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@@ -2725,15 +2725,17 @@ The filter structure describes a data partitioning operation, to be given to the
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This function fills the @code{child_interface} structure with interface
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information for the @code{id}-th child of the parent @code{father_interface} (among @code{nparts}).
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@code{void (*filter_func)(void *father_interface, void* child_interface, struct starpu_data_filter *, unsigned id, unsigned nparts);}
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+@item @code{nchildren}:
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+This is the number of parts to partition the data into.
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@item @code{get_nchildren}:
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-This returns the number of children.
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+This returns the number of children. This can be used instead of @code{nchildren} when the number of
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+children depends on the actual data (e.g. the number of blocks in a sparse
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+matrix).
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@code{unsigned (*get_nchildren)(struct starpu_data_filter *, starpu_data_handle initial_handle);}
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@item @code{get_child_ops}:
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In case the resulting children use a different data interface, this function
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returns which interface is used by child number @code{id}.
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@code{struct starpu_data_interface_ops_t *(*get_child_ops)(struct starpu_data_filter *, unsigned id);}
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-@item @code{nchildren}:
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-This is the number of parts to partition the data into.
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@item @code{filter_arg}:
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Some filters take an addition parameter, but this is usually unused.
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@item @code{filter_arg_ptr}:
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