Function returning multiple vectors

2011 6 29
5 个回答
回答已采纳
更新时间：2015 12 8
13 次查看（30 天）

1 个投票

Hi,
I'd like to assemble three vectors in a function then return them to the caller. Something along these lines:
function [A, B, C] = myFct()
A(0) = 'Lorem'; A(1) = 'ipsum';
B(1) = -1 B(2) = 10
C(0) = 'Dolor' C(1) = 'amet'
The length of A, B and C is always identical.
Any suggestion would be greatly appreciated! Many thanks in advance!

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 采纳的回答

Paulo Silva
Paulo Silva 2011-6-29

1 个投票

function [A B C]=myFct
%if the values have diferent sizes or classes replace [] with {}
A=['Lorem' 'ipsum'];
B=[-1 10];
C=['Dolor' 'amet'];
end

更多回答（4 个）

Sean de Wolski
Sean de Wolski 2011-6-29

2 个投票

[a b c] = func_name()
%define a b c
a = {'lorem','ipsum'}
b = [1 10]
c = {'Dolor','amet'}
end
Call it from the command line or another function with
[a b c] = func_name
You may also want to read about cell arrays since that's what you'll need for multiple strings.
doc cell
MATLAB begins indexing at one, not zero, by the way.
Macko
Macko 2011-6-29

0 个投票

That was incredibly fast! Many-many thanks!
Now, I can see I have simplified my problem too much. I actually want to set up the array value after doing some calculations first. The code would more likely be something like this:
function [A, B, C] = myFct(u)
if (u== 0) A(0) = 'Lorem'; else A(0) = 'Quisce'; endif
if (u<= 100) A(1) = 'ipsum'; else A(1) = 'dorum'; endif
Similar for the other two parameters.
Thanks a again!

3 个评论
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Sean de Wolski
Sean de Wolski 2011-6-29
if (u== 0)
A(1) = 'Lorem';
else
A(1) = 'Quisce';
end
Remember what I said about zero based indexing! (it doesn't exist in ML)
Paulo Silva
Paulo Silva 2011-6-29
you got the code almost done but like Sean said 'MATLAB begins indexing at one, not zero, by the way.'
if (u== 0)
A(1) = 'Lorem';
else
A(1) = 'Quisce';
end
Paulo Silva
Paulo Silva 2011-6-29
Sean you are too fast lol

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Macko
Macko 2011-6-29

0 个投票

You guys are the best! :)
Here's my code:
function [objectIDs, animationNames, animationValues] = TEST_vSendMultipleEvents % This block supports the Embedded MATLAB subset. % See the help menu for details.
objectIDs(1) = -1;
animationNames(1)='Anim_1';
animationValues(1) = 1;
objectIDs(2) = -1;
animationNames(2)='Anim_2';
animationValues(2) = 100;
I'm getting this error: Undefined function or variable 'objectIDs'. The first assignment to a local variable determines its class.
Function 'Embedded MATLAB Function' (#40.166.175), line 5, column 1: "objectIDs"
Must be something really trivial, I'm overseeing here...

4 个评论
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Sean de Wolski
Sean de Wolski 2011-6-29
objectDs is an oputput not an input. to have it taken as an input
function [objectIDs, animationNames, animationValues] = TEST_vSendMultipleEvents(objectIDs);
doc function
is probably worth a read.
Macko
Macko 2011-6-29
Exactly! objectIDs is an output (vector) and I'm trying to set its values when the above error shows...
Paulo Silva
Paulo Silva 2011-6-29
Embedded MATLAB Functions are always that annoying, the problem is that on those functions before you work with variables you must give them something of the same class (and probably size).
Initialize every variable you use with a value
objectIDs=[0 0];
animationNames=['' ''];
animationValues=[0 0];
%now insert your code
Macko
Macko 2011-6-29
That seems to have solved the problem! Many thanks to both of you!

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Truong Dang Manh
Truong Dang Manh 2015-12-8
编辑：Truong Dang Manh 2015-12-8

0 个投票

Sorry to interrupt you guys but the code above does not work, you have to modify: "A(1) = 'Lorem';" to "A(1,:)='Lorem'; ", because what you're trying to do is to create an array of strings. See here for more information: http://stackoverflow.com/questions/7100841/create-an-array-of-strings. P/S: I'm new here so please correct me if i'm wrong

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