MaplePrimes - answers and comments on Question, selectremove positive real part of complex number

Re Re

Joe Riel — Thu, 11 Mar 2010 21:17:52 Z

selectremove( z -> Re(z) >= 0, ... );

yah thanks that works.

mapgvva — Fri, 12 Mar 2010 03:52:50 Z

yah thanks that works.

hi i have another question

mapgvva — Fri, 12 Mar 2010 04:13:18 Z

hi i have another question actually if you dont mind.

see my results from select remove come as [a,b,c,d...] all negative complex. but i need them in the form {m=a},{m=b}, etc. how do i do this?

thank you

yah thanks, i got maple 12

mapgvva — Sat, 13 Mar 2010 00:57:11 Z

yah thanks, i got maple 12 so the previous one works fine.

hello, i have another

mapgvva — Wed, 17 Mar 2010 00:49:23 Z

hello, i have another question regarding the selectremove function. now i need to be able to remove the -ve imaginary values along with the -ve Real(z) and -ve Real. for example,

[-488.7131707, 488.7131707, -508.9035841, 508.9035841, -813.1980103, 813.1980103, -401.6125371*I, 401.6125371*I]

so here there are three -ve Real and one -ve imaginary root. i need my code to be able to select the -ve imaginary root, but also the same code should do this: selectremove( z -> Re(z) >= 0, ... ); as well. please help.

thank youu

yeah ok ill try and explain

mapgvva — Wed, 17 Mar 2010 01:20:48 Z

yeah ok ill try and explain better.

selectremove( z -> Re(z)<0 and Im(z) < 0, ..

this will filter out the negative real(z). ok. and will filter out the negative imaginary(z). But the problem is, there may be complex numbers with positive real and negative imaginary (i.e. a - b*i), and these i dont want.

so what i want is, negative real(z), negative real, and also negative imaginary numbers only.

making sense?