How can I get plot with smooth lines from this data?

Hi.

I want to get plot with smoother lines from this data.

a=(500,1000,1700,1300,1400,3900,3400,3000,2200,2400,3300,3800,4500,4500,4400,4300,4600,3700)

x=(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18)

Thanks.

Answer 1

[Star Strider]

If you do not have the Curve Fitting Toolbox, use the core MATLAB spline (link) function:

a=[500,1000,1700,1300,1400,3900,3400,3000,2200,2400,3300,3800,4500,4500,4400,4300,4600,3700];
x=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18];
xsm = linspace(min(x), max(x));
asm = spline(x, a, xsm);

figure
plot(x, a, '+r')
hold on
plot(xsm, asm, '-b')
hold off
grid

[Muhammad Taseer Islam]

Thanks Star Strider.

It really works.

[Star Strider]

As always, my pleasure!

Answer 2

[KALYAN ACHARJYA]

a=[500,1000,1700,1300,1400,3900,3400,3000,2200,2400,3300,3800,4500,4500,4400,4300,4600,3700]';
x=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18]';
f=fit(x,a,'smoothingspline')
plot(f);

[Muhammad Taseer Islam]

Thanks for your comment.

[KALYAN ACHARJYA]

Is my answered in incorrect?

[Muhammad Taseer Islam]

it is giving errors .

[KALYAN ACHARJYA]

Have you have run the code, as provided (Copy and run)?

Can you show me the error?

[Muhammad Taseer Islam]

Oh sorry KALYAN ACHARJYA.

that was my mistake.

now it is working.

thank you u very much for your rapid reply.

Answer 3

[infinity]

Hello,

There is an option that you can refer,

a1 = smooth(a);
plot(x,a1)

There are many types of smooth function, you may read links below for more options.

https://it.mathworks.com/help/curvefit/smooth.html

https://it.mathworks.com/help/curvefit/smoothing.html

[Muhammad Taseer Islam]

Thank You for your help.