cell array converts to matrix, how?

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!

[Jan]

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.

Answer 1

[Sean de Wolski]

B = [A{:}];
B = [B{:}];

[Ken]

Thanks Sean, this works for me.

:)

[Ken]

Sean, instead of getting B= 1 2 3 4 ... 20

I have B=12345678910...20. (one number)

any help?

Thanks again!

[Sean de Wolski]

Are the contents strings?

If so, throw in a:

B = cellfun(@str2double,B);
B = [B{:}]

[Ken]

Thanks!!

Answer 2

[Greg Heath]

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))

[Jan]

I think this should be RESHAPE instead of REPMAT.

[Anthony Hudetz]

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});

[Stephen23]

@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:

https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html

https://www.mathworks.com/matlabcentral/answers/320713-how-to-operate-on-comma-separated-lists

[Rachel Clark]

is there a way to make this work for a cell array containing cell arrays of different sizes?

[Dijle Kaya]

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