Hey all,
I want to find the eigenvalues of a three diagonal matrix, they comes as in the
following form, it seems that the difference between consecutive eigenvalues is
1/2, but after fifth one it doesn't work precisely, could the reason be
just that matlab causes a computational roundoff error?
Regards, Adiguzel.
0.00033596275686
0.00165720996201
0.00386786571587
0.00781155609136
0.01562499550164
0.03124999999526
0.06250000000000
0.12500000000000
0.25000000000000
0.50000000000000
1.00000000000000
error in the eigenvalues of a three diagonal matrix
Started by ●April 17, 2009
Reply by ●April 21, 20092009-04-21
If you are reading these values on the matlab command window, then what is
observed seems to be truncated which might give you an impression that it
could be a computational roundoff error !!
But, actually if you open that matrix in the array editor, you should see
the complete values (just click on the cell)
Say for example
>> pi
ans
3.1416
while the array editor will actually show you the exact content (double
click on the cell)
3.141592653589793
Good luck !
-Tilak
On Fri, Apr 17, 2009 at 10:02 PM, tugruladiguzel
wrote:
> Hey all,
> I want to find the eigenvalues of a three diagonal matrix, they comes as in
> the following form, it seems that the difference between consecutive
> eigenvalues is 1/2, but after fifth one it doesn't work precisely, could the
> reason be just that matlab causes a computational roundoff error?
> Regards, Adiguzel.
>
> 0.00033596275686
> 0.00165720996201
> 0.00386786571587
> 0.00781155609136
> 0.01562499550164
> 0.03124999999526
> 0.06250000000000
> 0.12500000000000
> 0.25000000000000
> 0.50000000000000
> 1.00000000000000
>
>
>
observed seems to be truncated which might give you an impression that it
could be a computational roundoff error !!
But, actually if you open that matrix in the array editor, you should see
the complete values (just click on the cell)
Say for example
>> pi
ans
3.1416
while the array editor will actually show you the exact content (double
click on the cell)
3.141592653589793
Good luck !
-Tilak
On Fri, Apr 17, 2009 at 10:02 PM, tugruladiguzel
wrote:
> Hey all,
> I want to find the eigenvalues of a three diagonal matrix, they comes as in
> the following form, it seems that the difference between consecutive
> eigenvalues is 1/2, but after fifth one it doesn't work precisely, could the
> reason be just that matlab causes a computational roundoff error?
> Regards, Adiguzel.
>
> 0.00033596275686
> 0.00165720996201
> 0.00386786571587
> 0.00781155609136
> 0.01562499550164
> 0.03124999999526
> 0.06250000000000
> 0.12500000000000
> 0.25000000000000
> 0.50000000000000
> 1.00000000000000
>
>
>
