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1. solve a polynomial
2. various algebraic operations
3. create an array of values
4. create an array x and then plot sqrt(x) vs. x
5. define vectors (1-d arrays)
6. define matrices (2-d arrays):
7. add vectors v and w and plot the resulting vector
8. eigenvectors, eigenvalues, SVD of matrix M
9. plot a function of 1 variable or of 2 variables
10. integrate a function
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11. solve matrix equation Ax=b
12. input numerical data from a files
13. fit a polynomial or nonlinear function to x-y data
14. define a function f(x), and plot it
15. solve & graph an ODE
16. analyze data using FFT
17. read a PNG (or GIF) file, filter, and display
18. display array data as surface, contour, density plot,
19. plot a parametric equation
20. write data to a (text) file
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