Add stiffness matrix feature to SystemElements class

[bldrkamal]

This pull request introduces a new method, get_stiffness_matrix(), to the SystemElements class. The method allows users to retrieve and print the stiffness matrix of a specific element by its ID.

Key changes:
New Method: get_stiffness_matrix(element_id) in SystemElements.
This method accepts an element_id as input.

• It checks if the element exists and is an instance of the Element class.

• If the element contains a stiffness matrix, it prints and returns the matrix.

• If the element doesn't exist or doesn't have a stiffness matrix, appropriate error messages are printed.

This feature makes it easier to inspect and validate the stiffness matrices of elements within the system, especially useful for debugging and structural analysis. Some students that will like to create their global stiffness matrix will find this useful.

[github-actions]

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[smith120bh]

@bldrkamal : This looks great - thanks so much! Your code and PR is well-documented, you added tests, and there's obvious value of what you're adding! Please just fix the linting issues, and I think mypy is also going to complain at you that you don't have a type definition on your function. Let me know if you need any help with any of that!

And I'll see if I can go fix the repo settings here so that I don't have to keep clicking "Approve Workflow Run" on your PR, and it actually auto-runs the tests!

[bldrkamal]

I really appreciate. I made the necessary changes and I hope it works.

…

On Wed, 16 Oct 2024, 10:08 Brooks Smith, ***@***.***> wrote: @bldrkamal <https://github.com/bldrkamal> : This looks great - thanks so much! Your code and PR is well-documented, you added tests, and there's obvious value of what you're adding! Please just fix the linting issues, and I think mypy is also going to complain at you that you don't have a type definition on your function. Let me know if you need any help with any of that! And I'll see if I can go fix the repo settings here so that I don't have to keep clicking "Approve Workflow Run" on your PR, and it actually auto-runs the tests! — Reply to this email directly, view it on GitHub <#332 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AHUDVRYOFFDSY7QP5BLSNETZ3YUI5AVCNFSM6AAAAABP3U4JT2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDIMJWGE4DKNJTGA> . You are receiving this because you were mentioned.Message ID: ***@***.***>