MATLAB: Function plot limits produces errors

errorfplotlimits

fplot (@(x) was used to generate a figure the resulting curve shape is wrong and errors are produced. The correct X minimum and maximum values were not represented correctly. my command Used was taken from the 'help' menu. The errors were
>> fplot (@(x)  (1211*x^6)/2500 + (9953*x^5)/10000 + (193*x^4)/125 - (681*x^3)/200 - (9549*x^2)/10000 + (3117*x)/1000 + 304/25,  [0, 40000])
Warning: Function fails on array inputs. Use element-wise operators to increase speed. 
> In matlab.graphics.function.FunctionLine>getFunction
  In matlab.graphics.function.FunctionLine/set.Function_I
  In matlab.graphics.function.FunctionLine/set.Function
  In matlab.graphics.function.FunctionLine
  In fplot>singleFplot (line 223)
  In fplot>@(f)singleFplot(cax,{f},limits,extraOpts,args) (line 182)
  In fplot>vectorizeFplot (line 182)
  In fplot (line 153)
is the error with my limits? Can anyone help? G.

Best Answer

You are getting that warning because you are using array multiplication in your function. Try this instead:
fplot (@(x)  (1211*x.^6)/2500 + (9953*x.^5)/10000 + (193*x.^4)/125 - (681*x.^3)/200 - (9549*x.^2)/10000 + (3117*x)/1000 + 304/25,  [0, 40000])
Note that I used element-wise multiplication in the function.
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