I am trying to create a function form a vector from my matrix and I do not understand where my mistake is?

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Laurence Guevremont
评论： dpb 2016-9-29
function A=combined (V)
for V(k)= A(i,j)
k=1;
for
i=1;
j=1;
k=k+1;
end
end
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Laurence Guevremont
Laurence Guevremont 2016-9-27
编辑：Laurence Guevremont 2016-9-27
Ok so I need transform my matrix into a vector so example: A= [1 2 3; 4 5 6; 7 8 9] And then form a vector A A=[1 2 3 4 5 6 7 8 9]
My function right now does not work, there is a mistake on line 2
dpb
dpb 2016-9-27
Indeed, there are several issues but the one of defining the for...end loop indices and range is key. To do the requested function, using "linear addressing" would be a good way to proceed. Look those up in the documentation and study for loops...

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回答（3 个）

Moe_2015
Moe_2015 2016-9-27
编辑：Moe_2015 2016-9-27
You should avoid using a for loop here. You can do something like this:
function myVector=combined(myMatrix)
myVector = reshape(myMatrix,1,numel(myMatrix));
end
dpb
dpb 2016-9-27
"...transform my matrix into a vector"
Really don't need a function for this; Matlab has syntax to do it already. A previous answer shows reshape, except I'd suggest to simply use it ( reshape, that is) inline as shown there in the function instead.
There's another Matlab idiom that's even more compact--
A=A(:).'; % convert A of unspecified dimensions to row vector
NB: the .' transpose operator to return the requested row vector instead of the column vector colon returns.
James Tursa
James Tursa 2016-9-28
Here is an outline of what you need to be using for the for loops (seems to be a requirement for this assignment).
% Insert any initialization code here
for i = 1:size(V,1)
for j = 1:size(V,2)
% Insert your assignment etc code here
end
end

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