cell array converts to matrix, how?
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I want to convert cell 'A' to a matrix 'B'.
A=
columns 1 through 10
{1x1 cell} {1x1 cell} {1x1 cell} {1x1 cell}...
columns 1 through 20
{1x1 cell} {1x1 cell} {1x1 cell} {1x1 cell}...
I want to have a 'B' as:
B =
1 2 3 4 5 6 7 8 9 ... 20
I tried B(1)=cell2mat(A{1}), but can I avoid doing it one by one?
Thanks!
1 个评论
Jan
2012-7-20
As usual it would be helpful if you post the input data in valid Matlab syntax, such that we can try our suggestion by copy&paste them. Currently it is not clear what the "{1x1 cell}" contains. Looking at your comments it seems, like these are cell strings.
采纳的回答
Sean de Wolski
2012-7-19
B = [A{:}];
B = [B{:}];
4 个评论
Ken
2012-7-19
Sean de Wolski
2012-7-19
Are the contents strings?
If so, throw in a:
B = cellfun(@str2double,B);
B = [B{:}]
Ken
2012-7-19
更多回答（1 个）
Greg Heath
2012-7-20
0 个投票
The expressions converting a "row cell of cells" to the corresponding "row vector" are
B = [ A{ : } ]
C = [ B{ : } ]
The expression for converting a 2-D cell of cells to the corresponding 2-D matrix is
C = repmat(cell2mat( [ A{:} ] ),size(A))
5 个评论
Jan
2012-7-20
I think this should be RESHAPE instead of REPMAT.
Anthony Hudetz
2019-1-9
Does not work for me. I tried this and get an error:
a = {1:5,2:10,3:4,4:6,5:9}
C = reshape(cell2mat( [ a{:} ] ),size(a))
Brace indexing is not supported for variables of this
type.
Error in cell2mat (line 42)
cellclass = class(c{1});
@Anthony Hudetz: note that Greg Heath wrote "The expression for converting a 2-D cell of cells..." Do you have a cell array of cell arrays, as Greg Heath wrote? No, you have a cell array of numeric arrays:
a = {1:5,2:10,3:4,4:6,5:9}
Perhaps this does what you want:
>> v = [a{:}]
v =
1 2 3 4 5 2 3 4 5 6 7 8 9 10 3 4 4 5 6 5 6 7 8 9
You can learn more about how this works here:
Rachel Clark
2021-1-12
is there a way to make this work for a cell array containing cell arrays of different sizes?
Dijle Kaya
2021-3-30
编辑：Dijle Kaya
2021-3-30
Maybe so:
a = strings(1,length(A)) % or a = zeros(1,length(A)), if A is an integerarray
for i = 1:length(A)
a(1,i) = (convertCharsToStrings(A{i})) %if A is a Stringarray
end
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