2x1 structure array to structure array

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amateurintraining 2017-10-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/359385-2x1-structure-array-to-structure-array

评论： James Tursa 2017-10-2

采纳的回答： James Tursa

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I have a code:

function [ schedule ] = addGameStruct( schedule,hometeam,awayteam,homescore,awayscore )
%ADDGAMESTRUCT 
%   schedule is a structure with fields hometeam, awayteam, homescore,
%       awayscore, and winner that holds the current data and will be expanded
%       to include a new game
%   hometeam: home team's final score
%   awayscore: away team's final score
field1='hometeam'; 
field2='awayteam';
field3='homescore';
field4='awayscore';
field5='winner';
value1=hometeam;
value2=awayteam;
value3=homescore;
value4=awayscore;
value5='Cal';
 schedule=struct(field1,value1,field2,value2,field3,value3,field4,value4,field5,value5);
schedule=[schedule;struct(field1,value1,field2,value2,field3,value3,field4,value4,field5,value5)];
end

That when running the command:

calSchedule=addGameStruct(struct,'UNC','Cal',30,35)

returns the answer:

calSchedule = 
2×1 struct array with fields:
  hometeam
  awayteam
  homescore
  awayscore
  winner

However, I want to produce a structure array like the following:

>> calSchedule = addGameStruct (struct , ‘UNC ’ , ‘Cal ’ , 30 , 35)
calSchedule =
struct with fields :
hometeam : ‘UNC ’
awayteam : ‘Cal ’
homescore : 30
awayscore : 35
winner : ‘Cal ’

Why doesn't my current function produce a single structure array?

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Cedric 2017-10-2

Thank you James!

PS: well, it remains the duty of the OP to care for former questions/answers and it should not be up to us to check their history before answering.

James Tursa 2017-10-2

Frankly, your suggestion to move that schedule input to the last argument and use nargin makes a lot more sense than what is going on in this thread. I wonder why OP didn't implement it ...

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采纳的回答

James Tursa 2017-10-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/359385-2x1-structure-array-to-structure-array#answer_284016

编辑：James Tursa 2017-10-2

在 MATLAB Online 中打开

You explicitly add that 2nd struct element with this line:

schedule=[schedule;struct(field1,value1,field2,value2,field3,value3,field4,value4,field5,value5)];

Did you mean for your code to add another element to a passed in schedule? E.g.,

new_schedule = struct(field1,value1,field2,value2,field3,value3,field4,value4,field5,value5);
schedule = [schedule;new_schedule];

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James Tursa 2017-10-2

编辑：James Tursa 2017-10-2

@per: That works too. OP needs to decide how robust the function needs to be vs how much restriction to put on that 1st input. I prefer the former, but OP may prefer otherwise ...

per isakson 2017-10-2

在 MATLAB Online 中打开

@James: Agree! Here is a way to prescribe the field names.

>> sas = struct( 'f1',{}, 'f2',{} )
sas = 
0x0 struct array with fields:
    f1
    f2
>> s.f1=1;
>> s.f2=2;
>> sas = [ sas, s ]
sas = 
    f1: 1
    f2: 2

and trying to add a structure with different fields

>> sas = struct( 'f1',{}, 'f2',{} );
>> s.f1=1;
>> s.f3=3;
>> sas = [ sas, s ]
Error using horzcat
Number of fields in structure arrays being concatenated do not match. Concatenation of
structure arrays requires that these arrays have the same set of fields. 
>>