如何根据 Matlab 中的行名从表中计算值

Question

在 Matlab 中，我有 2 个 table，1 个 table 包含所有其他 table 的值。第一个 table 被命名为 T1

freq = [2;3;4;5;6;54;3;4];
words = {'finn';'jake';'iceking';'marceline';'shelby';'bmo';'naptr';'simon'};

T1 = table(freq,...
      'RowNames',words)

Table 2 是

freq = [10;3;6;3]
words = {'finn';'jake';'simon';'shelby'}
T2 = table(freq,...
      'RowNames',words)

如何将 T2 中的值用于 T1 并像这样打印：

T3=
                                                                                   freq2
finn      %is scanned from T2, words that arent contain in T2, is ignored     2/10    %(2 is taken from T2)     
jake                                                                          3/3  %(3 is taken from T2)   
iceking                                                                       4 or 0 or etc   %(as long as this name is ignored)
marceline                                                                     5 or 0 or etc %(as long as this name is ignored)
shelby                                                                        6/3 %(as long as this name is ignored)
bmo                                                                           54 or 0 or etc  %(as long as this name is ignored)
naptr                                                                         3 or 0 or etc  %(as long as this name is ignored)
simon                                                                         4/6  %(6 is taken from T2)

Answer 1

这应该可以做到。

%copy T1 to be T3
T3=T1; 
%find where the elements in each table are
[~,T1Ind,T2Ind] = intersect(T1.Properties.RowNames,T2.Properties.RowNames);

%modify the values
T3{T1Ind,1}=T3{T1Ind,1}./T2{T2Ind,1};

%modify the others if you want to 
T3{~ismember(T1.Properties.RowNames,T2.Properties.RowNames),1}=0; %or etc

（如果您需要它，只需保留预编辑）

%If it should be based on the smaller table
T4 = table(T2.freq./T1{T2.Properties.RowNames,1},'RowNames',T2.Properties.RowNames)

如果您打算更多地使用 tables，您应该阅读 matlab 文档中的 "Access Data in a Table"，它对于学习从 table 中提取数据的不同方法非常有用