For loop within GeoGraphics

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I’m trying to plot a map with a list of destinations as Disks.

I first input the cities into a list such as:

destinations = {GeoPosition[New York City],
GeoPosition[Mumbai],
...}

where “New York City” is input using the Ctrl+= method to access interpreter and specify it as a city.

Then I have something summarizing to:

GeoGraphics[{
Black,
Disk[For[i=1, i<Length[destinations]+1,i++,destinations[[i]],1],
...
Disk[city,1],
},
...
]

This outputs a map with my desired projection settings such as background, range, and the single disk that I specified separately like:

Disk[city,1],

I have also tried to put the Disk function inside a for loop like:

For[i=1, i<Length[destinations]+1,i++,Disk[destinations[[i]],1]],

It’s not an incorrect indexing of the destinations list either, because

For[i=1, i<Length[destinations]+1,i++,Print[destinations[[i]]]]

outputs the correct amount of cities, whereas

For[i=0, i<Length[destinations],i++,Print[destinations[[i]]]]

outputs a first item of “List” and doesn’t print the last city.

Is it possible to use for loops within a GeoGraphics function, or would I be required to add a Disk function line for each item I would like to plot instead of iterating through a list?

Thanks in advance for the help!

share|improve this question

    up vote
    2
    down vote

    favorite

    I’m trying to plot a map with a list of destinations as Disks.

    I first input the cities into a list such as:

    destinations = {GeoPosition[New York City],
    GeoPosition[Mumbai],
    ...}
    

    where “New York City” is input using the Ctrl+= method to access interpreter and specify it as a city.

    Then I have something summarizing to:

    GeoGraphics[{
    Black,
    Disk[For[i=1, i<Length[destinations]+1,i++,destinations[[i]],1],
    ...
    Disk[city,1],
    },
    ...
    ]
    

    This outputs a map with my desired projection settings such as background, range, and the single disk that I specified separately like:

    Disk[city,1],
    

    I have also tried to put the Disk function inside a for loop like:

    For[i=1, i<Length[destinations]+1,i++,Disk[destinations[[i]],1]],
    

    It’s not an incorrect indexing of the destinations list either, because

    For[i=1, i<Length[destinations]+1,i++,Print[destinations[[i]]]]
    

    outputs the correct amount of cities, whereas

    For[i=0, i<Length[destinations],i++,Print[destinations[[i]]]]
    

    outputs a first item of “List” and doesn’t print the last city.

    Is it possible to use for loops within a GeoGraphics function, or would I be required to add a Disk function line for each item I would like to plot instead of iterating through a list?

    Thanks in advance for the help!

    share|improve this question

      up vote
      2
      down vote

      favorite

      up vote
      2
      down vote

      favorite

      I’m trying to plot a map with a list of destinations as Disks.

      I first input the cities into a list such as:

      destinations = {GeoPosition[New York City],
      GeoPosition[Mumbai],
      ...}
      

      where “New York City” is input using the Ctrl+= method to access interpreter and specify it as a city.

      Then I have something summarizing to:

      GeoGraphics[{
      Black,
      Disk[For[i=1, i<Length[destinations]+1,i++,destinations[[i]],1],
      ...
      Disk[city,1],
      },
      ...
      ]
      

      This outputs a map with my desired projection settings such as background, range, and the single disk that I specified separately like:

      Disk[city,1],
      

      I have also tried to put the Disk function inside a for loop like:

      For[i=1, i<Length[destinations]+1,i++,Disk[destinations[[i]],1]],
      

      It’s not an incorrect indexing of the destinations list either, because

      For[i=1, i<Length[destinations]+1,i++,Print[destinations[[i]]]]
      

      outputs the correct amount of cities, whereas

      For[i=0, i<Length[destinations],i++,Print[destinations[[i]]]]
      

      outputs a first item of “List” and doesn’t print the last city.

      Is it possible to use for loops within a GeoGraphics function, or would I be required to add a Disk function line for each item I would like to plot instead of iterating through a list?

      Thanks in advance for the help!

      share|improve this question

      I’m trying to plot a map with a list of destinations as Disks.

      I first input the cities into a list such as:

      destinations = {GeoPosition[New York City],
      GeoPosition[Mumbai],
      ...}
      

      where “New York City” is input using the Ctrl+= method to access interpreter and specify it as a city.

