search for: dims2

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2008 Apr 05
2
Adding a Matrix Exponentiation Operator
...rixData(SEXP a, SEXP b, int nrows, int ncols, int mode) { for (int i=0; i < ncols; ++i) for (int j=0; j < nrows; ++j) REAL(b)[i * nrows + j] = REAL(a)[i * nrows + j]; } SEXP do_matexp(SEXP call, SEXP op, SEXP args, SEXP rho) { int nrows, ncols; SEXP matrix, tmp, dims, dims2; SEXP x, y, x_, x__; int i,j,e,mode; // Still need to fix full complex support mode = isComplex(CAR(args)) ? CPLXSXP : REALSXP; SETCAR(args, coerceVector(CAR(args), mode)); x = CAR(args); y = CADR(args); dims = getAttrib(x, R_DimSymbol); nrows = INTEGER(dims)[...
2008 Jul 11
1
Subsetting an array by a vector of dimensions
...y by a vector of n dimensions? E.g. assume I have > x <- array(1:24, dim=2:4) > x[1,1,2] [1] 7 > dims <- c(1,1,2) I would like a function that I can supply x and dims as parameters to, and have it return 7. Also, I would like to do something like: > x[1,1,] [1] 1 7 13 19 > dims2<- c(1,1,NA) And have a function of x and dims2 that gives me back [1] 1 7 13 19 Does such a thing exist? Thanks Richard -- Richard D. Pearson richard.pearson at postgrad.manchester.ac.uk School of Computer Science, http://www.cs.man.ac.uk/~pearsonr University of Mancheste...