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sympy__sympy-16792

Based on the issue description and my knowledge of sympy's codebase, I can analyze this problem. The issue is in sympy's codegen.py file where the code generation logic determines the type of arguments.

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Content

Based on the issue description and my knowledge of sympy's codebase, I can analyze this problem. The issue is in sympy's `codegen.py` file where the code generation logic determines the type of arguments.

The problem occurs because when determining argument types for C code generation, the code checks if arguments appear in the expression to decide their types. When a MatrixSymbol doesn't appear in the expression, it doesn't get properly identified as an array type.

Let me provide the patch based on the issue description and sympy's code structure:

--- a/sympy/utilities/codegen.py
+++ b/sym

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