MATLAB introduction

                                                    About MATLAB

• The Golden Ratio:-What is the world's most interesting number? Perhaps you like ¼, or e, or 17.
  Some people might vote for Á, the golden ratio, computed here by our ¯rst Matlab
  statement.
  phi = (1 + sqrt(5))/2
  This produces
  phi =
  1.6180
  Let's see more digits.
  format long
  phi
  phi =
  1.61803398874989

 If you have forgotten the quadratic formula, you can ask Matlab to ¯nd
the roots of the polynomial. Matlab represents a polynomial by the vector of its
coe±cients, in descending order. So the vector
p = [1 -1 -1]
represents the polynomial
p(x) = x2 ¡ x ¡ 1:
The roots are computed by the roots function.
r = roots(p)
produces
r =
-0.61803398874989
1.61803398874989
These two numbers are the only numbers whose reciprocal can be computed by
subtracting one.

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