Funzioni MATLAB:  la funzione fplot

» help fplot

 FPLOT  Plot function.

    FPLOT(FUN,LIMS) plots the function specified by the string FUN between the x-axis limits specified by LIMS = [XMIN XMAX]. 

Using  LIMS = [XMIN XMAX YMIN YMAX] also controls the y-axis limits.

FUN must be the name of an M-file function or a string with variable x   that may be passed to EVAL, such as 'sin(x)', 'diric(x,10)' or    '[sin(x),cos(x)]'.  ……..

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FPLOT(FUN,LIMS,'LineSpec') plots with the given line specification.

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[X,Y] = FPLOT(FUN,LIMS,...) returns X and Y such that Y = FUN(X).

    No plot is drawn on the screen.

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Esempi :

»

» fplot ('[tan(x),sin(x),cos(x)]',2*pi*[-1 1 -1 1])

» fplot ( 'log', [0   2*pi] )

Warning: Log of zero.

> In c:\matlab\toolbox\matlab\specgraph\fplot.m at line 85

»

» fplot ( 'log', [0.1   2*pi] )

» fplot ( 'log',  [0.1 2*pi], ‘o’)

» [x,y] = fplot('sin',[-0.1 0.1]);

» [x y]

ans =           -0.1000   -0.0998

                   -0.0996   -0.0994

                   -0.0988   -0.0986

                   -0.0972   -0.0970

                   -0.0940   -0.0939

                   -0.0876   -0.0875

                   -0.0748   -0.0747

                   -0.0492   -0.0492

                    0.0020    0.0020

                    0.1000    0.0998

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Alba C. Simoncelli

- MATLAB (nov. 2002) - pag.17

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