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Section 4.10 Practice Your Functions

Activity 4.10.

A large TV screen of height H = 50 ft is placed on the side wall of a tall building. The height from the street to the bottom of the screen is h = 130 ft. The best view of the screen is when the viewing angle, \(\theta\text{,}\) is maximized. Use MATLAB to determine the distance x at which \(\theta\) is a maximum.
To do so, define a vector x with elements ranging from 30 to 300 with spacing of 0.5. Use this vector to calculate the corresponding values of \(\theta\text{.}\) Then use MATLAB’s built-in function max to find the value of x corresponding to the largest value of \(\theta\text{.}\)

Activity 4.11.

Use MATLAB to show that the sum of the infinite series
\begin{equation*} \sum_{n=1}^{\infty} \frac{1}{2^n} = \frac{1}{2} + \frac{1}{2^2} + \frac{1}{2^3} + \; ... \end{equation*}
converges to 1. Do this by computing the sum for upper bounds N=10, 20, 30, and 40.
Hint: Create a vector with elements from 1 through N first and then use this vector to create another one whose elements are \(\frac{1}{2^n}\text{,}\) for \(n=1,...,N\text{.}\) Then add up the components of this vector.
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