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Help on-line, formatul datelor, optiuni de salvare


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Help on-line, formatul datelor, optiuni de salvare

Help on-line

Pentru rularea MATLAB pe un PC trebuie pur si simplu executat un dublu click cu mouse-ul pe icon-ul MATLAB. Daca sistemul de operare nu este de tip Windows (este de tip UNIX) trebuie tastat matlab dupa prompter-ul sistemului de operare.

Limbajul MATLAB este mult mai simplu de invatat daca se renunta la inspectarea arida a listelor cu variabile, functii si operatori si se utilizeaza in schimb comenzile help, helpdesk, demo tastate direct de la prompterul MATLAB.

Pentru aflarea tuturor informatiilor utile despre o comanda sau o functie se tasteaza help urmat de numele comenzii sau functiei respective.

Pachetul MATLAB dispune de asemenea de informatii complete despre utilizare sub forma unei documentatii tip .pdf.

In cazuri particulare se poate apela la INTERNET, existand o legatura la pagina Web a firmei producatoare.

Alte comenzi utile pentru aflarea de informatii sunt: helpwin, lookfor, help help.

Exemple sugestive de utilizare a comenzii help:

help sin

SIN Sine.

SIN(X) is the sine of the elements of X.

Overloaded methods

help sym/sin.m

help exp

EXP Exponential.

EXP(X) is the exponential of the elements of X, e

to the X.

For complex Z=X+i*Y, EXP(Z) =


See also LOG, LOG10, EXPM, EXPINT.

Overloaded methods

help sym/exp.m

help demtseries/exp.m

help plot

PLOT Linear plot.

PLOT(X,Y) plots vector Y versus vector X. If X or Y is a matrix, then the vector is plotted versus the rows or columns of the matrix, whichever line up. If X is a scalar and Y is a vector, length(Y) disconnected points are plotted.

PLOT(Y) plots the columns of Y versus their index. If Y is complex, PLOT(Y) is equivalent to PLOT(real(Y),imag(Y)). In all other uses of PLOT, the imaginary part is ignored.

Various line types, plot symbols and colors may be obtained with PLOT(X,Y,S) where S is a character string made from one element from any or all the following 3 colunms:

y yellow . point - solid

m magenta o circle : dotted

c cyan x x-mark -. dashdot

r red + plus -- dashed

g green * star

b blue s square

w white d diamond

k black v triangle (down)

^ triangle (up)

< triangle (left)

> triangle (right)

p pentagram

h hexagram

For example, PLOT(X,Y,'c+:') plots a cyan dotted line with a plus at each data point; PLOT(X,Y,'bd') plots blue diamond at each data point but does not draw any line.

PLOT(X1,Y1,S1,X2,Y2,S2,X3,Y3,S3,) combines the plots defined by the (X,Y,S) triples, where the X's and Y's are vectors or matrices and the S's are strings.

For example, PLOT(X,Y,'y-',X,Y,'go') plots the data twice, with a solid yellow line interpolating green circles at the data points.

The PLOT command, if no color is specified, makes automatic use of the colors specified by the axes ColorOrder property. The default ColorOrder is listed in the table above for color systems where the default is yellow for one line, and for multiple lines, to cycle through the first six colors in the table. For monochrome systems, PLOT cycles over the axes LineStyleOrder property.

PLOT returns a column vector of handles to LINE objects, one handle per line.

The X,Y pairs, or X,Y,S triples, can be followed by parameter/value pairs to specify additional properties of the lines.


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