      Then I have something summarizing to:

      GeoGraphics[{
      Black,
      Disk[For[i=1, i<Length[destinations]+1,i++,destinations[[i]],1],
      ...
      Disk[city,1],
      },
      ...
      ]
      

      This outputs a map with my desired projection settings such as background, range, and the single disk that I specified separately like:

      Disk[city,1],
      

      I have also tried to put the Disk function inside a for loop like:

      For[i=1, i<Length[destinations]+1,i++,Disk[destinations[[i]],1]],
      

      It’s not an incorrect indexing of the destinations list either, because

      For[i=1, i<Length[destinations]+1,i++,Print[destinations[[i]]]]
      

      outputs the correct amount of cities, whereas

      For[i=0, i<Length[destinations],i++,Print[destinations[[i]]]]
      

      outputs a first item of “List” and doesn’t print the last city.

      Is it possible to use for loops within a GeoGraphics function, or would I be required to add a Disk function line for each item I would like to plot instead of iterating through a list?

      Thanks in advance for the help!

      list-manipulation geographics

      share|improve this question

      share|improve this question

      share|improve this question

      share|improve this question

      edited Nov 29 at 21:08

      kglr

      175k9197402

      175k9197402

      asked Nov 29 at 20:02

      Reedinationer

      415

      415

          1 Answer
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          up vote
          5
          down vote

          You don’t need For loops.

          Instead you can Map Disk on destinations; that is, use Disk /@ destionations (Disk[#, 5]& /@ destionations if you want a radius of 5 instead of the default radius 1).

          cities = {Entity["City", {"NewYork", "NewYork", "UnitedStates"}], 
              Entity["City", {"London", "GreaterLondon", "UnitedKingdom"}], 
              Entity["City", {"Bombay", "Maharashtra", "India"}], 
              Entity["City", {"Delhi", "Delhi", "India"}]};
          destinations = GeoPosition /@ cities;
          
          GeoGraphics[{Black, Disk /@ destinations}]
          

          enter image description here

          Notes: If you have to use a For loop you can do:

          disks = {}; 
          For[i = 1, i <= Length[destinations], i++, AppendTo[disks, Disk[destinations[[i]]]]];
          GeoGraphics[{Black, disks}]
          

          same picture

          Alternatively, you can use Table:

          Table[Disk[i], {i, destinations}] == disks
          

          True

          and if you have to use a For loop inside GeoGraphics

          GeoGraphics[{Black, disks = {}; 
            For[i = 1, i <= Length[destinations], i++, 
             AppendTo[disks, Disk[destinations[[i]]]]]; disks}]
          

          same picture

          share|improve this answer

          • Yes, this works perfectly thank you!
            – Reedinationer
            Nov 29 at 22:07

          Your Answer

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          1 Answer
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          1 Answer
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          active

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          up vote
          5
          down vote

          You don’t need For loops.

          Instead you can Map Disk on destinations; that is, use Disk /@ destionations (Disk[#, 5]& /@ destionations if you want a radius of 5 instead of the default radius 1).

          cities = {Entity["City", {"NewYork", "NewYork", "UnitedStates"}], 
              Entity["City", {"London", "GreaterLondon", "UnitedKingdom"}], 
              Entity["City", {"Bombay", "Maharashtra", "India"}], 
              Entity["City", {"Delhi", "Delhi", "India"}]};
          destinations = GeoPosition /@ cities;
          
          GeoGraphics[{Black, Disk /@ destinations}]
          

          enter image description here

          Notes: If you have to use a For loop you can do:

          disks = {}; 
          For[i = 1, i <= Length[destinations], i++, AppendTo[disks, Disk[destinations[[i]]]]];
          GeoGraphics[{Black, disks}]
          

          same picture

          Alternatively, you can use Table:

          Table[Disk[i], {i, destinations}] == disks
          

          True

          and if you have to use a For loop inside GeoGraphics

          GeoGraphics[{Black, disks = {}; 
            For[i = 1, i <= Length[destinations], i++, 
             AppendTo[disks, Disk[destinations[[i]]]]]; disks}]
          

          same picture

          share|improve this answer

          • Yes, this works perfectly thank you!
            – Reedinationer
            Nov 29 at 22:07

          up vote
          5
          down vote

          You don’t need For loops.

