我有两个列表，每个列表有2个观察结果。
我想使用map2创建一个新列表并设置一个矩阵。我目前拥有的东西如下：
library(xgboost)
dtrain <- map2(
X_list, Y_list ~ xgb.DMatrix(data = .x, label = .y, missing = "NaN")
)
如何使用map2映射X_list和Y_list并创建xgb.DMatrix？
以下一项观察结果起作用：
dtrain <- xgb.DMatrix(data = X_list[[1]], label = Y_list[[1]], missing = "NaN")
数据：
X_list <- list(structure(c(-0.5, -0.5, -0.5, -0.5, -0.5, -0.5, -0.5, -0.5,
-0.5, -0.5, -0.5, -0.5, -0.5, -0.5, -0.5, -0.5, -0.5, -0.5, -0.25,
-0.25, 0.626262626262626, 0.626262626262626, 0.626262626262626,
0.626262626262626, 0.616161616161616, 0.616161616161616, 0.616161616161616,
0.626262626262626, 0.606060606060606, 0.606060606060606, 0.616161616161616,
0.626262626262626, 0.616161616161616, 0.626262626262626, 0.646464646464647,
0.646464646464647, 0.653061224489796, 0.606060606060606, 0.595959595959596,
0.595959595959596, 0.797979797979798, 0.818181818181818, 0.797979797979798,
0.797979797979798, 0.797979797979798, 0.797979797979798, 0.797979797979798,
0.808080808080808, 0.787878787878788, 0.787878787878788, 0.797979797979798,
0.808080808080808, 0.787878787878788, 0.808080808080808, 0.818181818181818,
0.818181818181818, 0.76530612244898, 0.767676767676768, 0.757575757575758,
0.747474747474748, 0.0525742729373827, 0.0247209518021764, 0.0383024701142363,
0.0431858541848299, 0.0373874353552574, 0.043102816902322, 0.0393864266632971,
0.0453441092054323, -0.0332326842437988, -0.0673697134686685,
-0.0756843013225178, -0.0944028996710843, -0.0889603051584127,
-0.0839588622987959, -0.0693978939540514, -0.068952460676042,
-0.0623124172598907, -0.0289416799234536, -0.0263188782910003,
-0.0539180933744947, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 1, 1, 1, 1.41915800843232, 1.32400213226479, 1.24248186489683,
1.23904026693494, 1.22578149610895, 1.22560759842505, 1.23716050117333,
1.31093157484879, 1.36495946627377, 1.36987409128001, 1.32677838199057,
1.59470485996637, 1.47030836098393, 1.38716143306261, 1.41122611821048,
1.50470462559195, 2.5667628920672, 3.25998616689164, 2.72418353696655,
2.77147826857654, 2.00816529922485, 1.9712685855706, 1.93614308715926,
1.9851930297389, 1.9851930297389, 1.9851930297389, 1.9851930297389,
1.9851930297389, 1.93614308715926, 1.93678125811656, 1.93994682647747,
1.93994682647747, 1.93678125811656, 1.93994682647747, 1.98219354714358,
1.98453679538454, 2.02345566404527, 1.9393462397422, 1.92741709002804,
1.93456058692163, 0.555555555555556, 0.555555555555556, 0.555555555555556,
0.545454545454545, 0.545454545454545, 0.545454545454545, 0.545454545454545,
0.545454545454545, 0.545454545454545, 0.545454545454545, 0.535353535353535,
0.535353535353535, 0.545454545454545, 0.535353535353535, 0.525252525252525,
0.525252525252525, 0.525252525252525, 0.535353535353535, 0.505050505050505,
0.505050505050505, 0.0962206695047701, 0.0645033172611389, 0.0789706705735339,
0.0871419915715422, 0.0696361276044722, 0.0611974185989991, 0.0535584181214952,
0.0733027435074016, 0.104008467087853, 0.0643646276048721, 0.0599217594491127,
0.045252967966837, 0.0648458104086725, 0.0665422705724929, 0.0722633466679387,
0.0579149894109999, 0.0671261068882733, 0.0659758622985851, 0.0902909795091504,
0.0667567811930188), .Dim = c(20L, 9L), .Dimnames = list(NULL,
c("X1", "X2", "X3", "X4", "X5", "X6", "X7", "X8", "X9"))),
structure(c(-0.5, -0.5, -0.5, -0.5, -0.5, -0.5, -0.5, -0.5,
-0.5, -0.5, -0.5, -0.5, -0.5, -0.5, -0.5, -0.5, -0.5, -0.25,
-0.25, -0.5, 0.626262626262626, 0.626262626262626, 0.626262626262626,
0.616161616161616, 0.616161616161616, 0.616161616161616,
0.626262626262626, 0.606060606060606, 0.606060606060606,
0.616161616161616, 0.626262626262626, 0.616161616161616,
0.626262626262626, 0.646464646464647, 0.646464646464647,
0.653061224489796, 0.606060606060606, 0.595959595959596,
0.595959595959596, 0.606060606060606, 0.818181818181818,
0.797979797979798, 0.797979797979798, 0.797979797979798,
0.797979797979798, 0.797979797979798, 0.808080808080808,
