MATLAB FINANCIAL DERIVATIVES TOOLBOX Manual de usuario descargar pdf (Pagina 52)

Third Section

3. Plots and Graphs (2D and 3D)

It is quite easy to create a plot or a graph by using the variables or

parameters that have already been stored in the Matlab’s workspace. Matlab

offers a variety of build-in functions for creating simple two dimensional

plots, 3 dimensional surface plots, to combine plots to a larger one and so

on. The following subsections are a very brief and an elementary reference to

the visualization capabilities of Matlab.

3.1 Creating 2D Line Plots

The basic function for the creation of a simple 2D line plot is called:

t. Let

be a row or column vector with real data named

Y, with elements “y

, y

, …,

n”

. If

t is called as: “

t(Y)”, then a linear plot of the elements of

Y versus

its index will appear (the

t function creates/plots the pairs: (1, y

), (2, y

…, (n, y

) and connects them with a line). If for each “y

” we have an

accompanied “x

” coordinate, then the function “

t(X,Y)” plots all pairs: (x

), (x

, y

), …, (x

, y

) and connects them with a line. Note that vectors

and

X must share the same length. Additionally, if the data to be plotted are

stored in a two dimensional array, then the arguments for the

t function

can be done via the use of colon notation “:”. It is very easy to plot the

following function in the range [0,5]:

152

−

−+

Matlab’s command:

>> clear; x=0:0.5:5; y=(2*x.^2+5*x-1)./(x.^3-5); plot(x,y);

>> x=0:0.2:5; ; y=(2*x.^2+5*x-1)./(x.^3-5); plot(x,y);

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 118 119

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