Converting cell of numbers to double

Hi. How do I convert a cell of numbers from cell to double? I looked up the previously asked questions but they mostly involved strings and I have numbers. I didn't post any code, I just want to know if there's any way of doing it if you have a cell class with mutiple matrices in it. How can I also store a cell class in a structure array where each "f1" and "f2" will be the field?

This is what I am having

fie =

  2×2 cell array

    {["f1"]}    {3×7 cell}
    {["f2"]}    {4×7 cell}

This is what I want

    fie =

  2×2 cell array

    {["f1"]}    {3×7 double}
    {["f2"]}    {4×7 double}

[Stephen23]

Why fix this problem later, when you could fix it when you import the data?:

https://www.mathworks.com/matlabcentral/answers/1727600-correctly-storing-data-in-cell-arrays#comment_2182285

Answer 1

[Steven Lord]

If the cells in that cell array in the upper-right cell of your outer cell array can be concatenated to form a matrix you could use cell2mat.

C = mat2cell(reshape(1:21, 3, 7), ones(3, 1), [2, ones(1, 5)]) % Making sample data

C = 3×6 cell array
    {[1 4]}    {[7]}    {[10]}    {[13]}    {[16]}    {[19]}
    {[2 5]}    {[8]}    {[11]}    {[14]}    {[17]}    {[20]}
    {[3 6]}    {[9]}    {[12]}    {[15]}    {[18]}    {[21]}

A = {'abc', C}

A = 1×2 cell array
    {'abc'}    {3×6 cell}

B = cell2mat(A{1, 2})

B = 3×7

1 4 7 10 13 16 19 2 5 8 11 14 17 20 3 6 9 12 15 18 21

A{1, 2} = B

A = 1×2 cell array
    {'abc'}    {3×7 double}

This wouldn't work if C is not of a form that can be combined together into a matrix, like if the contents of the cells in C don't have compatible numbers of rows and/or columns.

D = {[1 2], 3; [4 5 6], 7} % Can't have a matrix whose rows have different numbers of columns

D = 2×2 cell array
    {[  1 2]}    {[3]}
    {[4 5 6]}    {[7]}

cell2mat(D)

Error using cat
Dimensions of arrays being concatenated are not consistent.

Error in cell2mat (line 83)
m{n} = cat(1,c{:,n});

[Andromeda]

Thanks for your answer Steven.

I need help with cell2struct now, should I start new thread or should I ask here?

[Steven Lord]

If it's inherently related to this question you could follow up here, but if it's only tangentially related or if it can stand on its own I'd create a new thread. You could include a link in that new thread to this one as background information.

[Andromeda]

The question is related.

How do I store A in a structure array such that

structA = A : [3x7 double] 

and

structA.A =      1     4     7    10    13    16    19
                2     5     8    11    14    17    20
                3     6     9    12    15    18    21

[Steven Lord]

q = reshape(1:21, 3, 7)

q = 3×7

1 4 7 10 13 16 19 2 5 8 11 14 17 20 3 6 9 12 15 18 21

mystruct.A = q

mystruct = struct with fields:
    A: [3×7 double]

y = mystruct.A

y = 3×7

1 4 7 10 13 16 19 2 5 8 11 14 17 20 3 6 9 12 15 18 21

check = isequal(q, y) % true

check = logical
   1

Answer 2

[Fangjun Jiang]

cell2mat()

cell2struct()