Hi,
I have been studying the R manual on lists but cannot seem to create a
simple R list in C - I keep on getting "'dimnames' applied to non-array"
whenever I attempt to assign names to the list elements:
Wanted output a list structure something like
[ type="Bid", price=2.0, volume=1000 ]
I can get up to a list of
[ "Bid2, 2.0, 1000 ]
But for the life of me I can't assign the names to the list items - any
suggestions?
Below is what I already have - any comments on things I don't really need
to do as well in terms of creating extra string objects etc are also
helpful.
Many thanks
Tom
======EXTRACT=========
SEXP typeStr, volumeStr, priceStr, typeValStr;
SEXP priceList;
// create main list of vectors (unspecific items )
PROTECT( priceList = allocVector( VECSXP, 3 ) );
// for each item create a label and attach value
PROTECT( typeValStr = allocVector( STRSXP, 1 ) );
SET_STRING_ELT( typeValStr, 0,
mkChar( getPriceDataTypeAsString( p.getData().getType() ).c_str() ) );
SET_STRING_ELT( priceList, 0, typeValStr) ;
SEXP priceSXP;
PROTECT( priceSXP = allocVector( REALSXP, 1) );
REAL(priceSXP)[0] = p.getData().getPrice();
SET_VECTOR_ELT( priceList, 1, priceSXP);
SEXP volumeSXP;
PROTECT( volumeSXP = allocVector( REALSXP, 1 ) );
REAL(volumeSXP)[0] = p.getData().getVolume();
SET_VECTOR_ELT( priceList, 2, volumeSXP);
********WORKS UP TO HERE*************
// add the names of the list items (type,price,volume)
SEXP dimnames;
PROTECT( dimnames = allocVector( VECSXP, 3 ) );
// first create string objects
PROTECT( typeStr = allocVector( STRSXP,1 ) );
SET_STRING_ELT( typeStr, 0, mkChar("type") );
PROTECT( priceStr = allocVector( STRSXP,1 ) );
SET_STRING_ELT( priceStr, 0, mkChar("price") );
PROTECT( volumeStr = allocVector( STRSXP,1 ) );
SET_STRING_ELT( volumeStr, 0, mkChar("volume") );
// assign string objects to vector
SET_VECTOR_ELT( dimnames, 0, typeStr );
SET_VECTOR_ELT( dimnames, 1, priceStr);
SET_VECTOR_ELT( dimnames, 2, volumeStr );
// assign vector to original list of data
setAttrib( priceList, R_DimNamesSymbol, dimnames ); <----- I think this
is wrong but I don;t know what it should be
===========END EXTRACT===============
--
Dr. Thomas McCallum
Systems Architect,
Level E Limited
ETTC, The King's Buildings
Mayfield Road,
Edinburgh EH9 3JL, UK
Work +44 (0) 131 472 4813
Fax: +44 (0) 131 472 4719
http://www.levelelimited.com
Email: [EMAIL PROTECTED]
Level E is a limited company incorporated in Scotland. The c...{{dropped}}
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