Running examples in ‘flacco-Ex.R’ failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: FeatureObject
> ### Title: Create a Feature Object
> ### Aliases: FeatureObject createFeatureObject
> 
> ### ** Examples
> 
> # (1a) create a feature object using X and y:
> X = createInitialSample(n.obs = 500, dim = 3,
+   control = list(init_sample.lower = -10, init_sample.upper = 10))
> y = apply(X, 1, function(x) sum(x^2))
> feat.object1 = createFeatureObject(X = X, y = y, 
+   lower = -10, upper = 10, blocks = c(5, 10, 4))
> 
> # (1b) create a feature object using X and fun:
> feat.object2 = createFeatureObject(X = X, 
+   fun = function(x) sum(sin(x) * x^2),
+   lower = -10, upper = 10, blocks = c(5, 10, 4))
> 
> # (1c) create a feature object using a data.frame:
> feat.object3 = createFeatureObject(iris[,-5], blocks = 5, 
+   objective = "Petal.Length")
> 
> # (2) have a look at the feature objects:
> feat.object1
Feature Object:
- Number of Observations: 500
- Number of Variables: 3
- Lower Boundaries: -1.00e+01, -1.00e+01, -1.00e+01
- Upper Boundaries: 1.00e+01, 1.00e+01, 1.00e+01
- Name of Variables: x1, x2, x3
- Optimization Problem: minimize y
- Number of Cells per Dimension: 5, 10, 4
- Size of Cells per Dimension: 4.00, 2.00, 5.00
- Number of Cells:
  - total: 200
  - non-empty: 182 (91.00%)
  - empty: 18 (9.00%)
- Average Number of Observations per Cell:
  - total: 2.50
  - non-empty: 2.75
> feat.object2
Feature Object:
- Number of Observations: 500
- Number of Variables: 3
- Lower Boundaries: -1.00e+01, -1.00e+01, -1.00e+01
- Upper Boundaries: 1.00e+01, 1.00e+01, 1.00e+01
- Name of Variables: x1, x2, x3
- Optimization Problem: minimize y
- Function to be Optimized: function (x) sum(sin(x) * x^2)
- Number of Cells per Dimension: 5, 10, 4
- Size of Cells per Dimension: 4.00, 2.00, 5.00
- Number of Cells:
  - total: 200
  - non-empty: 182 (91.00%)
  - empty: 18 (9.00%)
- Average Number of Observations per Cell:
  - total: 2.50
  - non-empty: 2.75
> feat.object3
Feature Object:
- Number of Observations: 150
- Number of Variables: 3
- Lower Boundaries: 4.30e+00, 2.00e+00, 1.00e-01
- Upper Boundaries: 7.90e+00, 4.40e+00, 2.50e+00
- Name of Variables: Sepal.Length, Sepal.Width, Petal.Width
- Optimization Problem: minimize Petal.Length
- Number of Cells per Dimension: 5, 5, 5
- Size of Cells per Dimension: 0.72, 0.48, 0.48
- Number of Cells:
  - total: 125
  - non-empty: 37 (29.60%)
  - empty: 88 (70.40%)
- Average Number of Observations per Cell:
  - total: 1.20
  - non-empty: 4.05
> 
> # (3) now, one could calculate features
> calculateFeatureSet(feat.object1, "ela_meta")
$ela_meta.lin_simple.adj_r2
[1] 0.007611856

$ela_meta.lin_simple.intercept
[1] 100.4512

$ela_meta.lin_simple.coef.min
[1] 0.1066988

$ela_meta.lin_simple.coef.max
[1] 0.8837961

$ela_meta.lin_simple.coef.max_by_min
[1] 8.283094

$ela_meta.lin_w_interact.adj_r2
[1] 0.03712366

$ela_meta.quad_simple.adj_r2
[1] 1

$ela_meta.quad_simple.cond
[1] 1

$ela_meta.quad_w_interact.adj_r2
[1] 1

$ela_meta.costs_fun_evals
[1] 0

$ela_meta.costs_runtime
[1] 0.015

> calculateFeatureSet(feat.object2, "cm_grad")
$cm_grad.mean
[1] 0.6478578

$cm_grad.sd
[1] 0.1799982

$cm_grad.costs_fun_evals
[1] 0

$cm_grad.costs_runtime
[1] 0.127

> library(plyr)
Error in library(plyr) : there is no package called ‘plyr’
Execution halted