We first define the function as a variable, myFirstFun, using the keyword function, which also receives n as argument (no type specification). The latter will exist within the function. We used an integer, but 'n' could also be a vector or a matrix or a string: R handles all this nicely for us.
America in the 20th Century. The 20th century heralded the beginning of a new era in fitness. President Theodore Roosevelt, perhaps the most physically fit president ever to occupy the Oval Office, used his power and own example to encourage U.S. citizens to be physically active.
According to a Rasmussen poll conducted in 2007, six presidentsâ George Washington, Abraham Lincoln, Thomas Jefferson, Theodore Roosevelt, Franklin D. Roosevelt, and John F. Kennedy âwere rated favorably by at least 80% of Americans.n political science, historical rankings of Presidents of the United States are surveys conducted in order to construct rankings of the success of individuals who have served as President of the United States.