Graphics

Plotting

• Plots Y against X

Line Specification

Line style

'- '	 Solid line (default)  
'--'   Dashed line
':'	 Dotted line
'-.'	 Dash-dot line

Marker symbol

 '.'	 Point
 'x'	 Cross
 '+'	 Plus sign
 'o'	 Circle
 '*'	 Asterisk

 '^'	Upward-pointing triangle
 'v'	Downward-pointing triangle
 '>'	Right-pointing triangle
 '<'	Left-pointing triangle
 
'square' or 's'  Square
'diamond' or 'd'  Diamond
'pentagram' or 'p' Five-pointed star (pentagram)
'hexagram' or 'h'  Six-pointed star (hexagram)

Color

r	Red
g	Green
b	Blue
c	Cyan
m	Magenta
y	Yellow
k	Black
w	White

Plotting

    plot(x,y)
    plot(x,y, "r  *") // plot red * no line
    
    hold on      // plot on same Axis as before
    hold off     // plot on different axis
    
    clf       // clear figure
    close     // close figure
    
    figure(1): plot(x,y) // save a figure 
    
    subplot(n,m,o) // divide plot in nXm grid and access o element
    subplot(1,2,1) // divide plot in 1*2 grid and draw in first subplot
    
    plot(Vector)  // auto plot Vector on Y axis
    plot(x,y,"red--o", "LineWidth", 4)

Limit

    xlim([n,n])   // limit x range between n & m
    ylim([n,m])   // limit y range between n & m

Plot Matrix:

Color Plot

   A = magic(5)
   imagesc(A)   

Result:

Grey Scale Plot

 A = magic(5)
 imagesc(A), colorbar, colormap grey  

Result:

Legend:

    title('TITLE OF PLOT')   // Title
    axis([x1, x2, y,, y2])   // set axis range to x,. x2 & y1y2
    xlabel('X axis Label')   // X Label
    ylabel('Y axis Label')   // Y Label
    legend('plot1','plot2')  // Legend
    grid on                   // Grid enable

Example: FFT Plot

    plot(f, yfft)
    xlim([0,1000])
    title("Audio Range")
    xlabel("frequency")
    ylabel("fft")
    legend("fft")

Result:

Export Figure:

print -dpng  "<image name>.png"