dbupcommand changes the current workspace context to the workspace of the calling M-file function. This command allows you to examine the calling M-file function by using any other MATLAB command. In this way, you can determine what led to the arguments being passed to the called function.
dbup commands change the workspace context to each previous calling M-file function on the stack until the base workspace context is reached. (It is not necessary, however, to move back to the current breakpoint to continue execution or to step to the next line.)
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