ASKSAGE: Sage Q&A Forum - Latest question feedhttp://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Mon, 30 Nov 2015 04:48:03 -0600elementary matrices for elementary row operationshttp://ask.sagemath.org/question/31194/elementary-matrices-for-elementary-row-operations/Hello,
I'm using Sage to get random_matrix for Students.
random_matrix(QQ,4,4, algorithm="echelonizable", rank=4, upper_bound=15)
Is there an option to get all elementary matrices for all elementary matrix-operations by using for example matrix.inverse()?
Thanks for the help!SebastianMon, 30 Nov 2015 04:48:03 -0600http://ask.sagemath.org/question/31194/integrating with unspecified constantshttp://ask.sagemath.org/question/8652/integrating-with-unspecified-constants/in the online sage I typed:
var('x,a,b')
integrate(1/sqrt(b+a/x), x)
And it answered:
Traceback (click to the left of this block for traceback)
...
Is b positive or negative?
Of course b is positive but there is no way to answer it's question or to predefine b as positive, so far as I know.
so I used b^2 and got a question "Is b > 0?". Well yes b>0. So is a.
a and b are part of a physics problem. They change with the initial conditions.
This is my first day with Sage. I have no idea what trace back is good for.
I don't know how to use this thing so send a copy of the answer to me at august04@frontier.com.
WVPhysicistSat, 21 Jan 2012 08:49:12 -0600http://ask.sagemath.org/question/8652/