Hfrhyu

Should man-made satellites feature an intelligent inverted "cow catcher"?

Flight departed from the gate 5 min before scheduled departure time. Refund options

Restricting the Object Type for the get method in java HashMap

Is there a spell that can create a permanent fire?

IC on Digikey is 5x more expensive than board containing same IC on Alibaba: How?

Why are two-digit numbers in Jonathan Swift's "Gulliver's Travels" (1726) written in "German style"?

Centre cell vertically in tabularx across multiple multiline rows

Why is there so little support for joining EFTA in the British parliament?

Is the Mordenkainen's Sword spell underpowered?

Marquee sign letters

How do I say "this must not happen"?

Which types of prepositional phrase is "toward its employees" in Philosophy guiding the organization's policies towards its employees is not bad?

Why did Bronn offer to be Tyrion Lannister's champion in trial by combat?

Bash script to execute command with file from directory and condition

Why are current probes so expensive?

How to remove this numerical artifact?

.bashrc alias for a command with fixed second parameter

How can I list files in reverse time order by a command and pass them as arguments to another command?

Is there a verb for listening stealthily?

Magento 2 - Add additional attributes in register

My mentor says to set image to Fine instead of RAW — how is this different from JPG?

Changing order of draw operation in PGFPlots

What should one know about term logic before studying propositional and predicate logic?

why doesn't university give past final exams' answers

QGIS 3.6: variable functions, confusing explanation

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

1

The documentation (https://docs.qgis.org/3.4/en/docs/user_manual/working_with_vector/expression.html#id31) says:

To use these functions in an expression, they should be preceded by @ character (e.g, @row_number).

map_scale is one of these variables. But if you see the example map_get( item_variables('Map 0'), 'map_scale')it is used without an @

Why is it in this case used without an @?

qgis-3 function qgis-variable

share|improve this question

edited Apr 13 at 11:52

PieterB

asked Apr 13 at 11:39

PieterBPieterB

3,1801128

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  in this case it is necessary to read the syntax of the map_get function (map_get (map, key)): in this case map_scale represents the key
  
  – pigreco
  Apr 13 at 11:47
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @pigreco, it's a little bit confusing. Is there some documentation that describes the difference, when using it with or without?
  
  – PieterB
  Apr 13 at 11:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  to my knowledge there is no detailed documentation on these topics
  
  – pigreco
  Apr 13 at 15:04
  

  
  
  
  

add a comment | 

1

The documentation (https://docs.qgis.org/3.4/en/docs/user_manual/working_with_vector/expression.html#id31) says:

To use these functions in an expression, they should be preceded by @ character (e.g, @row_number).

map_scale is one of these variables. But if you see the example map_get( item_variables('Map 0'), 'map_scale')it is used without an @

Why is it in this case used without an @?

qgis-3 function qgis-variable

share|improve this question

edited Apr 13 at 11:52

PieterB

asked Apr 13 at 11:39

PieterBPieterB

3,1801128

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  in this case it is necessary to read the syntax of the map_get function (map_get (map, key)): in this case map_scale represents the key
  
  – pigreco
  Apr 13 at 11:47
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @pigreco, it's a little bit confusing. Is there some documentation that describes the difference, when using it with or without?
  
  – PieterB
  Apr 13 at 11:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  to my knowledge there is no detailed documentation on these topics
  
  – pigreco
  Apr 13 at 15:04
  

  
  
  
  

add a comment | 

The documentation (https://docs.qgis.org/3.4/en/docs/user_manual/working_with_vector/expression.html#id31) says:

To use these functions in an expression, they should be preceded by @ character (e.g, @row_number).

map_scale is one of these variables. But if you see the example map_get( item_variables('Map 0'), 'map_scale')it is used without an @

Why is it in this case used without an @?

qgis-3 function qgis-variable

share|improve this question

edited Apr 13 at 11:52

PieterB

asked Apr 13 at 11:39

PieterBPieterB

3,1801128

share|improve this question

edited Apr 13 at 11:52

PieterB

asked Apr 13 at 11:39

PieterBPieterB

3,1801128

share|improve this question

edited Apr 13 at 11:52

PieterB

asked Apr 13 at 11:39

PieterBPieterB

3,1801128

asked Apr 13 at 11:39

PieterBPieterB

3,1801128

asked Apr 13 at 11:39

PieterBPieterB

3,1801128