Matlab plots my equation wrong

조회 수: 4 (최근 30일)
Melih Aksoy
Melih Aksoy 2019년 3월 22일
댓글: Melih Aksoy 2019년 3월 22일
x=-20:0.1:20;
f2=x.^10-1;
plot(x,f2)
Adsız.png
I cant understand why it sketches my basic code wrong.
  댓글 수: 5
Stephen23
Stephen23 2019년 3월 22일
편집: Stephen23 2019년 3월 22일
"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 2019년 3월 22일
I am sorry but i am really new at MATLAB. How can i set y-limits?

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Stephen23
Stephen23 2019년 3월 22일
편집: Stephen23 2019년 3월 22일
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;
  댓글 수: 1
Melih Aksoy
Melih Aksoy 2019년 3월 22일
Thank you man! It's a big help.

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