# how to write a function in interval?

조회 수: 46(최근 30일)
lina 2014년 10월 21일
답변: Rupa Kupireddy 2022년 2월 8일
hi,
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lina 2014년 10월 21일
I attached the question in jpg form can't write the code :'(

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### 채택된 답변

Matt Tearle 2014년 10월 21일
MATLAB Academy can help you learn the basics of MATLAB. Also the Getting Started section of the doc, as Jose-Luis suggested.
For this specific question, you'll need to:
1. create a vector of x values from -2 to 5.
2. create a corresponding vector of y values by evaluating the function.
3. plot y as a function of x.
4. maybe pretty up the graph a bit.
For 2 you'll need to know about array operations. For 4 you can use xlabel, ylabel, title, xlim, ylim, and/or axis.
As Jose-Luis mentioned, if you need the roots exactly, you can use fzero, but that seems a bit advanced for HW#1. Because the function is a polynomial, you could also use polyval (for part 2) and roots. But, again, that seems more than is necessary.
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Matt Tearle 2014년 10월 22일
You don't need to specify the domain to the plot function, just the x values and their corresponding y values (in that order): plot(x,y)
If you want to adjust the axis limits that MATLAB chooses, use the xlim and/or ylim functions (use the doc to see how they work).

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### 추가 답변(1개)

Rupa Kupireddy 2022년 2월 8일

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