CODEWITHSUNDEEP
matlab
zer0kai
zer0kai

Reputation: 259

Plot function within an interval

I want to plot the function "y = 4.8643*x - 3.8559*x^2 + 1.1208*x^3 - 0.1348*x^4 + 0.0057*x^5" within x = 0 and x = 9. There should be 1000 intermediate values to make the function look smooth. I also want to plot the points from the function on the positions x = [0, 0.5, 1, 6, 7, 9] in the same window. How to do this?

Thanks!

Upvotes: 0

Views: 373

Answers (1)

il_raffa
il_raffa

Reputation: 5190

You can use the function linspace to generate the x values.

Then you can plot the function using the plot function

You also have to modify the way you define the function by adding a . (a dot) before the ^ operator in order to raise to the desired power the x values elementwise

To also plot the specific x points, you can evaluate the y function on that points and then enter image description hereeither specify then in the same call to plot or to call again it after having set hold on to add the new data

% Generate the `x` values
x=linspace(0,9,1000)

% Evaluate the `y` function in the `[0 9]` interval
y = 4.8643*x - 3.8559*x.^2 + 1.1208*x.^3 - 0.1348*x.^4 + 0.0057*x.^5

% Define the set of `x` data
x1 = [0, 0.5, 1, 6, 7, 9] 

% Evaluate the `y` function in the new `x` interval
y1=4.8643*x1 - 3.8559*x1.^2 + 1.1208*x1.^3 - 0.1348*x1.^4 + 0.0057*x1.^5

Using a single call to plot

plot(x,y,x1,y1,'*')
grid on

Using two calls to plot

plot(x,y)
hold on
plot(x1,y1,'*')

Upvotes: 1

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