Hi ,
I am trying to create a dataframe in C and sebd it back to R. Can anyone
point me to the part of the source code where it is doing , let me explain
the problem I am having .
--------------------------------------------------------------------
My simple implementation is like this
SEXP formDF() {
SEXP dfm ,df , dfint , dfStr,lsnm;
char *ab[3] = {"aa","vv","gy"};
int sn[3] ={99,89,12};
char *listnames[2] = {"int","string"};
int i;
PROTECT(df = allocVector(VECSXP,2));
PROTECT(dfint = allocVector(INTSXP,3));
PROTECT(dfStr = allocVector(STRSXP,3));
PROTECT(lsnm = allocVector(STRSXP,2));
SET_STRING_ELT(lsnm,0,mkChar("int"));
SET_STRING_ELT(lsnm,1,mkChar("string"));
for ( i = 0 ; i < 3; i++ ) {
SET_STRING_ELT(dfStr,i,mkChar(ab[i]));
INTEGER(dfint)[i] = sn[i];
}
SET_VECTOR_ELT(df,0,dfint);
SET_VECTOR_ELT(df,1,dfStr);
setAttrib(df,R_NamesSymbol,lsnm);
//PROTECT(dfm=LCONS(dfm,list3(dfm,R_MissingArg,mkFalse())));
UNPROTECT(4);
dfm = PROTECT(lang2(install("data.frame"),df));
SEXP res = PROTECT(eval(dfm,R_GlobalEnv));
UNPROTECT(2)
}
------------------------------------------------------------------------
It works fine but i want it the other way
the output is
print(result)
int string
1 99 aa
2 89 vv
3 12 gy
I want it in transposed . like
dft <- as.data.frame(t(result))
*Can I do the transpose it from C itself ? Which part of code I should look
a*t .
What My objective ?
*Reading rows of a table and create a dataframe out of it . R is embedded
in database so cannot call the odbc . Need to implement that part .
Database gives me API only to get a whole row at once .*
Thanks,
Sandip
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