Problem with matlab auto rounding !!
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From: Rania on 2 Apr 2010 11:32 hello professionals .. Im a beginner and need your help.. I have a matrix which contains numbers like 5*(10^9) and 6.5*(10^-5) , both in the same matrix.. when i enter the values, matlab rounds the small values of order (10^-5) to zero... i need the accurate numbers to work with & need to find the exact values... does anybody know how to get over this problem ??? the answer returned is something like this: H = 1.0e+007 * -0.0000 0 -0.0000 -0.0000 -0.0000 0 0.0000 0.0000 0 0 0 0.502 -0.0002 -0.0035 -2.1300 4.2 0 0 -0.0000 0 0 0 0 0 -0.0000 i need the exact values to be shown :( thanks in advance :)
From: Mensanator on 2 Apr 2010 16:57 On Apr 2, 2:32 pm, Rania <r.tah...(a)gmail.com> wrote: > hello professionals .. Im a beginner and need your help.. > > I have a matrix which contains numbers like 5*(10^9) and 6.5*(10^-5) , both in the same matrix.. when i enter the values, matlab rounds the small values of order (10^-5) to zero... i need the accurate numbers to work with & need to find the exact values... does anybody know how to get over this problem ??? > > the answer returned is something like this: > > H = > > 1.0e+007 * > > -0.0000 0 -0.0000 -0.0000 -0.0000 > 0 0.0000 0.0000 0 0 > 0 0.502 -0.0002 -0.0035 -2.1300 > 4.2 0 0 -0.0000 0 > 0 0 0 0 -0.0000 > > i need the exact values to be shown :( > thanks in advance :) Are they actually rounded, or just displayed that way?
From: Rania on 2 Apr 2010 14:59 I think they are rounded ... I already have the exact solution of the operation im trying to do by matlab ... the solution i have is so far from the answer i get from matlab ... ---> If they are not rounded but just shown that way, is it possible to view the complete numbers & have the exact solution ?? thanks again & appreciate your help
From: Mensanator on 2 Apr 2010 19:20
On Apr 2, 5:59 pm, Rania <r.tah...(a)gmail.com> wrote: > I think they are rounded ... I already have the exact solution of the operation im trying to do by matlab ... the solution i have is so far from the answer i get from matlab ... > > ---> If they are not rounded but just shown that way, is it possible to view the complete numbers & have the exact solution ?? Well, I don't know anything about Matlab, but if you look at your posted example, some cells have 0 where others hav 0.0000. That usually indicates a display problem and the calculations are being done correctly, i.e., the 0.0000 is actually 0.000000023876 whereas 0 is actually 0. Now if a cell should have 0.000000023876 but is displaying 0, you probaly do have a rounding problem. > > thanks again & appreciate your help |