Automatically deleting lots of blocks from a model obviously involves risk, so save a backup and proceed at your own risk.
The advice from Jonas on using approaches that don't depend on deleting blocks is good. Follow that if you can.
OK, if you must do batch delete this is how.
If you know, the "kind" of thing you want to delete your goal is straight forward using
find_system
delete_block
The "kind" of block is slightly complicated.
For some Blocks, all you need to know is BlockType.
For blocks that are masked subsystems or sfunctions, you need to know the MaskType.
To help figure out the "kinds" in your model, I've attached a utility I wrote long ago to find BlockTypes and MaskTypes in a model.
This is not production quality so use at your own risk.
Here is an example call and output:
>> res = find_all_types(bdroot)
res =
11×6 table
Name Occurances ReferenceLink BlockType MaskType SFunction
_________________________ __________ ______________________________________________________ ______________________ _________________________ _______________
{'DataTypeConversion' } 23 {0×0 char } {'DataTypeConversion'} {0×0 char } {0×0 char }
{'Inport' } 18 {0×0 char } {'Inport' } {0×0 char } {0×0 char }
{'Outport' } 17 {0×0 char } {'Outport' } {0×0 char } {0×0 char }
{'SubSystem' } 9 {0×0 char } {'SubSystem' } {0×0 char } {0×0 char }
{'ModelReference' } 6 {0×0 char } {'ModelReference' } {0×0 char } {0×0 char }
{'Concatenate' } 6 {0×0 char } {'Concatenate' } {0×0 char } {0×0 char }
{'Constant' } 5 {0×0 char } {'Constant' } {0×0 char } {0×0 char }
{'Scope' } 2 {0×0 char } {'Scope' } {0×0 char } {0×0 char }
{'Data Type Propagation'} 1 {'simulink/Signal\nAttributes/Data Type\nPropagation'} {'S-Function' } {'Data Type Propagation'} {'sfix_dtprop'}
{'Switch' } 1 {0×0 char } {'Switch' } {0×0 char } {0×0 char }
{'UnitDelay' } 1 {0×0 char } {'UnitDelay' } {0×0 char } {0×0 char }
This shows about 10 BlockTypes and one MaskType used in the model I tested.
To delete all the blocks of a certain kind, run code like the following.
It tries to enforce that you saved the model before, attempting to deleting a bunch of stuff.
function dangerous_delete_all_blocks_of_type(sys,blockType,maskType)
% delete blocks of a certain type
%
% dangerous_delete_all_blocks_of_type(sys,blockType,maskType)
open_system(sys);
rootSys = bdroot(sys);
if strcmp('on', get_param(rootSys,'Dirty') )
error('Model is dirty. Batch deleting blocks not recommended. Save %s\n',rootSys);
end
if ~isempty(blockType)
propName = 'BlockType';
propValue = blockType;
else
propName = 'MaskType';
propValue = maskType;
end
%
% For info on options, see help find_system
%
blks = find_system(sys,'FollowLinks','off','LookUnderMasks','off',...
propName,propValue);
for iBlk = 1:length(blks)
curBlk = blks{iBlk};
fprintf('Deleting\n %s\n\n',curBlk)
delete_block(curBlk);
end
end
That's the basic idea.
