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+--- Thread: RREF with complex numbers not working properly (/thread-19147.html)
RREF with complex numbers not working properly - AnalogJoe - 11-15-2022 03:20 PM
I have a singular matrix with complex numbers:
first row: [-0.3-0.6i, -0.6]
second row: [0.75, 0.3-0.6i]
if I use RREF with my Prime I get the identity matrix, which is not correct, making the same input in Matlab gives me the correct result which is [1, 0.4-0.8j; 0, 0].
Any ideas?
RE: RREF with complex numbers not working properly - roadrunner - 11-15-2022 11:27 PM
Try:
rref([[−0.3-0.6*i,−0.6],[0.75,0.3-0.6*i]],1)
-road
RE: RREF with complex numbers not working properly - AnalogJoe - 11-16-2022 05:03 AM
(11-15-2022 11:27 PM)roadrunner Wrote: Try:
rref([[−0.3-0.6*i,−0.6],[0.75,0.3-0.6*i]],1)
-road
It worked! may I ask what is the ,1 for?
RE: RREF with complex numbers not working properly - roadrunner - 11-16-2022 12:48 PM
It's the number of columns that the reduction is done on. I attached the relevent info from the xcas manual.
-road
[attachment=11432]
RE: RREF with complex numbers not working properly - roadrunner - 11-16-2022 12:52 PM
Hmmm, it appears tha in exact mode you don't need the 1:
rref([[(-3-6*i)/10,-6/10],[75/100,(3-6*i)/10]])
also works.
-road
RE: RREF with complex numbers not working properly - AnalogJoe - 11-17-2022 11:11 PM
Thank you! I will take a look.