Development Environment

Trial Run for Example

Try out collatzplot to see if it works correctly. Use a simple input value, for example, 3, and compare the results to those shown in the preceding table. Typing

• collatzplot(3)
  

produces the plot shown in the following figure.

The plot for 1 appears to be correct--when n = 1, the Collatz series is 1, and contains one integer. But for n = 2 and n = 3 it is wrong because there should be only one value plotted for each integer, the number of integers in the sequence, which the preceding table shows to be 2 (when n = 2) and 8 (when n = 3). Instead, multiple values are plotted. Use MATLAB debugging features to isolate the problem.

Debugging Example--The Collatz Problem

Using Debugging Features