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aliazmat
Joined: 14 Mar 2008
Posts: 46
Helped: 2
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 04 Sep 2008 16:23 complex number matlab |
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Hi all,
when we have some complex number like
a=0.1250 - 3.1230i and when we run command in matlab
a>=0
the result will be 1. I want to ask that how does matlab evaluates it because if we take magnitude of it by
abs(a) this comes 3.1255
so how to decide that the given complex number is great than or equal to 0?
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aqua_salman
Joined: 15 Nov 2006
Posts: 139
Helped: 7
Location: Islamabad, Paksitan
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| 04 Sep 2008 20:29 Re: complex number matlab |
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matlab syntax is similar like C language.
if you want to compare the value of a, you would write if a>==0
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zorro
Joined: 06 Sep 2001
Posts: 324
Helped: 36
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| 04 Sep 2008 20:50 complex number matlab |
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The correct syntax is "a>=0" without the double "==".
In the numerical comparison, the real part is taken.
Regards
Z
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aliazmat
Joined: 14 Mar 2008
Posts: 46
Helped: 2
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| 04 Sep 2008 22:48 Re: complex number matlab |
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U mean that if a complex number is compared with "0" it means it is compared with only real part and imaginary part does not have any role in that
for example
0.03+9i >= 0 , answer will be 1
-0.03+9i >= 0 , answer will be 0
0.03-9i >= 0 , answer will be 1
-0.03-9i >= 0 , answer will be 0
am I right ?
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zorro
Joined: 06 Sep 2001
Posts: 324
Helped: 36
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| 05 Sep 2008 13:37 complex number matlab |
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Yes, you are, aliazmat.
From Matlab help:
The relational operators are <, >, <=, >=, ==, and ~=. Relational operators perform element-by-element comparisons between two arrays. They return a logical array of the same size, with elements set to true (1) where the relation is true, and elements set to false (0) where it is not. The operators <, >, <=, and >= use only the real part of their operands for the comparison. The operators == and ~= test real and imaginary parts.
Regards
Z
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xulfee
Joined: 27 May 2008
Posts: 230
Helped: 25
Location: Pakistan
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| 09 Sep 2008 4:45 complex number matlab |
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| 1 means ur statment is true
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aliazmat
Joined: 14 Mar 2008
Posts: 46
Helped: 2
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| 10 Sep 2008 11:05 Re: complex number matlab |
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| thank you very very much for your help .
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