在用Matlab仿真时出现以下问题怎么改啊 Undefined function or method 'conv2' for input arguments of type 'char'.Error in ==> conv at 40c = conv2(a(:),b(:),shape);

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在用Matlab仿真时出现以下问题怎么改啊 Undefined function or method 'conv2' for input arguments of type 'char'.Error in ==> conv at 40c = conv2(a(:),b(:),shape);
在用Matlab仿真时出现以下问题怎么改啊
Undefined function or method 'conv2' for input arguments of type 'char'.
Error in ==> conv at 40
c = conv2(a(:),b(:),shape);

在用Matlab仿真时出现以下问题怎么改啊 Undefined function or method 'conv2' for input arguments of type 'char'.Error in ==> conv at 40c = conv2(a(:),b(:),shape);
参数shape应该指明是'full' 、'same'还是'valid'

在用Matlab仿真时出现以下问题 怎么改啊 Undefined function or method 'conv2' for input arguments of type 'char'.Error in ==> conv at 40c = conv2(a(:),b(:),shape);

在用Matlab仿真时出现以下问题怎么改啊 Undefined function or method 'conv2' for input arguments of type 'char'.Error in ==> conv at 40c = conv2(a(:),b(:),shape);