> On Nov 16, 2017, at 20:20 , rajni goyal <[email protected]> wrote:
>
> I want to know commend to get eigen values
There are a couple of ways to find out commands to get what you want.
If you have an idea of what the command might be, type its first several
letters follow by the TAB character.
If you have an object (like a matrix), type its name followed by a period, and
TAB, like this (the string: “[TAB]” represents the TAB character; it isn’t
printed, and it’s not what you type):
sage: MS=MatrixSpace(QQ,2,2)
sage: M=MS.random_element()
sage: M
[-2 2]
[-1 -2]
sage: M.det()
6
sage: M.[TAB] (or M.ei[TAB], etc.)
The latter gets you
sage: M.eigen[TAB]
M.eigenmatrix_left M.eigenspaces_right M.eigenvectors_right
M.eigenmatrix_right M.eigenvalues
M.eigenspaces_left M.eigenvectors_left
Use cursor keys to select what you want, and add parens:
sage: M.eigenvalues()
[-2 - 1.414213562373095?*I, -2 + 1.414213562373095?*I]
Note: some names are values associated with the object, not functions. Typing
a question mark after a full name (like M.eigenvalues) gets you documentation;
a double question mark gets you doc with code.
Play around with it; ask more questions. See also <http://ask.sagemath.org> as
another place to ask.
HTH
Justin
--
Justin C. Walker, Curmudgeon at Large
Institute for the Absorption of Federal Funds
-----------
I want to die, peacefully in my sleep, like my grandfather;
not screaming in terror, like his passengers.
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