Why can't I add a block to my model using add_block?

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MathWorks Support Team
I want to add a block in a Simulink model named myModel.mdl. When I open the model and attempt to add a block using the following code:
open myModel.mdl
add_block('simulink/Sources/In1','myModel/myin1')
I sometimes receive the following error:
??? There is no block named 'simulink/Sources/In1'

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采纳的回答

MathWorks Support Team
The Simulink library must be loaded to programmatically add blocks in a model. The LOAD_SYSTEM function can be used to programmatically load the Simulink library as in this example:
load_system('simulink')
open myModel.mdl
add_block('simulink/Sources/In1','myModel/myin1')

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