How to plot graph with multiple values of x in a function
22 views (last 30 days)
Show older comments
This code should produce graphs for y=(x^3)-(4*(x^2))-x-4. My code is incorrect because it is raising the whole x matrix to powers in the plot() function rather than considering each element in the matrix. How do I solve this?
Thanks
count=0
for i=[3,5,7,10,20,100]
count=count+1;
x=linspace(-5,2,i)
subplot(2,3,count)
plot(x,(x^3)-(4*(x^2))-x-4,'-xr')
end
0 Comments
Accepted Answer
the cyclist
on 11 Nov 2021
Edited: the cyclist
on 11 Nov 2021
You need to use elementwise operations:
count=0;
for i=[3,5,7,10,20,100]
count=count+1;
x=linspace(-5,2,i);
subplot(2,3,count)
plot(x,(x.^3)-(4*(x.^2))-x-4,'-xr')
end
0 Comments
More Answers (2)
Sulaymon Eshkabilov
on 11 Nov 2021
A small (but crucial) err that is elementwise operation needed, e.g.:
count=0;
for i=[3,5,7,10,20,100]
count=count+1;
x=linspace(-5,2,i);
subplot(2,3,count)
plot(x,(x.^3)-(4*(x.^2))-x-4,'-xr')
end
0 Comments
Sulaymon Eshkabilov
on 11 Nov 2021
You may also consider to display a legend showing the number of x values taken for calc and plot in every iteration:
count=0;
for i=[3,5,7,10,20,100]
count=count+1;
x=linspace(-5,2,i);
subplot(2,3,count)
plot(x,(x.^3)-(4*(x.^2))-x-4,'-xr')
legend(['N_x = ', num2str(i)], 'location', 'best')
end
1 Comment
the cyclist
on 11 Nov 2021
I like the legend idea. In this particular case, I would use
'location','southeast'
rather than 'best'.
See Also
Categories
Find more on Legend in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!