MATLAB: Whats wrong with this command

Question

Im trying to enter this equation which I will then use on a function I created.

y = @m sqrt(9.81*m/0.25)*tanh(sqrt(9.81*0.25/m)*4)-36;
 y = @m sqrt(9.81*m/0.25)*tanh(sqrt(9.81*0.25/m)*4)-36;
          ↑
  Error: Invalid expression. Check for missing multiplication operator, missing or unbalanced
  delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.

Answer 1

Use function handle correctly:

y = @(m) sqrt(9.81*m/0.25)*tanh(sqrt(9.81*0.25/m)*4)-36;