MATLAB: How to write a function in interval

functionintervalroots

hi,

can you please help me to write this function code in matlab?

thank you in advance

Best Answer

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:

create a vector of x values from -2 to 5.
create a corresponding vector of y values by evaluating the function.
plot y as a function of x.
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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MATLAB: USer Defined Function problem

Since you have already written the function, let me give you some information. In MATLAB '*' is used to indicate matrix multiplication. To do scalar multiplication, change the '*' operator in your code to '.*'. Like this

function w=PBTask4p1(x)
    w = 3.2.*x.^4 - 5.*x.^2 - 7.^x;
end

Then create a vector of x values. Some thing like this

x = -5:0.1:5;

The use this x as input to PBTask4p1 and save the output in a variable. And then you can use plot() function

plot(x,w)

to create a plot.

MATLAB: How to draw a graph of this equation,

use plot functon

Best Answer

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MATLAB: USer Defined Function problem

MATLAB: How to draw a graph of this equation,

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