Informatics1-2019/Lab10

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A lap 2019. december 2., 11:06-kori változata

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Tartalomjegyzék

Sage

Server

https://jupyter.math.bme.hu:8888/

You can use this, or install it on your own from here: http://www.sagemath.org/

Tasks

Using variables

  1. Let Y be your year of birth, M the month, and D the day, create these variables.
  2. How much is Y divided by D? Associate this value with the b variable.
  3. Let r be the remainder of Y / M.
  4. What's the difference r - b?

Symbolic calculations

  1. Is it true that the square root of the square of a number is the number itself?
    1. Use bool to convert to logical value
    2. Is it true for real numbers? Positive numbers? (assume)
  2. Prove (x-y)(x+y) == x^2-y^2
  3. Prove (-1)^(2n) == 1 where n is integer!

Sage functions, methods

  1. Is 2018 a prime? (use the is_prime() function)
  2. Were you born on a prime day? (use the D variable!)
  3. Solve the equation D*x^2 + M*x - b*r = 0 using the solve(fv, variable) function! (x needs to be a symbolic variable!)
  4. Solve the equation numerically! Use the find_root(fv == 0, min, max) function, where min and max defines an interval where Sage looks for the solution.
  5. Solve the above equation symbolically (make D, M, b, r symbolic variables, then use solve)!
  6. Differentiate the function sin(x)cos(x)x^2.
  7. Integrate the previous function.
  8. Calculate the limit of (1 + 3/n)^4n, if n->oo
  9. Let f be the following function: f = (x+2*y)^3
  10. Substitute 3 into x; then 4 into x and 2 into y. What's the result? ( use the subs() method of f)
  11. Expand f! (expand())
  12. Using the above, calculate the Taylor series of sin(x)cos(x)x^2 up until the 4th member. (you can differentiate and integrate a function f by f.diff(x))

Plotting with Sage (plot)

  1. Plot a cosine curve from 0 to 4*pi!
  2. Plot the (x-2)^2 + 3 polynomial from -2 to 4, color it green!
  3. Plot next to the previous one (using the show function) the function x^3-3*x + 6 in red!
  4. Plot a circle: cirlce((coordinates of the center), radius, optional). The "optional" can be: color, aspect_ratio=True so that the ratio of the x and y axis are kept, otherwise we might get an ellipse.

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