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Problem with conjugate_transpose of a symbolic matrix

dAbar=diagAbar.subs(t=0);dAbar
[ 3.18953143618644Isech(x3) - 3.00000000000000 - 2.68953143618644*I
0 0]

[ 0 -3.18953143618644Isech(x3) - 3.00000000000000 + 2.68953143618644*I
0]

[ 0
0 -4]

TdiagAbar=dAbar.conjugate_transpose() + dAbar

Traceback (click to the left of this block for traceback) ... AttributeError: 'sage.rings.complex_interval.ComplexIntervalFieldElement' object has no attribute 'sech'

I hope their is an easy answer. Thanks, nonlinear

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Problem with conjugate_transpose of a symbolic matrix

dAbar=diagAbar.subs(t=0);dAbar 
[ 3.18953143618644Isech(x3) 3.18953143618644*I*sech(x3) - 3.00000000000000 - 2.68953143618644*I
0 0]

0] [ 0 -3.18953143618644Isech(x3) -3.18953143618644*I*sech(x3) - 3.00000000000000 + 2.68953143618644*I
0]

0] [ 0
0 -4]

-4] TdiagAbar=dAbar.conjugate_transpose() + dAbar

dAbar Traceback (click to the left of this block for traceback) ... AttributeError: 'sage.rings.complex_interval.ComplexIntervalFieldElement' object has no attribute 'sech'

'sech'

I hope their is an easy answer. Thanks, nonlinear