0.787878787878788, 0.787878787878788, 0.797979797979798,
0.808080808080808, 0.787878787878788, 0.808080808080808,
0.818181818181818, 0.818181818181818, 0.76530612244898, 0.767676767676768,
0.757575757575758, 0.747474747474748, 0.747474747474748,
0.0247209518021764, 0.0383024701142363, 0.0431858541848299,
0.0373874353552574, 0.043102816902322, 0.0393864266632971,
0.0453441092054323, -0.0332326842437988, -0.0673697134686685,
-0.0756843013225178, -0.0944028996710843, -0.0889603051584127,
-0.0839588622987959, -0.0693978939540514, -0.068952460676042,
-0.0623124172598907, -0.0289416799234536, -0.0263188782910003,
-0.0539180933744947, -0.0784106030875784, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1.32400213226479,
1.24248186489683, 1.23904026693494, 1.22578149610895, 1.22560759842505,
1.23716050117333, 1.31093157484879, 1.36495946627377, 1.36987409128001,
1.32677838199057, 1.59470485996637, 1.47030836098393, 1.38716143306261,
1.41122611821048, 1.50470462559195, 2.5667628920672, 3.25998616689164,
2.72418353696655, 2.77147826857654, 2.8300838173709, 1.9712685855706,
1.93614308715926, 1.9851930297389, 1.9851930297389, 1.9851930297389,
1.9851930297389, 1.9851930297389, 1.93614308715926, 1.93678125811656,
1.93994682647747, 1.93994682647747, 1.93678125811656, 1.93994682647747,
1.98219354714358, 1.98453679538454, 2.02345566404527, 1.9393462397422,
1.92741709002804, 1.93456058692163, 1.9393462397422, 0.555555555555556,
0.555555555555556, 0.545454545454545, 0.545454545454545,
0.545454545454545, 0.545454545454545, 0.545454545454545,
0.545454545454545, 0.545454545454545, 0.535353535353535,
0.535353535353535, 0.545454545454545, 0.535353535353535,
0.525252525252525, 0.525252525252525, 0.525252525252525,
0.535353535353535, 0.505050505050505, 0.505050505050505,
0.535353535353535, 0.0645033172611389, 0.0789706705735339,
0.0871419915715422, 0.0696361276044722, 0.0611974185989991,
0.0535584181214952, 0.0733027435074016, 0.104008467087853,
0.0643646276048721, 0.0599217594491127, 0.045252967966837,
0.0648458104086725, 0.0665422705724929, 0.0722633466679387,
0.0579149894109999, 0.0671261068882733, 0.0659758622985851,
0.0902909795091504, 0.0667567811930188, 0.0719090569241118
), .Dim = c(20L, 9L), .Dimnames = list(NULL, c("X1", "X2",
"X3", "X4", "X5", "X6", "X7", "X8", "X9"))))
Y_list <- list(structure(c(0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0,
1, 0, 1, 1, 1), .Dim = c(20L, 1L), .Dimnames = list(NULL, "Y_plus_1")),
structure(c(1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1,
0, 1, 1, 1, 0), .Dim = c(20L, 1L), .Dimnames = list(NULL,
"Y_plus_1")))
编辑：更新的问题：
我可以创建矩阵为：
dtrain <- map2(
X_list, Y_list, ~ xgb.DMatrix(data = .x, label = .y, missing = "NaN")
)
dtest <- map(
X_list, ~ xgb.DMatrix(data = .x, missing = "NaN")
)
watchlist <- list("train" = dtrain)
params <- list("eta" = 0.1, "max_depth" = 5, "colsample_bytree" = 1, "min_child_weight" = 1, "subsample"= 1,
"objective"="binary:logistic", "gamma" = 1, "lambda" = 1, "alpha" = 0, "max_delta_step" = 0,
"colsample_bylevel" = 1, "eval_metric"= "auc",
"set.seed" = 176)
xgb.model <- map(
dtrain, ~ xgboost(params = params, data = .x, nrounds = 100, watchlist)
)
以上所有作品。我的问题是预测功能：
xgb.pred <- map(
dtest, ~ predict(xgb.model, data = .x, type = 'prob')
)
我收到此错误：
ets中的错误（对象，lambda = lambda，biasadj = biasadj， allow.multiplicative.trend = allow.multiplicative.trend，：y 应该是单变量时间序列
我现在有一个大列表xgb.model和一个普通列表dtest以及一个函数predict。
这也失败了：
xgb.pred <- map2(
dtest, xgb.model, ~ predict(object = .x, model = .y, type = 'prob')
)
错误：
Forecast.ts（object，...）中的错误：未知模型类
（如果需要，我可以提供更多数据）
答案 0 :(得分：3)
尝试一下
return Scaffold(
body: CustomScrollView(
slivers: [
SliverAppBar(...),
SliverList(delegate: SliverChildListDelegate(
List.generate(yourList.length, (idx) {
return Padding(
padding: const EdgeInsets.only(left: 8.0, right: 8.0),
child: Card(
child: ListTile(
leading: Icon(null),
title: Text(yourList[idx]),
onTap: null,
),
),
);
})
))
],
),
);