add cell to arraycell

i want to add sistema to oldList but i reveive error

newList=[{sistema} oldList];

Error using horzcat

Dimensions of arrays being concatenated are not consistent.

Answer 1

[Milan Bansal]

Hi Luca Re,

I understand that you wish to add a new row in the cell array "oldList" whole first element is "sistema" but are facing issues with it.

The variable "oldList" in the attached .MAT file is a cell array with 3 rows and 15 columns, where as the variable "sistema" is just a string. Hence concatenating them directly is not possible due to inconsistent dimensions. However you can add the "sistema" in the "oldList" in a new row as shown in the code snippet below:

load("matlab_cell.mat")
newRow = cell(1, 15);
newRow{1, 1} = sistema;

% Concatenate newRow with oldList to create newList
newList = [newRow; oldList]

newList = 4x15 cell array
  Columns 1 through 10

    {["ES_Live_MPV ..."]}    {0x0 double}    {0x0 double}    {0x0 double}    {0x0 double  }    {0x0 double       }    {0x0 double}    {0x0 double}    {0x0 double}    {0x0 double}
    {'ES_Live_MPV Es...'}    {[       1]}    {'ES'      }    {'On Micro'}    {'2023/12/01'}    {'From instrument'}    {[       0]}    {'Trend'   }    {'Multiday'}    {'No'      }
    {'ES_Live_MPV Es...'}    {[       1]}    {'ES'      }    {'On Micro'}    {'2024/05/01'}    {'From instrument'}    {[       0]}    {'Trend'   }    {'Intraday'}    {'No'      }
    {'ES_Live_MPV Es...'}    {[       1]}    {'ES'      }    {'On Micro'}    {'2008/01/01'}    {'From instrument'}    {[       6]}    {'Trend'   }    {'Intraday'}    {'No'      }

  Columns 11 through 15

    {0x0 double}    {0x0 double}    {0x0 double}    {0x0 double}    {0x0 double}
    {[       1]}    {[       0]}    {[       0]}    {[       0]}    {[       0]}
    {[       1]}    {[       0]}    {[       0]}    {[       0]}    {[       0]}
    {[       1]}    {[       0]}    {[       0]}    {[       0]}    {[       0]}

Hope this helps!

[Luca Re]

I realized now that they have different sizes :(

Answer 2

[LeoAiE]

Not sure if I understand your question here but I think you can do this:

oldList = {struct('field1', 1), struct('field1', 2)};
sistema = struct('field1', 3);

% Convert sistema to a cell and concatenate
newList = [{sistema}, oldList];