Need to get dimensions to match and to return a 0 x 0 matrix for empty row.

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DJ V
DJ V 2016-12-16
评论： Jan 2016-12-18
This code give me a 1 x 0 array for any row that is empty. I need it to return a 0 x 0 empty matrix for any row that is empty. It is presently giving me an error and proclaiming that the dimensions of the object in the "if" statement don't match.
function S = logipack( V)
m = size(V, 1);
S = cell(m, 1);
for r = 1:m
S{r} = find(V(r, :));
if find(V(r,:))==[]
S{r}= [];
end
end
end
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DJ V
DJ V 2016-12-17
编辑：DJ V 2016-12-17
V is a matrix of 1's and 0's. IF there is a 1 in a row the logipack software is supposed to identify the column numbers where it occurs. If there are no 1's, the software is supposed to return an empty vector of size 0 x 0.
Jan
Jan 2016-12-18
@DJ V: You discus the problem "find(V(r,:))==[]" here, although the answer I've given at https://www.mathworks.com/matlabcentral/answers/317178-what-is-wrong-with-this#answer_247497 contains the correct isempty() already. By this way, you do not catch attraction, but discourage readers to care about your questions.

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采纳的回答

John BG
John BG 2016-12-16
DJ
MATLAB moans, not because of if condition mismatch, but because the operator '==' doesn't work for cells, try this:
cell1 =
'a' [1] '9' [2x2 double]
>> cell2={'b' 2}
cell2 =
'b' [2]
>> cell1==cell2
Undefined operator '==' for input arguments of type 'cell'.
So,
1.- your 1st line in the for loop doesn't make much sense,
S{r} = find(V(r, :))
so I changed it to
S{r} = V(r, :)
may be it's not what you want but at least now S is not empty.
2.- instead of
if find(V(r,:))=={}
try
if isempty(V(r,:))
or better
if isempty(V(r))
So the following, although not sure whether of much use, at least it doesn't crash
V=randi([-10 10],1,10)
m = size(V, 2);
S = cell(m, 1);
for r = 1:m
S{r} = V(r);
if isempty(V(r))
S{r}= [];
end
end
if you find this answer useful would you please be so kind to mark my answer as Accepted Answer?
To any other reader, please if you find this answer of any help solving your question,
please click on the thumbs-up vote link,
thanks in advance
John BG
<mailto:jgb2012@sky.com jgb2012@sky.com>
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DJ V
DJ V 2016-12-17
Just in case anyone is curious, this code works and passes the grader:
function out = logipack(V)
m = size(V, 1);
S = cell(m, 1);
for r = 1:m
S{r} = find(V(r, :));
end
for r = 1:m
for q = 1:m
if q==1
count=0;
end
if V(r,q)==0
count= count+1;
end
if count==m
S{r,1}=[];
end
end
end
out = S;
end

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更多回答（1 个）

the cyclist
the cyclist 2016-12-16
You can probably take advantage of the isempty command here.

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