Matlab thinks in vectors when plotting (x,y) data.
A single data set with linear scales
>> x = 0:0.1:10; y = sin(x); plot(x,y)
If only one argument is given to plot, the data is equally spaced.
>> plot(cos(x))
A single data set with red *'s marking the data
>> plot(x,y,'r*')
Multiple data sets
>> x = 0:0.1:10; plot(x,sin(x),x,cos(x))
Multiple data sets with different line styles
>> x = 0:0.1:10; plot(x,sin(x),'--',x,cos(x),'.-')
Logarithmic scales are also available. See also loglog and semilogx
>> x = 0:0.1:10; semilogy(x,exp(x))
Rescaling is easily accomplished with axis. Simply define a vector with the minimum and maximums of x and y.
>> x = 0:0.1:10; plot(x,sin(x),x,cos(x)) >> axis([0 2*pi -1 1])
Labeling is also easy. Enclose all labels in single quotes '
>> x = 0:0.1:10; plot(x,sin(x));
>> title('sine'), xlabel('x axis'), ylabel('y axis');
Cut and paste the following commands, then use left mouse click in the figure window to place the text 'sin(x)'
>> x = 0:0.1:10; plot(x,sin(x));
>> gtext('sin(x)')
In the following example, a surface plot of the radius is created.
>> [X,Y] = meshgrid(-1:0.1:1,-1:0.1:1); >> surf(sqrt(X.*X + Y.*Y))
A color plot without elevation can also be easily displayed.
>> pcolor(sqrt(X.*X + Y.*Y))
To smooth the coloring type
>> shading('interp')
And to remove the labeling
>> axis('off')
To save the current figure as a postscript file to print or import into another document, type
>> print -dps foo.ps
David Eyre