How can I plus (append) string in each loop?

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Yen Hai
Yen Hai 2016-3-12
评论： Image Analyst 2016-3-13
I have:
person=[1,2];
for i=1:length(person)
if (person(i))== 1
str=sprintf('Person A');
elseif (output(i))==2
str=sprintf('Person B');
elseif (output(i))==3
str=sprintf('Person C');
elseif (output(i))==4
str=sprintf(' Person D');
elseif (output(i))==5
str=sprintf('Person E');
else
str=sprintf('System can not detect!');
end
end
%How can I plus result in each loop, like this:
%str='Person A Person B'
How can I plus result in each loop, like this:
str='Person A Person B'
Thank for your help!

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采纳的回答

Image Analyst
Image Analyst 2016-3-12
Here's another one of many ways. Not necessarily the best, but along the lines of what you started with. (Is this homework?)
person=[1, 2];
finalString = ''; % Initialize
for i=1:length(person)
if (person(i))== 1
str=sprintf('Person A');
elseif (person(i))==2
str=sprintf('Person B');
elseif (person(i))==3
str=sprintf('Person C');
elseif (person(i))==4
str=sprintf('Person D');
elseif (person(i))==5
str=sprintf('Person E');
else
str=sprintf('System can not detect!');
end
finalString = [finalString, ' ', str]; % Append this string.
end
fprintf('The final string = %s\n', finalString);
  2 个评论
Yen Hai
Yen Hai 2016-3-13
Thanks "Image Analyst"! Yes, it's my homework. I am studying about image processing, I have just begun with matlab programming. Hopefully I can get some help from you!
Image Analyst
Image Analyst 2016-3-13
Sure, just ask, but remember to attach your images and explain the larger context of what you want.

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更多回答（1 个）

dpb
dpb 2016-3-12
编辑：dpb 2016-3-12
I presume output is a typo intending person. But you don't need a loop nor any logical tests at all...
>> people=['A':'Z']; % define population of names from which to pick
>> persons=1:3:8; % chose some arbitrarily
>> sprintf('Person %2c ',people(person))
ans =
Person A Person D Person G
>>
BTW, if don't want the trailing blank or it's a bother, simply wrap with
strtrim(sprintf('Person %2c ',people(person)))

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