ibm - Standard cov() function in R not working in DSX -


the standard covariance function in r cov() not working in dsx.

i ran following code on states.x77 dataset:

    cov(states)

i got following error message:

    error in (function (classes, fdef, mtable) : unable find      inherited method function ‘cov’ signature ‘"matrix"’     traceback:     1. cov(states)     2. (function (classes, fdef, mtable)      . {     . methods <- .findinheritedmethods(classes, fdef, mtable)     . if (length(methods) == 1l)      . return(methods[[1l]])     . else if (length(methods) == 0l) {     . cnames <- paste0("\"", vapply(classes, as.character,      . ""), "\"", collapse = ", ")     . stop(gettextf("unable find inherited method function %s      signature %s",      . squote(fdef@generic), squote(cnames)), domain = na)     . }     . else stop("internal error in finding inherited methods; didn't      return unique method",      . domain = na)     . })(list("matrix"), structure(function (x, ...)      . {     . standardgeneric("cov")     . }, generic = structure("cov", package = "sparkr"), package =      "sparkr", group = list(), valueclass = character(0), signature =      "x", default = `\001null\001`, skeleton = (function (x,      . ...)      . stop("invalid call in method dispatch 'cov' (no default      method)",      . domain = na))(x, ...), class =      structure("nonstandardgenericfunction", package = "methods")),      . <environment>)     3. stop(gettextf("unable find inherited method function      %s signature %s",      . squote(fdef@generic), squote(cnames)), domain = na)

i not sure doing wrong. turns out, stats::cov() overwritten sparkr::cov(). once replaced code with:

    stats::cov()

the function returned desired result.

thanks, venky

cov() in r comes stats package. in r, order of importing libraries important , overwrite each others functions. seems case here. can call overwritten functions other packages specifying package name, as:

stats::cov(<dataset>)

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