I have created this code sample to pass an object of type c# DataTable to R.Net dataFrame.
echo base_url('img.jpg');
Everything seems to work fine untill i try to inspect the content of the dataframe. I found that values like public static DataFrame ConvertDataTableToRDataFrame(DataTable tab)
{
REngine.SetEnvironmentVariables();
REngine engine = REngine.GetInstance();
double?[,] stringData = new double?[tab.Rows.Count, tab.Columns.Count];
DataFrame df = engine.Evaluate("df=NULL").AsDataFrame();
int irow = 0;
foreach (DataRow row in tab.Rows)
{
NumericVector x = engine.Evaluate("x=NULL").AsNumeric();
int icol = 0;
foreach (DataColumn col in tab.Columns)
{
if (row.Field<double?>(col) == null)
{
x = engine.Evaluate("x=c(x, NA) ").AsNumeric();
}
else { x = engine.Evaluate("x=c(x, " + row.Field<double?>(col) + ") ").AsNumeric(); }
icol++;
}
df = engine.Evaluate("df= as.data.frame(rbind(df,x)) ").AsDataFrame();
irow++;
}
return (df);
}
turn in the dataframe to 1.2355. For some unknown reason it doesn't recognize 12355 as decimal separator.
答案 0 :(得分：1)
- 添加@Panagiotis Kanavos命题作为答案，因为它解决了问题 -
小数没有任何特定的小数分隔符，它们是二进制值。仅当分隔符转换为字符串时才使用分隔符。根据定义，Role.first=> #<Role id: 1, name: "admin", admin_user_id: 1, resource_id: nil, resource_type: nil, created_at: "2016-06-16 15:03:33", updated_at: "2016-06-17 09:29:32">
Role.first.admin_users => []
的输出将是row.Field<double?>(col)，但是将其连接到字符串会使用当前用户的文化将其转换为字符串。
改为使用Nullable<double>或String.Format(CultureInfo.InvariantCulture,"x=c(x, {0})" ,row.Field<double?>(col)) -