Why is a segmentation violation produced when I set a uicontrol's Callback to a cell array containing empty matrices in MATLAB?

I use something similar to the following code:

u = uicontrol('Style','popupmenu','String',{'one';'two';'three'})

cb = cell(1);

set(u,'Callback',cb)

When I run this code, MATLAB produces a segmentation violation:

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 Segmentation violation detected at Tue Mar 25 11:01:35 2003

 ----------

 Configuration:

 MATLAB Version: 6.5.0.180913a (R13)

 Operating System: Microsoft Windows 2000

 Window System:Version 5.0 (Build 2195: Service Pack 3)

 Processor ID: x86 Family 15 Model 2 Stepping 4, GenuineIntel

 Virtual Machine:Java 1.3.1_01 with Sun Microsystems Inc. Java HotSpot(TM) Client VM

 (mixed mode)

 Register State:

 EAX = 00000000EBX = 00000000

 ECX = 2fd56e44EDX = 00000000

 ESI = 2fdba6b8EDI = 2fd5a078

 EBP = 00dfc3dcESP = 00dfc3c0

 EIP = 7a5778aaFLG = 00010206

 Stack Trace:

 [0] gui.dll:public: __thiscall MCallback::MCallback(struct mxArray_tag const *)(0x2fd5a078, 2, 0x2fc7a160, 0) + 170 bytes

 [1] gui.dll:_MatrixToMCallback(0x2fd56e20, 0x2fdbb0e0, 0x2fc7a160, 0x00dfc464) + 73 bytes

 [2] hg.dll:_Matrix_to_MCallback_set_check_fcn(0x2fd56e20, 0x2fc7a160, 0x7a0d3a00, 0) + 19 bytes

 [3] hg.dll:_HG_SetSwitchYard(0x2fc7a160, 0x7a0a1a50, 0x2fd56e20, 0x00dfc48c) + 822 bytes

 [4] hg.dll:void __cdecl gobjSet(struct GObject_tag *,struct GO_PropID_tag *,struct mxArray_tag *)(0x2fc7a160, 0x2fdbb0e0, 0x2fd56e20, 0x00dfc550) + 83 bytes

 [5] hg.dll:_HO_Set(0x2fc7a160, 0x2fdbb0e0, 0x2fd56e20, 0x019a93b0 "à°Û/") + 21 bytes

 [6] hg.dll:_hobjSetPairs(0x2fc7a160, 0x019a93b0 "à°Û/", 0x019a84b0 " nÕ/", 1) + 173 bytes

 [7] hg.dll:void __cdecl gobjSetPairs(struct GObject_tag *,struct GO_PropID_tag * *,struct mxArray_tag * *,int)(0x2fc7a160, 0x019a93b0 "à°Û/", 0x019a84b0 " nÕ/", 1) + 84 bytes

 [snip]

Answer 1

[MathWorks Support Team]

This issue has been verified in MATLAB 6.5 (R13).

When using a cell array as the value for a callback, the cell elements should not contain empty matrices. The first cell element should contain a function handle, or a string containing the name of a function. The first two inputs to the specified function will automatically be the handle for the callback object and event data. Elements 2...N of the cell array will be passed as inputs 3...N+1 to the function.