Create Plot 2D, 3D Matlab
The following will briefly explain the use of plot
functions to plot 2D and 3D graphics. Readers are advised to view and read
the HELP feature to get more complete information. If the plot function is
called, the Figure window will open. The default is to plot dots and be
connected in a straight line. Example,
plot (x, y)
the statement above will instruct MATLAB to plot values in
vector x on a flat axis and values in vector y on the upright axis, and are
connected by a straight line. The vectors must be the same size, for example:
Many variables can be used as arguments for plots. For
example, the following command to plot two curves on the same axis,
plot (x, y1, x, y2)
The following is an example of making a plot.
If there is only one argument in the plot function, MATLAB
plots a vector with an index of the values in the verktor.
The default for a curve is a solid line, but MATLAB has
other options. The table below provides several line type choices,
Notation

Description



Solid line

:

Dotted line

.

Dashdot line



Dashed line

If several lines are plotted on one set of axes, MATLAB
plots with a different color. Colors can be predetermined where the operators
used can be seen in the following table,
Notation

Description

b

Blue

g

Green

r

Red

c

Sian

m

Magenta

y

Yellow

k

Black

w

White

The symbol plot (*, x, 0,
etc.) can also be used to plot points. The following table contains notation
symbols that can be used for plots,
Notation

Description

.

dot

o

circle

x

x sign

+

plus

*

star

s

rectangular

d

diamond

v

triangle down

^

triangle up

<

triangle to the left

>

triangle to the right

p

pentagon

h

hexagon

To plot a curve where the
points and connecting lines exist, can use the following command,
plot (x, y, x, y, 'b *')
the command above, first
plots the points on x and y, connecting them in a straight line. Next plot the
points on x and y using the * symbol in blue.
The following is an
example of making a plot using types of lines, colors, and symbols.
The
workings of the plot3 function are the same as the plot, except the vector now
has three. Example,
plot3
(x, y, z)
All
types of lines, colors and symbols can be applied to plot3. another form of
plot from the 3D plot is surf and mash. Axis titles and labels can be made for
all plots using title, xlabel, ylabel, and zlabel.
The
following is an example of using plot3,
The following is an
example of using surf
% Make normal bivariate
standards.
% First: make points for
the domain.
[x, y] = meshgrid (3:
.1: 3, 3: .1: 3);
% Evaluates by using
normal bivariate standards.
z = (1 / (2 * pi)) * exp
(0.5 * (x. ^ 2 + y. ^ 2));
% Memplot as a surface
plot.
surf (x, y, z)
There is one way to place
multiple axes or plots in one window Figure. This is done by using the subplot
function. This function creates a matrix plot (axis) m x n in the Figure
window. The following is given an example of how to make two plots.
%
Make the leftmost plot
subplot
(1,2,1)
plot
(x, y)
%
Make the rightmost plot
subplot
(1,2,2)
plot
(x, z)
the first two arguments in
the subplot tell MATLAB about the plot layout in the figure window. The third
argument tells MATLAB the location or number of the plot. Olotplots are
numbered from top to bottom and from left to right.
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