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Comments
several nice options (Pivot on Selection, decimal/fraction, ...)
The "Divide Row by Selection" sometimes has trouble with fractions and decimal values. The Pivot on Selection option is nice. The decimal vs. fraction option is nice. Reduce Completely would be nicer if the matrices after intermediate steps were shown. How to do the row operations of multiplying one row by a scalar or adding a multiple of one row another is a bit confusing at first. Clicking on Click here for detailed instructions helps.
A nice tool, but limited utility (really a GE spreadsheet)
Basically, this is a Gaussian elimination spreadsheet. Enter your matrix and step through reduction via Gaussian elimination. The user can specify a specific row operation to perform, or can clear a column based on a selected pivot at the click of one button. A nice tool, but limited utility.