Matlab plots my equation wrong

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Melih Aksoy
Melih Aksoy 2019-3-22
评论： Melih Aksoy 2019-3-22
x=-20:0.1:20;
f2=x.^10-1;
plot(x,f2)
Adsız.png
I cant understand why it sketches my basic code wrong.
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Stephen23
Stephen23 2019-3-22
编辑：Stephen23 2019-3-22
"was expecting to get graph of x^10-1 which is"
That is exactly what you already have. Again, you are just ignoring the multiplier at the top of the y-axis. Set the y-limits to [-1,3] and you will see the part of the curve that you expect.
Melih Aksoy
Melih Aksoy 2019-3-22
I am sorry but i am really new at MATLAB. How can i set y-limits?

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Stephen23
Stephen23 2019-3-22
编辑：Stephen23 2019-3-22
MATLAB has plotted exactly what you asked for, where the y-range ranges over:
>> x = -20:0.1:20;
>> y = x.^10-1;
>> max(y)
ans = 10239999999999
>> min(y)
ans = -1
Over that range of y-values I would not expect to be able to distinguish between 0 and -1, they will appear exactly the same on your monitor (unless you have a monitor with more than eleven trillion pixels vertically, in which case those two values will appear one pixel different from each other).
You can limit the plot's y-range if you want:
ylim([-1,3])
or reduce the x-domain:
x = -1.1:0.1:1.1;

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