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Breaking at Blocks

The debugger lets you specify a breakpoint at the beginning or end of a block.

Breaking at a Block's Beginning

The break command lets you set a breakpoint at the beginning of a block. Setting a breakpoint at the beginning of a block causes the debugger to stop the simulation when it reaches the block on each time step.

You can specify the block on which to set the breakpoint via a block index or graphically. To specify the block graphically, select the block in the model's block diagram and enter

as shown in the following figure


.

To specify the block via its index, enter

where s:b is the block's index (see "About Block Indexes").

Note
You cannot set a breakpoint on a virtual block. A virtual block is a block whose function is purely graphical: it indicates a grouping or relationship among a model's computational blocks. The debugger warns you if you attempt to set a breakpoint on a virtual block. You can obtain a listing of a model's nonvirtual blocks, using the slist command (see "Displaying a Model's Nonvirtual Blocks").

Breaking at a Block's End

The bafter command sets a breakpoint at the end of a nonvirtual block. As with break, you can specify the block graphically or via its block index.

Clearing Breakpoints from Blocks

The clear command clears a breakpoint from the beginning or end of a block. You can specify the block by entering its block index or by selecting the block in the model diagram and entering gcb as the argument of the clear command.


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