how to get this graph to plot correctly?

2017 11 13
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更新时间：2017 11 13
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f(x) = x^8 − 5x^4 + e^x − 7
I've tried f=@(x)x.^8 - 5*x.^4 + exp(x) - 7; and setting x = [-5:0.1:5]; and then just using the plot function, but it doesnt seem right...

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Star Strider
Star Strider 2017-11-13

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This works for me:
f=@(x)x.^8 - 5*x.^4 + exp(x) - 7;
x = [-5:0.1:5];
plot(x, f(x))
It is essentially your code. What ‘doesn’t seem right’ about the plot?

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MaraBoj
MaraBoj 2017-11-13
if I type in the function on a graphing calculator the graph looks different than on matlab
Star Strider
Star Strider 2017-11-13
Trust the MATLAB plot!
Steven Lord
Steven Lord 2017-11-13
You won't see much detail by default because the limits on the Y axis span a wide range of values. 5^8 is near 400000, while 0^8 is 0. You'd need to zoom into the plot or change the axis limits to see the detail for small values of x.
axis([-2 2 -20 20])

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