problem with cell array e unique

>> class(RankList)

ans =

    'cell'

>> typeRank=unique(cell2table(RankList))
Error using tabular/unique
Unable to group rows using unique values of the table variable 'RankList'.  UNIQUE returned an error.

Caused by:
    Error using matlab.internal.math.uniqueCellstrHelper
    Cell array input must be a cell array of character vectors.
    
    

Answer 1

[Star Strider]

There are 9 empty cells in ‘RankList’ and they were causing the problem.

Try this —

LD = load('matlab_RankList.mat')

LD = struct with fields:
    RankList: {351×1 cell}

RankList = LD.RankList

RankList = 351×1 cell array
    {'AD_Multiday_Reversal'}
    {'BP_Multiday_Bias'    }
    {'BP_Multiday_Reversal'}
    {'BP_Multiday_Reversal'}
    {'BP_Multiday_Reversal'}
    {'BP_Intraday_Reversal'}
    {'BP_Multiday_Reversal'}
    {'BP_Multiday_Trend'   }
    {'BP_Multiday_Reversal'}
    {'BP_Multiday_Reversal'}
    {'BP_Intraday_Reversal'}
    {'CC_Multiday_Bias'    }
    {'CL_Intraday_Bias'    }
    {'CL_Intraday_Trend'   }
    {'CL_Intraday_Bias'    }
    {'CL_Intraday_Trend'   }

idx = cellfun(@(x)~isempty(x), RankList);                   % Logical Vector

Empty_Cells = nnz(~idx)

Empty_Cells = 9

RankListFull = RankList(idx)                                % Non-Empty Entries

RankListFull = 342×1 cell array
    {'AD_Multiday_Reversal'}
    {'BP_Multiday_Bias'    }
    {'BP_Multiday_Reversal'}
    {'BP_Multiday_Reversal'}
    {'BP_Multiday_Reversal'}
    {'BP_Intraday_Reversal'}
    {'BP_Multiday_Reversal'}
    {'BP_Multiday_Trend'   }
    {'BP_Multiday_Reversal'}
    {'BP_Multiday_Reversal'}
    {'BP_Intraday_Reversal'}
    {'CC_Multiday_Bias'    }
    {'CL_Intraday_Bias'    }
    {'CL_Intraday_Trend'   }
    {'CL_Intraday_Bias'    }
    {'CL_Intraday_Trend'   }
    {'CL_Intraday_Reversal'}
    {'CL_Multiday_Trend'   }
    {'CL_Multiday_Trend'   }
    {'CL_Intraday_Trend'   }
    {'CL_Intraday_Bias'    }
    {'CL_Intraday_Bias'    }
    {'CL_Intraday_Bias'    }
    {'CL_Intraday_Bias'    }
    {'CL_Intraday_Trend'   }
    {'CL_Intraday_Reversal'}
    {'CL_Intraday_Trend'   }
    {'CL_Multiday_Trend'   }
    {'CL_Multiday_Reversal'}
    {'CL_Intraday_Trend'   }

RankListUnique = unique(RankListFull)                       % Unique Entries (Sorted)

RankListUnique = 90×1 cell array
    {'AD_Multiday_Reversal'  }
    {'BP_Intraday_Reversal'  }
    {'BP_Multiday_Bias'      }
    {'BP_Multiday_Reversal'  }
    {'BP_Multiday_Trend'     }
    {'CC_Multiday_Bias'      }
    {'CL_Intraday_Bias'      }
    {'CL_Intraday_Reversal'  }
    {'CL_Intraday_Trend'     }
    {'CL_Multiday_Reversal'  }
    {'CL_Multiday_Trend'     }
    {'C_Multiday_Trend'      }
    {'EC_Intraday_Bias'      }
    {'EC_Intraday_Reversal'  }
    {'EC_Intraday_Trend'     }
    {'EC_Multiday_Reversal'  }
    {'EC_Multiday_Trend'     }
    {'ES_Intraday_Bias'      }
    {'ES_Intraday_Reversal'  }
    {'ES_Intraday_Trend'     }
    {'ES_Multiday_Bias'      }
    {'ES_Multiday_Reversal'  }
    {'ES_Multiday_Trend'     }
    {'FBTP_Intraday_Bias'    }
    {'FBTP_Multiday_Trend'   }
    {'FC_Multiday_Trend'     }
    {'FDAX_Intraday_Bias'    }
    {'FDAX_Intraday_Reversal'}
    {'FDAX_Intraday_Trend'   }
    {'FDAX_Multiday_Bias'    }

RankListUnique = unique(RankListFull, 'stable')             % Unique Entries (Un-sorted)

RankListUnique = 90×1 cell array
    {'AD_Multiday_Reversal'  }
    {'BP_Multiday_Bias'      }
    {'BP_Multiday_Reversal'  }
    {'BP_Intraday_Reversal'  }
    {'BP_Multiday_Trend'     }
    {'CC_Multiday_Bias'      }
    {'CL_Intraday_Bias'      }
    {'CL_Intraday_Trend'     }
    {'CL_Intraday_Reversal'  }
    {'CL_Multiday_Trend'     }
    {'CL_Multiday_Reversal'  }
    {'C_Multiday_Trend'      }
    {'EC_Intraday_Reversal'  }
    {'EC_Multiday_Reversal'  }
    {'EC_Intraday_Bias'      }
    {'EC_Intraday_Trend'     }
    {'EC_Multiday_Trend'     }
    {'ES_Multiday_Reversal'  }
    {'ES_Intraday_Reversal'  }
    {'ES_Multiday_Bias'      }
    {'ES_Intraday_Trend'     }
    {'ES_Multiday_Trend'     }
    {'ES_Intraday_Bias'      }
    {'FBTP_Multiday_Trend'   }
    {'FBTP_Intraday_Bias'    }
    {'FC_Multiday_Trend'     }
    {'FDAX_Intraday_Bias'    }
    {'FDAX_Intraday_Trend'   }
    {'FDAX_Intraday_Reversal'}
    {'FDAX_Multiday_Reversal'}

.