MATLAB Programming 52 - 3D plots of functions

Three-Dimensional Plots

Three-dimensional plots basically display a surface defined by a function in two variables, g = f (x,y).
As before, to define g, we first create a set of (x,y) points over the domain of the function using the meshgrid command. Next, we assign the function itself. Finally, we use the surf command to create a surface plot.

The following example demonstrates the concept:

Use the peaks function to define X, Y, and Z as 25-by-25 matrices. Then, create a surface plot.

[X,Y,Z] = peaks(25);

figure
surf(X,Y,Z);

surf creates the surface plot from corresponding values in X, Y, and Z. If you do not define the color data C, then surf uses Z to determine the color, so color is proportional to surface height.

MATLAB Programming 48 - plot a graph

To plot the graph of a function, you need to take the following steps:

Define x, by specifying the range of values for the variable x, for which the function is to be plotted

Define the function, y = f(x)

Call the plot command, as plot(x, y)

Following example would demonstrate the concept.

Let us plot the simple function y = x for the range of values for x from 0 to 100, with an increment of 5.

Create a script file and type the following code:

x = [0:5:100];
y = x;
plot(x, y)

When you run the file, MATLAB displays the following plot:

MATLAB Programming 6 - Special Variables & Constants

Learn some special functions like ans, Inf, NaN, eps and commands like I and j..

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MATLAB Programming 4 - Basic metrix operations

In this section, let us discuss the following basic and commonly used matrix operations:

Addition and Subtraction of Matrices

Division of Matrices

Scalar Operations of Matrices

Transpose of a Matrix

Concatenating Matrices

Matrix Multiplication

Determinant of a Matrix

Inverse of a Matrix

Addition and Subtractions of matrix

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MATLAB Programming 3 - plotting graph

To plot the graph of a function, you need to take the following steps:

Define x, by specifying the range of values for the variable x, for which the function is to be plotted

Define the function, y = f(x)

Call the plot command, as plot(x, y)

Let us plot the simple function y = x for the range of values for x from 0 to 100, with an increment of 5.

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