Good afternoon. I'm trying to move away from things like Matlab and SciPy 
to do linear algebra work. 
Something I notice I do a lot is indexing operations, such as 
MATRIX[ row ] [ column ]

I'm looking at the "math/matrix" library provided here:, and don't see anything of 
this sort; I only see things like 


Being able to access and modify a particular entry in the matrix would be 
very useful in specifying operations to matrices. For example, given a 
matrix *G*, one might want to perform indexing operations to get the matrix 

Is this possible with the math/matrix library? 

Additionally, would there be a way to implement a version of 
matrix-map-row/cols that uses an index? 

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