how to create wind direction categoricals

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Douglas Leaffer 2023-3-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1927490-how-to-create-wind-direction-categoricals

评论： Walter Roberson 2023-3-13

Hello. I m trying to create categoricals from wind directions (0 - 359 degrees) for 4 values: 1 = airport; 2 = bus_sta; 3= road; 4 = other

The compass degree ranges, resectively, are below, in a for loop, which did not work. I want to store the vlues in a vector of length specifed:

for i = 1:length(T1.classification)
    if (45<=RMET2.Deg)&(RMET2.Deg<=65)
        impact = impact(i);
    elseif (260<=RMET2.Deg)&(RMET2.Deg<=280)
        impact = impact(i);
    elseif (80<=RMET2.Deg)&(RMET2.Deg<=100)
        impact = impact(i);
    else impact = impact;
    end
end

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Douglas Leaffer 2023-3-13

I tried this approach too

Douglas Leaffer 2023-3-13

Deg.mat

here is the vector file in a column

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采纳的回答

Walter Roberson 2023-3-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1927490-how-to-create-wind-direction-categoricals#answer_1191550

在 MATLAB Online 中打开

RMET2.Deg = (0:15:360).';
dirs = discretize(RMET2.Deg, [0 45 65 80 100 260 280 360], {'other', 'airport', 'other', 'bus_sta', 'other', 'road', 'other'});
disp(table(RMET2.Deg, dirs))
    Var1       Var2    
    ____    ___________

   {'other'  }
   {'other'  }
   {'other'  }
   {'airport'}
   {'airport'}
   {'other'  }
   {'bus_sta'}
   {'other'  }
   {'other'  }
   {'other'  }
   {'other'  }
   {'other'  }
   {'other'  }
   {'other'  }
   {'other'  }
   {'other'  }
   {'other'  }
   {'other'  }
   {'road'   }
   {'other'  }
   {'other'  }
   {'other'  }
   {'other'  }
   {'other'  }
   {'other'  }

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Douglas Leaffer 2023-3-13

在 MATLAB Online 中打开

This worked for me:

catnames = ["other", "airport", "other", "bus_sta", "other", "road", "other"];
ImpactWind = discretize(RMET2.Deg,[0 45 65 80 100 260 280 360],'categorical',catnames);