Draw a Circle in Matlab Figure

Introduction to Matlab Plot Circumvolve

MATLAB tin be used to perform operations involving geometric figures like circles, rectangles, squares etc. In this article, we will focus on circles. We volition learn how to create various types of circles in MATLAB. We can create solid or plane circles in MATLAB, which we will learn as we go ahead in the article. We will also learn how to create a circumvolve using the rectangle function.

How to Create a circle using Rectangle Part?

Let us showtime learn syntax to draw a simple circumvolve in MATLAB:

ane. Let the states first declare some points, here we are taking 500 points. The below lawmaking will create these points.

• angles = linspace(0, 2*pi, 500);

2. Permit us now declare the radius and eye of the circle. The centre volition be defined by x and y co-ordinates.

• radius = twenty;
• CenterX = 50;
• CenterY = xl;

three. Finally, we will plot our circle.

• x = radius * cos(angles) + CenterX;
• y = radius * sin(angles) + CenterY;

4. We will also write some lawmaking for our output to look visually better. This is normal formatting and we tin accommodate information technology every bit per our requirement.

• plot(x, y, 'b-', 'LineWidth', 2);
• concur on;
• plot(CenterX, CenterY, 'k+', 'LineWidth', 3, 'MarkerSize', 14);
• grid on;
• axis equal;
• xlabel('X', 'FontSize', 14);
• ylabel('Y', 'FontSize', 14);

v. This is how our input and output will expect like in MATLAB console:

Lawmaking:

angles = linspace(0, two*pi, 500);
radius = 20;
CenterX = 50;
CenterY = 40;
ten = radius * cos(angles) + CenterX;
y = radius * sin(angles) + CenterY;
plot(x, y, 'b-', 'LineWidth', 2);
hold on;
plot(CenterX, CenterY, 'k+', 'LineWidth', 3, 'MarkerSize', xiv);
grid on;
axis equal;
xlabel('X', 'FontSize', 14);
ylabel('Y', 'FontSize', 14);

Output:

As we can see in the in a higher place output, the circle is created with a radius twenty and heart (50, 40) as defined by us in the code.

How to Create a Solid 2nd Circle in MATLAB?

Next, let usa larn how to create a solid 2nd circle in MATLAB:

i. First, nosotros will be creating logical epitome of circumvolve. For this, we volition define center, diameter and the image size. Permit u.s.a. beginning create image.

• imageSizeOfX = 640;
• imageSizeOfY = 480;
• [colInImage rowsInImage] = meshgrid(i : imageSizeOfX, one : imageSizeOfY);

2. Next, we will be creating the circle within the image.

• centerOfX = 320;
• centerOfY = 240;
• radius = lxxx;
• Pixels = (rowsInImage – centerOfY).^2 …
• + (colInImage – centerOfX).^2 <= radius.^2;

three. In the above line of code, Pixels is "logical" assortment and is second. Let u.s. at present display 'Pixels'.

• image(Pixels);
• colormap([0 0 0; ane 1 1]);
• title('Paradigm of circle');

iv. This is how our input and output volition wait like in MATLAB console:

Code:

imageSizeOfX = 640;
imageSizeOfY = 480;
[colInImage rowsInImage] = meshgrid(i : imageSizeOfX, ane : imageSizeOfY);
centerOfX = 320;
centerOfY = 240;
radius = 80;
Pixels = (rowsInImage - centerOfY).^ii ...
+ (colInImage - centerOfX).^two <= radius.^2;
image(Pixels);
colormap([0 0 0; one i 1]);
championship('Image of circle');

Output:

How to create a Circle in MATLAB Using Rectangle Function?

Let the states now larn how to create a circumvolve in MATLAB using rectangle function: Here is a elementary code to achieve this:

1. Like we discussed in above examples, we will declare the radius and centre co-ordinates of the required circumvolve.

• radius = vi;
• centerX = 30;
• centerY = twoscore;
• rectangle('Position',[centerX – radius, centerY – radius, radius*2, radius*2],…
• 'Curvature',[1,1],…
• 'FaceColor','b');
• axis square;

2. We have passed 'FaceColor' equally "b" so our output circle will be of Blueish color.

Lawmaking:

radius = six;
centerX = 30;
centerY = 40;
rectangle('Position',[centerX - radius, centerY - radius, radius*2, radius*2],...
'Curvature',[1,ane],...
'FaceColor','b');
axis square;

Output:

How nosotros can Create a Simple arc in MATLAB?

Finally, let us discuss how nosotros can create a unproblematic arc in MATLAB. Equally we know that arc is nil simply a small portion of the circumvolve, lawmaking for creating an arc is also very similar to that of creating a circle.

one. Beginning we ascertain the parameters of required arc.

• xCenter = 1;
• yCenter = 1;
• radius = 4;

2. Next, we define the angle theta as required.

• theta = linspace(20, 100, 50);
• x = radius * cosd(theta) + xCenter;
• y = radius * sind(theta) + yCenter;

3. Finally, nosotros plot our divers points.

• plot(x, y, 'b-', 'LineWidth', 2);
• axis equal;
• grid on;

Code:

xCenter = ane;
yCenter = 1;
radius = iv;
theta = linspace(xx, 100, 50);
x = radius * cosd(theta) + xCenter;
y = radius * sind(theta) + yCenter;
plot(x, y, 'b-', 'LineWidth', two);
axis equal;
grid on;

Output:

Decision

And then, in this article, we learnt how to create circles in MATLAB. We can create both aeroplane circles and solid circles in MATLAB. We also learnt how we tin can leverage the Rectangle function to plot circles in MATLAB. We can also format our circle equally per our requirement.

Recommended Articles

This is a guide to Matlab Plot Circle. Hither we hash out an introduction, how to Create a circle using rectangle function, a Solid 2D Circle, a circle in MATLAB and Simple arc. Yous can also go through our other related articles to acquire more –

1. Break in MATLAB
2. Nested Loop in Matlab
3. Matlab pcolor() | Examples
4. Complete Guide to Optimset Matlab
5. Plot Vector Matlab | Functions
6. Matlab Figure | Examples
7. xlabel Matlab | Examples

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