a. User defined matrix types:

Response	Count	Percent
Very useful	61	29%
Somewhat useful	89	42%
Not useful	57	27%

b. Using optional arguments in the language interface:

Response	Count	Percent
Very useful	43	20%
Somewhat useful	112	53%
Not useful	54	25%

c. Automatic memory allocation of the work space:

Response	Count	Percent
Very useful	134	63%
Somewhat useful	54	25%
Not useful	22	10%

d. More complicated matrix data structures:

Response	Count	Percent
Very useful	70	33%
Somewhat useful	102	49%
Not useful	36	17%