Unformatted text preview: 18.06 (Fall '11) Problem Set 10 This problem set is due Monday, November 28, 2011 at 4pm. The problems are out of the
4th edition of the textbook. For computational problems, please include a printout of the
code with the problem set (for MATLAB in particular, diary(filename) will start a
transcript session, diary off will end one.)
1. Do problem 20 from 6.5.
2. Compute the cube root (i.e. nd D such that D3 = A) for the positive denite
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symmetric square matrix A =
.
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3. Do problem 5 from 6.6.
4. Do problem 17 from 6.6.
5. Do problem 22 from 6.6.
6. What are the singular values of an n by n Jordan block with eigenvalue 0? In MATLAB A = gallery('jordbloc', n, e) creates a Jordan block of size n and eigenvalue e.
7. Do problem 6 from 6.7.
8. Do problem 7 from 6.7.
9. Let V be the function space of polynomials with basis 1, x, x2 , x3 , x4 . What is the
matrix Mt (it should depend on t) for the operator that sends f (x) to f (x + t)? Show
that Mt and M−t are inverses.
10. Let V be the function space with basis sin(x), cos(x), sin(2x), cos(2x). What is the
matrix of the derivative operator in this basis? What is its determinant? Why is the
determinant what you get (you don't have to turn this part in, but do the mental
exercise)?
Try to think about everything you've learned in other classes, especially
those without the number 18 in them, as a linear transformation. How many can you name?
Once this clicks congratulations. That's the wizard behind the curtain.
18.06 Wisdom. 1 ...
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 Fall '14
 Yeh
 Linear Algebra, Derivative, Vector Space, Function space, symmetric square matrix

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