Make a matrix from the string values from textboxes in GUI

I retrieve several values from different textboxes in my GUI, and each textbox contains a number. I'm trying to make a matrix of these string values. I've tried a few ways to do this, but all I get is this error:

??? Error using ==> vertcat
CAT arguments dimensions are not consistent.

Error in ==> gui_gettable at 78
Q =[QTBox1 QTBox2 QTBox3 QTBox4 QTBox5 QTBox6 QTBox7 QTBox8

How can I make a valid matrix from the string value in the textboxes?

QTBox1 = get(handles.txtQTBox1, 'String');
QTBox2 = get(handles.txtQTBox2, 'String');
QTBox3 = get(handles.txtQTBox3, 'String');
QTBox4 = get(handles.txtQTBox4, 'String');
QTBox5 = get(handles.txtQTBox5, 'String');
QTBox6 = get(handles.txtQTBox6, 'String');
QTBox7 = get(handles.txtQTBox7, 'String');
QTBox8 = get(handles.txtQTBox8, 'String');
 
QTBox9 = get(handles.txtQTBox9, 'String');
QTBox10 = get(handles.txtQTBox10, 'String');
QTBox11 = get(handles.txtQTBox11, 'String');
QTBox12 = get(handles.txtQTBox12, 'String');
QTBox13 = get(handles.txtQTBox13, 'String');
QTBox14 = get(handles.txtQTBox14, 'String');
QTBox15 = get(handles.txtQTBox15, 'String');
QTBox16 = get(handles.txtQTBox16, 'String');
 
Q = [QTBox1 QTBox2 QTBox3 QTBox4 QTBox5 QTBox6 QTBox7 QTBox8
    QTBox9 QTBox10 QTBox11 QTBox12 QTBox13 QTBox14 QTBox15 QTBox16];
 
Q = str2num(Q);

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