submat

Returns the input matrix reduced along indicated dimensions

Description

This is a function to aid/simplify access to subsections of a n-d matrix.

Y=SUBMAT(X,DIM,LIST) creates a matrix Y that is the matrix X reduced along dimension DIM to the indices in LIST. If DIM is a list of dimensions, LIST is used to reduce each dimension. LIST also may be any string that can be evaluated to valid indices along DIM such as '1:end-1', '[2 4]', 'X(2,:)', and 'some_other_function'. DIM can not be a string!

Y=SUBMAT(X,DIM1,LIST1,DIM2,LIST2,...) allows for access to multiple dimensions independently.

• Acknowledgements: This submission has inspired the following:; submat_noeval, subarray
• MATLAB release: MATLAB 7.5 (R2007b)
• Other requirements: Not sure if it works for Matlab pre-7.

[Duane Hanselman]

Creates a large string that is passed to EVAL to do the work. Yet another example of why to avoid using EVAL.

[Garrett Euler]

Thanks for the advice.

File id 19350 was submitted as a non-eval alternative for this function. I prefer the use of eval here, so I will not delete this submission as your comment for the alternative submission suggests. The alternative function will be renamed to clarify the distinction.