          Instead you can Map Disk on destinations; that is, use Disk /@ destionations (Disk[#, 5]& /@ destionations if you want a radius of 5 instead of the default radius 1).

          cities = {Entity["City", {"NewYork", "NewYork", "UnitedStates"}], 
              Entity["City", {"London", "GreaterLondon", "UnitedKingdom"}], 
              Entity["City", {"Bombay", "Maharashtra", "India"}], 
              Entity["City", {"Delhi", "Delhi", "India"}]};
          destinations = GeoPosition /@ cities;
          
          GeoGraphics[{Black, Disk /@ destinations}]
          

          enter image description here

          Notes: If you have to use a For loop you can do:

          disks = {}; 
          For[i = 1, i <= Length[destinations], i++, AppendTo[disks, Disk[destinations[[i]]]]];
          GeoGraphics[{Black, disks}]
          

          same picture

          Alternatively, you can use Table:

          Table[Disk[i], {i, destinations}] == disks
          

          True

          and if you have to use a For loop inside GeoGraphics

          GeoGraphics[{Black, disks = {}; 
            For[i = 1, i <= Length[destinations], i++, 
             AppendTo[disks, Disk[destinations[[i]]]]]; disks}]
          

          same picture

          share|improve this answer

          • Yes, this works perfectly thank you!
            – Reedinationer
            Nov 29 at 22:07

          up vote
          5
          down vote

          up vote
          5
          down vote

          You don’t need For loops.

          Instead you can Map Disk on destinations; that is, use Disk /@ destionations (Disk[#, 5]& /@ destionations if you want a radius of 5 instead of the default radius 1).

          cities = {Entity["City", {"NewYork", "NewYork", "UnitedStates"}], 
              Entity["City", {"London", "GreaterLondon", "UnitedKingdom"}], 
              Entity["City", {"Bombay", "Maharashtra", "India"}], 
              Entity["City", {"Delhi", "Delhi", "India"}]};
          destinations = GeoPosition /@ cities;
          
          GeoGraphics[{Black, Disk /@ destinations}]
          

          enter image description here

          Notes: If you have to use a For loop you can do:

          disks = {}; 
          For[i = 1, i <= Length[destinations], i++, AppendTo[disks, Disk[destinations[[i]]]]];
          GeoGraphics[{Black, disks}]
          

          same picture

          Alternatively, you can use Table:

          Table[Disk[i], {i, destinations}] == disks
          

          True

          and if you have to use a For loop inside GeoGraphics

          GeoGraphics[{Black, disks = {}; 
            For[i = 1, i <= Length[destinations], i++, 
             AppendTo[disks, Disk[destinations[[i]]]]]; disks}]
          

          same picture

          share|improve this answer

          You don’t need For loops.

          Instead you can Map Disk on destinations; that is, use Disk /@ destionations (Disk[#, 5]& /@ destionations if you want a radius of 5 instead of the default radius 1).

          cities = {Entity["City", {"NewYork", "NewYork", "UnitedStates"}], 
              Entity["City", {"London", "GreaterLondon", "UnitedKingdom"}], 
              Entity["City", {"Bombay", "Maharashtra", "India"}], 
              Entity["City", {"Delhi", "Delhi", "India"}]};
          destinations = GeoPosition /@ cities;
          
          GeoGraphics[{Black, Disk /@ destinations}]
          

          enter image description here

          Notes: If you have to use a For loop you can do:

          disks = {}; 
          For[i = 1, i <= Length[destinations], i++, AppendTo[disks, Disk[destinations[[i]]]]];
          GeoGraphics[{Black, disks}]
          

          same picture

          Alternatively, you can use Table:

          Table[Disk[i], {i, destinations}] == disks
          

          True

          and if you have to use a For loop inside GeoGraphics

          GeoGraphics[{Black, disks = {}; 
            For[i = 1, i <= Length[destinations], i++, 
             AppendTo[disks, Disk[destinations[[i]]]]]; disks}]
          

          same picture

          share|improve this answer

          share|improve this answer

          share|improve this answer

          edited Nov 29 at 21:05

          answered Nov 29 at 20:44

          kglr

          175k9197402

          175k9197402

          • Yes, this works perfectly thank you!
            – Reedinationer
            Nov 29 at 22:07

          • Yes, this works perfectly thank you!
            – Reedinationer
            Nov 29 at 22:07

          Yes, this works perfectly thank you!
          – Reedinationer
          Nov 29 at 22:07

          Yes, this works perfectly thank you!
          – Reedinationer
          Nov 29 at 22:07

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