problem while comparing complex numbers...
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From: us on 9 May 2010 09:07 "dhanamjaya rao" > but..if i pass the values from a FUNCTION SAMPLE5 as follows... > r=sample5(); well... obviously SAMPLE5 is not returning what you think it should - and, most likely, your facing a typical FP problem... no more help as CSSM does not know the function's engine... us
From: dhanamjaya rao on 9 May 2010 09:26 "us " <us(a)neurol.unizh.ch> wrote in message <hs6c1m$td$1(a)fred.mathworks.com>... > "dhanamjaya rao" > > but..if i pass the values from a FUNCTION SAMPLE5 as follows... > > r=sample5(); > > well... obviously SAMPLE5 is not returning what you think it should - and, most likely, your facing a typical FP problem... > no more help as CSSM does not know the function's engine... > > us sample5 program continue as follows..... function z=sample5() clc; clear all; ifftin=qam64(); %here QAM modulated data will be input to the below iift and it is iift in=Columns 1 through 6 7.0000 + 1.0000i 1.0000 + 3.0000i 3.0000 - 3.0000i 5.0000 + 7.0000i 3.0000 - 1.0000i -5.0000 - 1.0000i Columns 7 through 12 -1.0000 - 3.0000i 3.0000 - 5.0000i 7.0000 + 5.0000i -3.0000 - 7.0000i 1.0000 - 7.0000i 7.0000 + 5.0000i Columns 13 through 18 3.0000 - 1.0000i 5.0000 - 7.0000i -5.0000 - 3.0000i -1.0000 + 3.0000i -5.0000 - 7.0000i 3.0000 - 7.0000i Columns 19 through 24 -7.0000 - 3.0000i 1.0000 - 5.0000i -7.0000 - 3.0000i -3.0000 + 7.0000i 7.0000 - 3.0000i 7.0000 - 7.0000i Columns 25 through 30 -5.0000 + 3.0000i -7.0000 + 7.0000i -5.0000 + 5.0000i -5.0000 + 5.0000i 5.0000 + 3.0000i 1.0000 + 3.0000i Columns 31 through 36 -3.0000 - 5.0000i 1.0000 + 7.0000i -1.0000 + 7.0000i 7.0000 + 3.0000i 1.0000 - 3.0000i -5.0000 - 1.0000i Columns 37 through 42 1.0000 - 5.0000i 7.0000 - 5.0000i -5.0000 - 3.0000i 1.0000 + 5.0000i -1.0000 - 7.0000i -1.0000 + 1.0000i Column 43 7.0000 - 7.0000i ..... ifftout=ifft(ifftin,64); z=fft(ifftout,64);.... this is the function called....
From: dpb on 9 May 2010 10:15 dhanamjaya rao wrote: .... > z=fft(ifftout,64);.... > > this is the function called.... Try FAQ 6.1 at <http://matlabwiki.mathworks.com/MATLAB_FAQ> --
From: dhanamjaya rao on 9 May 2010 10:55 dpb <none(a)non.net> wrote in message <hs6g57$ke5$1(a)news.eternal-september.org>... > dhanamjaya rao wrote: > ... > > > z=fft(ifftout,64);.... > > > > this is the function called.... > > Try FAQ 6.1 at <http://matlabwiki.mathworks.com/MATLAB_FAQ> > > -- my problem is if i am comparing two explicitly specified matrices i am getting the result....... but if im passing those matrices by function sample5 as specified above... i am not getting the result....
From: dpb on 9 May 2010 11:30
dhanamjaya rao wrote: > dpb <none(a)non.net> wrote in message > <hs6g57$ke5$1(a)news.eternal-september.org>... >> dhanamjaya rao wrote: >> ... >> >> > z=fft(ifftout,64);.... >> > > this is the function called.... >> >> Try FAQ 6.1 at <http://matlabwiki.mathworks.com/MATLAB_FAQ> >> >> -- > > > my problem is if i am comparing two explicitly specified matrices i am > getting the result....... > > but if im passing those matrices by function sample5 as specified > above... i am not getting the result.... And the FAQ (and the references therein) explain why... Computing the values is different than converting from a specified number of decimal digits to internal representation. Read the last part of the FAQ again about dangers of using "==" for floating-point comparisons and the solution to same. -- |