g.:
library(tm)
data(crude)
m <- TermDocumentMatrix(crude)
z <- m[c("oil", "zone"),]
inspect(z)
Ensure that you only try to subset for terms occurring in the matrix
as otherwise it will not work. You can get all terms via Terms(m).
Best regards,
Ingo Feinerer
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