2013-02-14 78 views
3

我有一個1xn結構。結構包含一些帶有數字單元格的字段。不是每個結構都有相同的字段。所以我想將缺少的字段添加到結構中。但我沒有明白。一次設置多個字段/向單元添加新字段struct

% Mimimal example 
% I have same cells, imported from csv by csv2cell() 

clear 

dataCell{1}={"field_a","field_b","field_c"; ... 
    1,2,3; ... 
    4,5,6}; 

dataCell{2}={"field_a","field_b","field_d"; ... 
    1,2,4; ... 
    4,5,8}; 

% Then I convert them to a struct 
for ii=1:numel(dataCell)  
DataStruct{ii}=cell2struct((dataCell{ii}(2:end,:)),[dataCell{ii}(1,:)],2); 
    try fields=[fields, fieldnames(DataStruct{ii})']; % fails for the first loop, because 'fields' doesn't exist yet 
    catch 
    fields=[fieldnames(DataStruct{ii})']; % create 'fields' in the first loop 
    end 
end 

% Create a list of all existing fields 
fields=unique(fields); 

% Now look for the missing fields and add them to the struct 
for jj=1:numel(DataStruct) 
    missing_fields{jj} = setdiff(fields,fieldnames(DataStruct{jj})); 
    for kk=1:numel(missing_fields) 
    DataStruct{jj}.(missing_fields{jj}{kk})=NaN*zeros(numel(dataCell{jj}(2:end,1)),1); % Execution fails here! 
    end 
end 

這導致了一個錯誤:

倍頻錯誤

error: invalid assignment to cs-list outside multiple assignment 
error: called from: 
error: ~/example.m at line 29, column 44 

Matlab的錯誤

Insufficient outputs from right hand side to satisfy comma separated 
list expansion on left hand side. Missing [] are the most likely cause. 

的問題是,即的DataStruct{1}.field_a輸出不是一個矩陣或一個細胞,但多個答案。將單元格轉換爲矩陣還是導入csv的可能性更大?

另一個很好的可能性會是這樣的

DataStruct{jj}=setfields(missing_fields{jj},NaN_Values{jj}) 

其中missing_fields{jj}NaN_Values都是細胞相同的長度,這樣我可以在一次設置多個領域。

回答

2

您使用deal功能輸出分配給輸入。對於你的例子:

% Now look for the missing fields and add them to the struct 
for jj=1:numel(DataStruct) 
    missing_fields{jj} = setdiff(fields,fieldnames(DataStruct{jj})); 
    for kk=1:numel(missing_fields) 
    [DataStruct{jj}.(missing_fields{jj}{kk})] = deal(NaN*zeros(numel(dataCell{jj}(2:end,1)),1)); 
    end 
end 

注意,你會得到一個Index exceeds matrix dimensions,但是這是由於不同的問題 - 我敢肯定,你就可以到一個理清!

+0

第二個錯誤是'for kk = 1:nueml(missing_fields {{jj}})' - 我忘記了{{jj}} – telemachos 2013-02-14 10:11:50

2

繼最後的question之後 - 您可以使用deal命令。

段:

a=struct('f1',num2cell(1:10)) 
missing_field = 'test' 
[a.(missing_field)]=deal(NaN)