# Function plot limits produces errors

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Gavin Seddon on 21 Jun 2016
Answered: the cyclist on 21 Jun 2016
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.
Karan Gill on 21 Jun 2016
Your command works fine for me. Can you explain why the resulting curve is wrong? I don't see an error in your output -- only a warning.

the cyclist on 21 Jun 2016
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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