how to write a function in interval?

조회 수: 18 (최근 30일)
lina
lina 2014년 10월 21일
답변: Rupa Kupireddy 2022년 2월 8일
hi,
can you please help me to write this function code in matlab?
thank you in advance
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José-Luis
José-Luis 2014년 10월 21일
편집: José-Luis 2014년 10월 21일
What have you tried so far?
I would recommend you to read the "Getting started" part of the documentation.
You might want to look at the fzero() function.
doc fzero
doc plot
doc fplot
lina
lina 2014년 10월 21일
I attached the question in jpg form can't write the code :'(

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채택된 답변

Matt Tearle
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.
  댓글 수: 5
lina
lina 2014년 10월 21일
pardon Matt but there is another problem in plotting dimension
x=(-2:5);
y=x.^4-5.*(x.^3)+2.*(x.^2)+6.*(x)-4;
plot(y,[-2,5]);
I get this error ??? Error using ==> plot Vectors must be the same lengths.
what should I do?
thank u in advance
Matt Tearle
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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Rupa Kupireddy
Rupa Kupireddy 2022년 2월 8일

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