RREF with complex numbers not working properly

[AnalogJoe]

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?

[roadrunner]

Try:

rref([[−0.3-0.6*i,−0.6],[0.75,0.3-0.6*i]],1)

-road

[AnalogJoe]

(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?

[roadrunner]

It's the number of columns that the reduction is done on. I attached the relevent info from the xcas manual.

-road

   

[roadrunner]

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

[AnalogJoe]

Thank you! I will take a look.