Question

class "ecdf"继承自“stepfun”类。如果f是经验累积密度函数， is.stepfun(f)和is(f,"stepfun")都是TRUE，而as.stepfun(f)没有按预期执行任何操作。但由于“元数据”，即使f为as(f,"stepfun")，strict转换为FALSE也不可能f <- ecdf(1:10) class(f) # [1] "ecdf" "stepfun" "function" is.stepfun(f) # [1] TRUE is(f,"stepfun") # [1] TRUE identical(f,as.stepfun(f)) # [1] TRUE g <- as(f,"stepfun",strict=FALSE) # Error in as(f, "stepfun", strict = FALSE) : # internal problem in as(): “ecdf” is(object, "stepfun") is TRUE, but the metadata asserts that the 'is' relation is FALSE：

is

那么as与numpy的关系如何？“元数据”的含义是什么？

Answer 1

我可能已经找到了一些相关信息。在this nabble archive

npm sill fetchPackageMetaData Error: This request requires auth credentials. Run `npm login` and repeat the request.
npm sill fetchPackageMetaData     at CachingRegistryClient.authify (<root>\ui\target\node\node_modules\npm\node_modules\npm-registry-client\lib\authify.js:17:14)
npm sill fetchPackageMetaData     at CachingRegistryClient.makeRequest (<root>\ui\target\node\node_modules\npm\node_modules\npm-registry-client\lib\request.js:103:17)
npm sill fetchPackageMetaData     at <root>\ui\target\node\node_modules\npm\node_modules\npm-registry-client\lib\request.js:66:17
npm sill fetchPackageMetaData     at RetryOperation._fn (<root>\ui\target\node\node_modules\npm\node_modules\npm-registry-client\lib\attempt.js:18:5)
npm sill fetchPackageMetaData     at null._onTimeout (<root>\ui\target\node\node_modules\npm\node_modules\retry\lib\retry_operation.js:49:10)
npm sill fetchPackageMetaData     at Timer.listOnTimeout (timers.js:92:15)
npm sill fetchPackageMetaData  error for fsevents@^1.0.0 [Error: This request requires auth credentials. Run `npm login` and repeat the request.]
npm WARN install Couldn't install optional dependency: This request requires auth credentials. Run `npm login` and repeat the request.
npm verb install Error: This request requires auth credentials. Run `npm login` and repeat the request.
npm verb install     at CachingRegistryClient.authify (<root>\ui\target\node\node_modules\npm\node_modules\npm-registry-client\lib\authify.js:17:14)
npm verb install     at CachingRegistryClient.makeRequest (<root>\ui\target\node\node_modules\npm\node_modules\npm-registry-client\lib\request.js:103:17)
npm verb install     at <root>\ui\target\node\node_modules\npm\node_modules\npm-registry-client\lib\request.js:66:17
npm verb install     at RetryOperation._fn (<root>\ui\target\node\node_modules\npm\node_modules\npm-registry-client\lib\attempt.js:18:5)
npm verb install     at null._onTimeout (<root>\ui\target\node\node_modules\npm\node_modules\retry\lib\retry_operation.js:49:10)
npm verb install     at Timer.listOnTimeout (timers.js:92:15)

本地:-) this SO question有关于尝试使用but it has two problems: 1) as() is an S4 method that does not always work (problem 2 not relevant)

的警告

所以我的建议是坚持as()。

R：为什么“是”是真的，但“as”是不可能的？

1 个答案: