1. The problem statement, all variables and given/known data The problem was "Plot the following equation with MatLab, for values of x from -3 to 6. 2. Relevant equations y = x^4 - 4x^3 - 6x^2 + 15 3. The attempt at a solution I created a function. function r = graph(x) for i = 1:x r(i) = i^4 - 4*i^3 - 6*i^2 + 15; end Then I passed fplot(graph(10), [0 10000]) through the command prompt. It returned Error using fcnchk (line 107) FUN must be a function, a valid string expression, or an inline function object. Error in fplot (line 61) fun = fcnchk(fun); Any ideas on what this means?