关于这个问题：
在顶部模型中以及子系统中都有多个“增益”块，在其中找到附件的样本模型（trial_model.mdl'）。以下命令可以找到模型“ abile_model”中存在的所有“增益”块的路径和名称：
>> block_name = find_system（'trial_model'，，，，'blocktype'，，，，'获得'）
Here block_name will be an n*1 cell array containing the names of all the ‘Gain’ blocks present in the model ‘trial_model.mdl’.
Then you can consider to run the following loop to change the parameters of each of the block. You can refer to the following sample code:
>> n =长度（block_name）
为了i=1:1:n
set_param（block_name {i，1}，'获得'，，，，'15'）%%Changing ‘Gain’ of all the ‘Gain’ blocks to 15
结尾
