Save inputs from a GUI into 3D matrix (always at the last position)

    %prompt command for k number and length
    prompt = {'k0:','Length:'};
    dlg_title = 'Straight Duct specs';
    num_lines = 1;
    SDelements = {'0','0'};
    Straightduct = inputdlg(prompt,dlg_title,num_lines,SDelements)

%insert values in function
  sizeStorageMatrix=size(StorageMatrix);      %get size of the storage matrix
  dimT=sizeStorageMatrix(1,3);   %take the number of matrices
      if dimT==1
          StorageMatrix(1:2,1:2,1)=straight_duct(str2num(SDelements{1}),         str2num(answer{2}), Mach_Frange(1,1))

        else 
            StorageMatrix(1:2,1:2,dimT+1)=straight_duct(str2num(SDelements{1}), str2num(answer{2}), Mach_Frange(1,1))

        end 
% code
  end

This is my code for a GUI to create a 2by2 matrix which i'd like to save in a 3D matrix. This matrix should be saved in the first position of the 3D matrix and when i push the button more it should be saved in that corresponding position in the 3D matrix. I have, however, no idea to do this. Currently i declared my StorageMatrix at the beginning but i get an error when i run: variable storagematrix is not recognized. I've googled, i've run through the matlab help files but i can't seem to find my solution. Any hints?

kind regards,

Youri

[Walter Roberson]

You do not show any initialization for StorageMatrix, so you would not be able to take size() of it.

[Youri]

i know the code isn't perfect, ive initialized storageMatrix in the openingfnc. I just have no idea on how to access and store Guidata as a 3D matrix. Like i said, i've looked everywhere but not being an experienced programmer i don't have the insight in all the words and ways of the code.