Select best time in an array

Question

Franco Mazzaro 2022-6-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1736805-select-best-time-in-an-array

回答： Peter Perkins 2022-6-13

Hi everyone! So i have this function that creates a .tx with drivers and their respective lap times:

function txtcreator_v2(drivers_scuderias,file)
%TXTCREATOR asigna un tiempo de vuelta a cada conductor y escribe los
%resultados en un archivo .txt.
%driversscuderias debe ser un string array
%file es el nombre del archivo que queremos crear
minutes = randi(2,1,100); seconds = randi(59,1,100); milliseconds=randi(999,1,100);
%generador de tiempo
fid = fopen(file,'w+');
for i=1:length(minutes)
    
    fangio = randi(20,1,1);
    fprintf(fid,'%s;%s;%d:%02d.%03d\n',drivers_scuderias(fangio,1),drivers_scuderias(fangio,2),minutes(i),seconds(i),milliseconds(i));
    
end
fclose(fid);
end

and then a script that reads the text file and structures it:

driv_scu= ["LEC" "SAI" "BOT" "ZHO" "ALB" "LAT" "VER" "PER" "HAM" ... 
    "RUS" "NOR" "RIC" "MSC" "MAG" "STR" "VET" "GAS" "TSU" "ALO" "OCO";"ferrari" "ferrari" "alfa romeo" "alfa romeo" "williams" "williams" "red bull" "red bull" "mercedes" "mercedes"...
    "mclaren" "mclaren" "haas" "haas" "aston martin" "aston martin" "alpha tauri" "alpha tauri" "alpine" "alpine"]';
txtcreator_v2(driv_scu,'laptimes.txt')
fid = fopen("laptimes.txt");
parrilla = textscan(fid,'%s %s %s','delimiter',';');
fclose(fid);
domenicalli=vertcat( parrilla{1} );
senna=vertcat( parrilla{2} );
prost=vertcat( parrilla{3} );
ayrton= [domenicalli senna prost];

The thing is, i want ayrton to only have the best lap times of each pilot. I mean deleting the repeated names based on their lap times (if hamilton is repited two times, i only keep the "hamilton" with the best lap)

Any clues?

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Answer 1

Peter Perkins 2022-6-13

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1736805-select-best-time-in-an-array#answer_984610

在 MATLAB Online 中打开

You are making your life more difficult using fopen etc. Use writetable and readtable:

>> laptimes = readtable("laptimes.txt","ReadVariableNames",false);
>> laptimes.Properties.VariableNames = ["Driver" "Team" "Time"];
>> laptimes.Time = duration(laptimes.Time,"Format","mm:ss.SSS")
laptimes =
  100×3 table
    Driver           Team            Time   
    _______    ________________    _________
    {'SAI'}    {'ferrari'     }    01:44.985
    {'GAS'}    {'alpha tauri' }    02:53.559
    {'NOR'}    {'mclaren'     }    01:15.933
    {'MAG'}    {'haas'        }    01:08.720
    {'ALB'}    {'williams'    }    01:14.484
    {'NOR'}    {'mclaren'     }    02:21.639
    {'STR'}    {'aston martin'}    02:17.887
    {'OCO'}    {'alpine'      }    02:55.199
    {'HAM'}    {'mercedes'    }    02:04.395
    {'SAI'}    {'ferrari'     }    01:35.992
    {'SAI'}    {'ferrari'     }    02:10.402
    {'MSC'}    {'haas'        }    01:50.659
    {'VET'}    {'aston martin'}    02:10.901
    {'MAG'}    {'haas'        }    02:30.995
    {'VER'}    {'red bull'    }    02:59.653
    {'ALO'}    {'alpine'      }    01:21.109
    {'NOR'}    {'mclaren'     }    01:03.037
    {'OCO'}    {'alpine'      }    02:13.618
    {'SAI'}    {'ferrari'     }    02:24.567
    {'ALB'}    {'williams'    }    02:20.962
       :              :                :    
    {'VER'}    {'red bull'    }    02:37.751
    {'GAS'}    {'alpha tauri' }    02:16.368
    {'ALB'}    {'williams'    }    01:27.941
    {'RIC'}    {'mclaren'     }    02:50.018
    {'ALO'}    {'alpine'      }    02:12.829
    {'LEC'}    {'ferrari'     }    02:18.626
    {'SAI'}    {'ferrari'     }    02:29.539
    {'LEC'}    {'ferrari'     }    01:20.650
    {'MAG'}    {'haas'        }    02:48.726
    {'RIC'}    {'mclaren'     }    01:59.095
    {'BOT'}    {'alfa romeo'  }    02:10.877
    {'VET'}    {'aston martin'}    02:14.015
    {'MSC'}    {'haas'        }    02:42.295
    {'SAI'}    {'ferrari'     }    01:23.180
    {'SAI'}    {'ferrari'     }    02:58.926
    {'BOT'}    {'alfa romeo'  }    01:58.069
    {'VET'}    {'aston martin'}    01:38.581
    {'SAI'}    {'ferrari'     }    02:51.637
    {'ALB'}    {'williams'    }    02:24.651
    {'ALB'}    {'williams'    }    01:38.864
	Display all 100 rows.

If the file had been written with column headings, that code would have been even shorter.

At that point, what you want is a one-liner:

>> besttimes = varfun(@min,laptimes,"GroupingVariables","Driver","InputVariables","Time")
besttimes =
  20×3 table
    Driver     GroupCount    min_Time 
    _______    __________    _________
    {'ALB'}        6         01:14.484
    {'ALO'}        7         01:21.109
    {'BOT'}        7         01:15.051
    {'GAS'}        7         01:56.890
    {'HAM'}        3         01:35.276
    {'LAT'}        6         01:18.880
    {'LEC'}        5         01:20.650
    {'MAG'}        8         01:08.720
    {'MSC'}        3         01:31.334
    {'NOR'}        5         01:03.037
    {'OCO'}        4         01:57.805
    {'PER'}        1         02:34.701
    {'RIC'}        6         01:34.114
    {'RUS'}        3         01:30.452
    {'SAI'}        9         01:23.180
    {'STR'}        3         02:17.887
    {'TSU'}        2         01:34.514
    {'VER'}        6         01:14.059
    {'VET'}        7         01:01.031
    {'ZHO'}        2         01:26.962