GAINESVILLE, Fla.—Joe Louis Clark, the baseball bat and bullhorn-wielding principal whose unwavering commitment to his students and uncompromising disciplinary methods inspired the 1989 film “Lean on Me,” died at his Florida home on Tuesday after a long battle with an unspecified illness, his family said. He was 82. At crime- and drug-ridden Eastside High School in Paterson, New Jersey, Clark expelled 300 students in a single day for fighting, vandalism, abusing teachers, and drug possession. That lifted the expectations of those who remained, continually challenging them to perform better. Clark’s unorthodox methods, which included roaming the hallways with a bullhorn and a baseball bat, won him both admirers and critics nationwide. President Ronald Reagan offered Clark a White House policy adviser position after his success at the high school. Morgan Freeman starred as Clark in the 1989 film “Lean on Me” that was loosely based on Clark’s tenure at Eastside. …