MATLAB: Can not get range values for y to plot from function

Question

I have created an m file. Within the file I have a function when I individually input my range of numbers I get the correct answer. I am trying to use the range of x from 0 to 600 and incremented at 100. The answers for y from the incremented x should give me values so I can plot on the graph. I get one output for y, why??

If I use lines 20 and 21 for plot it works?

Any help would be greatly appreciated.

Answer 1

y = E-((A*(x.^2))/(636+x))

needs to be

y = E-((A*(x.^2)) ./ (636+x));