Matlab files in this directory:

vb_f_stack_delete	clean up temporary files
vb_f_stack_new	create stack object by file
vb_f_stack_pop	pop data from file stack
vb_f_stack_push	push data into file stack
vb_m_stack_delete	do nothing
vb_m_stack_new	create stack object by memory
vb_m_stack_pop	pop data from memory stack
vb_m_stack_push	push data into memory stack