What Does "Error: Object '<Myvariable>' Not Found" Mean

How to fix Object not found error in R

I believe Alex's answer above is correct. The plot() function is complaining that X is not a variable, and you've already said it was a column instead. The "data" parameter tells plot not to try and interpret X and Y as variables, but as columns of a dataframe.

It would also work to use

plot(<name_of_dataframe>$X ~ <name_of_dataframe>$Y)

Where you replace <name_of_dataframe> with the actual name of the object that you imported the .csv into.

Error message - why does it say object not found?

I haven't referred the book so I may be loosing some context here but based on your explanation and description I think there are few possibilities here.

1. Book is wrong and this is some kind of mistake.

mean is an internal command. You can look at the documentation (?mean) and notice there is no data argument defined in mean.

To get mean you can use -

mean(cherryBlossom2008$age, na.rm = TRUE)

2. You are supposed to use mean command present in some other library and not base.

3. You have to define your own mean function and not use the internal one.

mean <- function(col, data) {
  base::mean(data[[deparse(substitute(col))]], na.rm = TRUE)
}

In which case - mean(age, data=cherryBlossom2008) will work.

For eg - with mtcars dataset -

mean(mpg, data = mtcars)
#[1] 20.09062

However, this option is very unlikely.

Using vectors in r

Initialize z with z <- c() before for loop.

Flutter error: A value of type 'Object?' can't be assigned to a variable of type 'String'

Assign the generic type String to the DropdownButtonFormField:

DropdownButtonFormField<String>(
                    value: _currentSugars,
                    decoration: textInputDecoration,
                    items: sugars.map((sugar) {
                      return DropdownMenuItem(
                        value: sugar,
                        child: Text('$sugar sugars'),
                      );
                    }).toList(),
                    onChanged: (val) => setState(() => _currentSugars = val), 
                  ),

Unless you specify the type String dart makes the assumption with the one of the most generic types it has Object? as the generic type of the DropdownButtonFormField

Complete demo (Updated to use null safety)

class Demo extends StatefulWidget {
  Demo({Key? key}) : super(key: key);

  @override
  _DemoState createState() => _DemoState();
}

class _DemoState extends State<Demo> {
  final sugars = ['candy', 'chocolate', 'snicker'];
  String? _currentSugars = 'candy';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: DropdownButtonFormField<String>(
          value: _currentSugars,
          items: sugars.map((sugar) {
            return DropdownMenuItem(
              value: sugar,
              child: Text('$sugar sugars'),
            );
          }).toList(),
          onChanged: (val) => setState(() => _currentSugars = val),
        ),
      ),
    );
  }
}

What do I do to correct Error in `filter()` and then 'object not found'?

Try this

data <- testvdemset %>% 
  filter(country_name %in% c('Argentina','Bolivia','Ecuador','Guatemala','Haiti','Honduras',
                         'Panama','Paraguay','Peru','Venezuela'))

Export default was not found

You have to specify default explicitly:

export default function translateDate(date) {
   ..
}

Angular: Cannot find a differ supporting object '[object Object]'

I think that the object you received in your response payload isn't an array. Perhaps the array you want to iterate is contained into an attribute. You should check the structure of the received data...

You could try something like that:

getusers() {
  this.http.get(`https://api.github.com/search/users?q=${this.input1.value}`)
    .map(response => response.json().items) // <------
    .subscribe(
      data => this.users = data,
      error => console.log(error)
    );
}

Edit

Following the Github doc (developer.github.com/v3/search/#search-users), the format of the response is:

{
  "total_count": 12,
  "incomplete_results": false,
  "items": [
    {
      "login": "mojombo",
      "id": 1,
      (...)
      "type": "User",
      "score": 105.47857
    }
  ]
}

So the list of users is contained into the items field and you should use this:

getusers() {
  this.http.get(`https://api.github.com/search/users?q=${this.input1.value}`)
    .map(response => response.json().items) // <------
    .subscribe(
      data => this.users = data,
      error => console.log(error)
    );
}

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